Attachment 413788 Details for Bug 213822 – Patch

[patch] Patch

bug-213822-20201110234100.patch (text/plain), 254.78 KB, created by Yusuke Suzuki on 2020-11-10 23:41:01 PST

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Creator: Yusuke Suzuki

Created: 2020-11-10 23:41:01 PST

Size: 254.78 KB

patch

obsolete

>Subversion Revision: 269673
>diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
>index 820f14c13baee3d263693e2a06ea67725cb040c8..da1a166dba8f2c62dbb2882344c30985a2451e21 100644
>--- a/Source/JavaScriptCore/ChangeLog
>+++ b/Source/JavaScriptCore/ChangeLog
>@@ -1,3 +1,47 @@
>+2020-11-10  Yusuke Suzuki  <ysuzuki@apple.com>
>+
>+        [JSC] Implement Intl.DateTimeFormat.formatRangeToParts
>+        https://bugs.webkit.org/show_bug.cgi?id=213822
>+        <rdar://problem/69328711>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        This patch implements Intl.DateTimeFormat.formatRangeToParts. It is already stage-4 (included in the spec).
>+        The inputs are date interval, and this function generates array of parts of formatted string of date interval.
>+        Currently, required ICU APIs are draft status. So, for now, we track ABI changes, and use APIs with careful version checks.
>+
>+        However, currently, OpenSource macOS WebKit is built with specific ICU header (ICU 62 headers). So for now, we disable it
>+        in OpenSource macOS WebKit build. But we enable it for Apple Internal SDK WebKit build. We can enable it if we include
>+        multiple ICU header sets and select appropriate one against the linked ICU version. In the other platforms, they are using
>+        corresponding ICU headers so that we can just enable it.
>+
>+        There are two interesting implementation topics.
>+
>+        1. From ICU 67, the signature of udtitvfmt_formatToResult is changed. We need to switch the implementation with fine grained ICU version checks.
>+        2. udtitvfmt_formatToResult does not have an ability to configure gregorian calendar change date: before that date, the calendar is julian.
>+           In ECMAScript spec, we need to ignore this gregorian calendar change date, and we should handle all gregorian calendar dates as is even if
>+           the dates are older than gregorian calendar change date. However, since udtitvfmt_formatToResult does not offer the above ability,
>+           ICU automatically switches the calendar between gregorian and julian. To fix this issue, ICU 67 introduced udtitvfmt_formatCalendarToResult,
>+           which can take an explicit calendar for each input date so that we configure gregorian calendar change date. But this only exists after ICU 67.
>+           In the implementations using ICU 64-66, we just use udtitvfmt_formatToResult.
>+
>+        * JavaScriptCore.xcodeproj/project.pbxproj:
>+        * Sources.txt:
>+        * runtime/IntlDateTimeFormat.cpp:
>+        (JSC::UDateIntervalFormatDeleter::operator()):
>+        (JSC::IntlDateTimeFormat::formatToParts const):
>+        (JSC::definitelyAfterGregorianCalendarChangeDate):
>+        (JSC::formattedValueFromDateRange):
>+        (JSC::IntlDateTimeFormat::formatRange):
>+        (JSC::IntlDateTimeFormat::formatRangeToParts):
>+        * runtime/IntlDateTimeFormat.h:
>+        * runtime/IntlDateTimeFormatPrototype.cpp:
>+        (JSC::IntlDateTimeFormatPrototype::create):
>+        (JSC::IntlDateTimeFormatPrototype::finishCreation):
>+        (JSC::JSC_DEFINE_HOST_FUNCTION):
>+        * runtime/IntlDateTimeFormatPrototype.h:
>+        * runtime/OptionsList.h:
>+
> 2020-11-10  Commit Queue  <commit-queue@webkit.org>
> 
>         Unreviewed, reverting r269660.
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index c31cf0d1f99245d62ee056534df78ee1b567b57f..1a2dba54901b56360376a048324b83bed0d12d82 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,17 @@
>+2020-11-10  Yusuke Suzuki  <ysuzuki@apple.com>
>+
>+        [JSC] Implement Intl.DateTimeFormat.formatRangeToParts
>+        https://bugs.webkit.org/show_bug.cgi?id=213822
>+        <rdar://problem/69328711>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * wtf/MathExtras.h:
>+        (WTF::nonEmptyRangesSubsume):
>+        (WTF::rangesSubsume):
>+        * wtf/Range.h:
>+        (WTF::Range::subsumes const):
>+
> 2020-11-10  Commit Queue  <commit-queue@webkit.org>
> 
>         Unreviewed, reverting r269660.
>diff --git a/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj b/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>index 0498054769e922ffcae3187c55b28ac9ca52c2c0..c0eef0bc30e02cd876c9312d71ed6e0127d3e458 100644
>--- a/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>+++ b/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>@@ -1865,6 +1865,7 @@
> 		E392E6F824D25FA600B20767 /* B3BottomTupleValue.cpp in Sources */ = {isa = PBXBuildFile; fileRef = E392E6F624D25FA600B20767 /* B3BottomTupleValue.cpp */; };
> 		E392E6F924D25FA900B20767 /* B3BottomTupleValue.h in Headers */ = {isa = PBXBuildFile; fileRef = E392E6F724D25FA600B20767 /* B3BottomTupleValue.h */; };
> 		E393ADD81FE702D00022D681 /* WeakMapImplInlines.h in Headers */ = {isa = PBXBuildFile; fileRef = E393ADD71FE702CC0022D681 /* WeakMapImplInlines.h */; };
>+		E399AEC32559457F00B78485 /* IntlDateTimeFormat.cpp in Sources */ = {isa = PBXBuildFile; fileRef = A1587D671B4DC14100D69849 /* IntlDateTimeFormat.cpp */; };
> 		E39BF39922A2288B00BD183E /* SymbolTableInlines.h in Headers */ = {isa = PBXBuildFile; fileRef = E39BF39822A2288B00BD183E /* SymbolTableInlines.h */; };
> 		E39D45F51D39005600B3B377 /* InterpreterInlines.h in Headers */ = {isa = PBXBuildFile; fileRef = E39D9D841D39000600667282 /* InterpreterInlines.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		E39D8B2E23021E2600265852 /* WasmOperations.h in Headers */ = {isa = PBXBuildFile; fileRef = E39D8B2D23021E1E00265852 /* WasmOperations.h */; };
>@@ -11392,6 +11393,7 @@
> 				5333BBDD2110F7E1007618EC /* DFGSpeculativeJIT64.cpp in Sources */,
> 				33B2A548226543BF005A0F79 /* FTLLowerDFGToB3.cpp in Sources */,
> 				5C4196622270E0000047B7CD /* InspectorBackendDispatcherCompatibility.cpp in Sources */,
>+				E399AEC32559457F00B78485 /* IntlDateTimeFormat.cpp in Sources */,
> 				E366441E254409B30001876F /* IntlListFormat.cpp in Sources */,
> 				E38E8790254B978400F6F9E4 /* JSDateMath.cpp in Sources */,
> 				536B319E1F735F160037FC33 /* LowLevelInterpreter.cpp in Sources */,
>diff --git a/Source/JavaScriptCore/Sources.txt b/Source/JavaScriptCore/Sources.txt
>index f62d9437b0d35f12decc7f74acb77e2373a7d71a..f97fb0e958400dbc1f294dbfc2be52aaceffcc58 100644
>--- a/Source/JavaScriptCore/Sources.txt
>+++ b/Source/JavaScriptCore/Sources.txt
>@@ -813,14 +813,13 @@ runtime/IntlCache.cpp
> runtime/IntlCollator.cpp
> runtime/IntlCollatorConstructor.cpp
> runtime/IntlCollatorPrototype.cpp
>-runtime/IntlDateTimeFormat.cpp
>+runtime/IntlDateTimeFormat.cpp @no-unify // Confine U_HIDE_DRAFT_API's effect to this file.
> runtime/IntlDateTimeFormatConstructor.cpp
> runtime/IntlDateTimeFormatPrototype.cpp
> runtime/IntlDisplayNames.cpp
> runtime/IntlDisplayNamesConstructor.cpp
> runtime/IntlDisplayNamesPrototype.cpp
>-// Confine U_HIDE_DRAFT_API's effect in this file.
>-runtime/IntlListFormat.cpp @no-unify
>+runtime/IntlListFormat.cpp @no-unify // Confine U_HIDE_DRAFT_API's effect in this file.
> runtime/IntlListFormatConstructor.cpp
> runtime/IntlListFormatPrototype.cpp
> runtime/IntlLocale.cpp
>diff --git a/Source/JavaScriptCore/runtime/IntlDateTimeFormat.cpp b/Source/JavaScriptCore/runtime/IntlDateTimeFormat.cpp
>index 62717482a7a5ebb6b172a4f831e422c6ef5b1d1f..2dc9f98f166f5aafe89a508c38685619efe55530 100644
>--- a/Source/JavaScriptCore/runtime/IntlDateTimeFormat.cpp
>+++ b/Source/JavaScriptCore/runtime/IntlDateTimeFormat.cpp
>@@ -34,12 +34,32 @@
> #include "ObjectConstructor.h"
> #include <unicode/ucal.h>
> #include <unicode/uenum.h>
>+#include <wtf/Range.h>
> #include <wtf/text/StringBuilder.h>
> #include <wtf/unicode/icu/ICUHelpers.h>
> 
>+#if HAVE(ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS)
>+#include <unicode/uformattedvalue.h>
>+#ifdef U_HIDE_DRAFT_API
>+#undef U_HIDE_DRAFT_API
>+#endif
>+#endif // HAVE(ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS)
>+#include <unicode/udateintervalformat.h>
>+#if HAVE(ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS)
>+#define U_HIDE_DRAFT_API 1
>+#endif // HAVE(ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS)
>+
> namespace JSC {
> 
>-static const double minECMAScriptTime = -8.64E15;
>+// We do not use ICUDeleter<udtitvfmt_close> because we do not want to include udateintervalformat.h in IntlDateTimeFormat.h.
>+// udateintervalformat.h needs to be included with #undef U_HIDE_DRAFT_API, and we would like to minimize this effect in IntlDateTimeFormat.cpp.
>+void UDateIntervalFormatDeleter::operator()(UDateIntervalFormat* formatter)
>+{
>+    if (formatter)
>+        udtitvfmt_close(formatter);
>+}
>+
>+static constexpr double minECMAScriptTime = -8.64E15;
> 
> const ClassInfo IntlDateTimeFormat::s_info = { "Object", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(IntlDateTimeFormat) };
> 
>@@ -1248,7 +1268,7 @@ static ASCIILiteral partTypeString(UDateFormatField field)
> }
> 
> // https://tc39.es/ecma402/#sec-formatdatetimetoparts
>-JSValue IntlDateTimeFormat::formatToParts(JSGlobalObject* globalObject, double value) const
>+JSValue IntlDateTimeFormat::formatToParts(JSGlobalObject* globalObject, double value, JSString* sourceType) const
> {
>     ASSERT(m_dateFormat);
> 
>@@ -1289,6 +1309,8 @@ JSValue IntlDateTimeFormat::formatToParts(JSGlobalObject* globalObject, double v
>             JSObject* part = constructEmptyObject(globalObject);
>             part->putDirect(vm, vm.propertyNames->type, literalString);
>             part->putDirect(vm, vm.propertyNames->value, value);
>+            if (sourceType)
>+                part->putDirect(vm, vm.propertyNames->source, sourceType);
>             parts->push(globalObject, part);
>             RETURN_IF_EXCEPTION(scope, { });
>         }
>@@ -1300,12 +1322,13 @@ JSValue IntlDateTimeFormat::formatToParts(JSGlobalObject* globalObject, double v
>             JSObject* part = constructEmptyObject(globalObject);
>             part->putDirect(vm, vm.propertyNames->type, type);
>             part->putDirect(vm, vm.propertyNames->value, value);
>+            if (sourceType)
>+                part->putDirect(vm, vm.propertyNames->source, sourceType);
>             parts->push(globalObject, part);
>             RETURN_IF_EXCEPTION(scope, { });
>         }
>     }
> 
>-
>     return parts;
> }
> 
>@@ -1357,6 +1380,71 @@ UDateIntervalFormat* IntlDateTimeFormat::createDateIntervalFormatIfNecessary(JSG
>     return m_dateIntervalFormat.get();
> }
> 
>+#if HAVE(ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS)
>+
>+// If a date is after Oct 15, 1582, the configuration of gregorian calendar change date in UCalendar does not affect
>+// on the formatted string. To ensure that it is after Oct 15 in all timezones, we add one day to gregorian calendar
>+// change date in UTC, so that this check can conservatively answer whether the date is definitely after gregorian
>+// calendar change date.
>+static inline bool definitelyAfterGregorianCalendarChangeDate(double millisecondsFromEpoch)
>+{
>+    constexpr double gregorianCalendarReformDateInUTC = -12219292800000.0;
>+    return millisecondsFromEpoch >= (gregorianCalendarReformDateInUTC + msPerDay);
>+}
>+
>+static std::unique_ptr<UFormattedDateInterval, ICUDeleter<udtitvfmt_closeResult>> formattedValueFromDateRange(UDateIntervalFormat& dateIntervalFormat, UDateFormat& dateFormat, double startDate, double endDate, UErrorCode& status)
>+{
>+    auto result = std::unique_ptr<UFormattedDateInterval, ICUDeleter<udtitvfmt_closeResult>>(udtitvfmt_openResult(&status));
>+    if (U_FAILURE(status))
>+        return nullptr;
>+
>+    // After ICU 67, udtitvfmt_formatToResult's signature is changed.
>+#if U_ICU_VERSION_MAJOR_NUM >= 67
>+    // UFormattedDateInterval does not have a way to configure gregorian calendar change date while ECMAScript requires that
>+    // gregorian calendar change should not have effect (we are setting ucal_setGregorianChange(cal, minECMAScriptTime, &status) explicitly).
>+    // As a result, if the input date is older than gregorian calendar change date (Oct 15, 1582), the formatted string becomes
>+    // julian calendar date.
>+    // udtitvfmt_formatCalendarToResult API offers the way to set calendar to each date of the input, so that we can use UDateFormat's
>+    // calendar which is already configured to meet ECMAScript's requirement (effectively clearing gregorian calendar change date).
>+    //
>+    // If we can ensure that startDate is after gregorian calendar change date, we can just use udtitvfmt_formatToResult since gregorian
>+    // calendar change date does not affect on the formatted string.
>+    //
>+    // https://unicode-org.atlassian.net/browse/ICU-20705
>+    if (definitelyAfterGregorianCalendarChangeDate(startDate))
>+        udtitvfmt_formatToResult(&dateIntervalFormat, startDate, endDate, result.get(), &status);
>+    else {
>+        auto createCalendarForDate = [](const UCalendar* calendar, double date, UErrorCode& status) -> std::unique_ptr<UCalendar, ICUDeleter<ucal_close>> {
>+            auto result = std::unique_ptr<UCalendar, ICUDeleter<ucal_close>>(ucal_clone(calendar, &status));
>+            if (U_FAILURE(status))
>+                return nullptr;
>+            ucal_setMillis(result.get(), date, &status);
>+            if (U_FAILURE(status))
>+                return nullptr;
>+            return result;
>+        };
>+
>+        auto calendar = udat_getCalendar(&dateFormat);
>+
>+        auto startCalendar = createCalendarForDate(calendar, startDate, status);
>+        if (U_FAILURE(status))
>+            return nullptr;
>+
>+        auto endCalendar = createCalendarForDate(calendar, endDate, status);
>+        if (U_FAILURE(status))
>+            return nullptr;
>+
>+        udtitvfmt_formatCalendarToResult(&dateIntervalFormat, startCalendar.get(), endCalendar.get(), result.get(), &status);
>+    }
>+#else
>+    UNUSED_PARAM(dateFormat);
>+    udtitvfmt_formatToResult(&dateIntervalFormat, result.get(), startDate, endDate, &status);
>+#endif
>+    return result;
>+}
>+
>+#endif // HAVE(ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS)
>+
> JSValue IntlDateTimeFormat::formatRange(JSGlobalObject* globalObject, double startDate, double endDate)
> {
>     ASSERT(m_dateFormat);
>@@ -1375,6 +1463,36 @@ JSValue IntlDateTimeFormat::formatRange(JSGlobalObject* globalObject, double sta
>     auto* dateIntervalFormat = createDateIntervalFormatIfNecessary(globalObject);
>     RETURN_IF_EXCEPTION(scope, { });
> 
>+#if HAVE(ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS)
>+    // If the date is older than gregorian calendar change date, we need to explicitly pass configured UCalendar to
>+    // udtitvfmt_formatCalendarToResult to generate a correct formatted string.
>+    // The comment in formattedValueFromDateRange describes the details.
>+    if (!definitelyAfterGregorianCalendarChangeDate(startDate)) {
>+        UErrorCode status = U_ZERO_ERROR;
>+        auto result = formattedValueFromDateRange(*dateIntervalFormat, *m_dateFormat, startDate, endDate, status);
>+        if (U_FAILURE(status)) {
>+            throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+            return { };
>+        }
>+
>+        // UFormattedValue is owned by UFormattedDateInterval. We do not need to close it.
>+        auto formattedValue = udtitvfmt_resultAsValue(result.get(), &status);
>+        if (U_FAILURE(status)) {
>+            throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+            return { };
>+        }
>+
>+        int32_t formattedStringLength = 0;
>+        const UChar* formattedStringPointer = ufmtval_getString(formattedValue, &formattedStringLength, &status);
>+        if (U_FAILURE(status)) {
>+            throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+            return { };
>+        }
>+
>+        return jsString(vm, String(formattedStringPointer, formattedStringLength));
>+    }
>+#endif
>+
>     Vector<UChar, 32> buffer;
>     auto status = callBufferProducingFunction(udtitvfmt_format, dateIntervalFormat, startDate, endDate, buffer, nullptr);
>     if (U_FAILURE(status)) {
>@@ -1385,4 +1503,240 @@ JSValue IntlDateTimeFormat::formatRange(JSGlobalObject* globalObject, double sta
>     return jsString(vm, String(buffer));
> }
> 
>+JSValue IntlDateTimeFormat::formatRangeToParts(JSGlobalObject* globalObject, double startDate, double endDate)
>+{
>+    ASSERT(m_dateFormat);
>+
>+    VM& vm = globalObject->vm();
>+    auto scope = DECLARE_THROW_SCOPE(vm);
>+
>+#if HAVE(ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS)
>+    // http://tc39.es/proposal-intl-DateTimeFormat-formatRange/#sec-partitiondatetimerangepattern
>+    startDate = timeClip(startDate);
>+    endDate = timeClip(endDate);
>+    if (std::isnan(startDate) || std::isnan(endDate)) {
>+        throwRangeError(globalObject, scope, "Passed date is out of range"_s);
>+        return { };
>+    }
>+
>+    auto* dateIntervalFormat = createDateIntervalFormatIfNecessary(globalObject);
>+    RETURN_IF_EXCEPTION(scope, { });
>+
>+    auto dateFieldsPracticallyEqual = [](const UFormattedValue* formattedValue, UErrorCode& status) {
>+        auto iterator = std::unique_ptr<UConstrainedFieldPosition, ICUDeleter<ucfpos_close>>(ucfpos_open(&status));
>+        if (U_FAILURE(status))
>+            return false;
>+
>+        // We only care about UFIELD_CATEGORY_DATE_INTERVAL_SPAN category.
>+        ucfpos_constrainCategory(iterator.get(), UFIELD_CATEGORY_DATE_INTERVAL_SPAN, &status);
>+        if (U_FAILURE(status))
>+            return false;
>+
>+        bool hasSpan = ufmtval_nextPosition(formattedValue, iterator.get(), &status);
>+        if (U_FAILURE(status))
>+            return false;
>+
>+        return !hasSpan;
>+    };
>+
>+    UErrorCode status = U_ZERO_ERROR;
>+    auto result = formattedValueFromDateRange(*dateIntervalFormat, *m_dateFormat, startDate, endDate, status);
>+    if (U_FAILURE(status)) {
>+        throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+        return { };
>+    }
>+
>+    // UFormattedValue is owned by UFormattedDateInterval. We do not need to close it.
>+    auto formattedValue = udtitvfmt_resultAsValue(result.get(), &status);
>+    if (U_FAILURE(status)) {
>+        throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+        return { };
>+    }
>+
>+    auto sharedString = jsNontrivialString(vm, "shared"_s);
>+
>+    // If the formatted parts of startDate and endDate are the same, it is possible that the resulted string does not look like range.
>+    // For example, if the requested format only includes "year" and startDate and endDate are the same year, the result just contains one year.
>+    // In that case, startDate and endDate are *practically-equal* (spec term), and we generate parts as we call `formatToParts(startDate)` with
>+    // `source: "shared"` additional fields.
>+    bool equal = dateFieldsPracticallyEqual(formattedValue, status);
>+    if (U_FAILURE(status)) {
>+        throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+        return { };
>+    }
>+
>+    if (equal)
>+        RELEASE_AND_RETURN(scope, formatToParts(globalObject, startDate, sharedString));
>+
>+    // ICU produces ranges for the formatted string, and we construct parts array from that.
>+    // For example, startDate = Jan 3, 2019, endDate = Jan 5, 2019 with en-US locale is,
>+    //
>+    // Formatted string: "1/3/2019âââ1/5/2019"
>+    //                    | | |  |   | | |  |
>+    //                    B C |  |   F G |  |
>+    //                    |   +-D+   |   +-H+
>+    //                    |      |   |      |
>+    //                    +--A---+   +--E---+
>+    //
>+    // Ranges ICU generates:
>+    //     A:    (0, 8)   UFIELD_CATEGORY_DATE_INTERVAL_SPAN startRange
>+    //     B:    (0, 1)   UFIELD_CATEGORY_DATE month
>+    //     C:    (2, 3)   UFIELD_CATEGORY_DATE day
>+    //     D:    (4, 8)   UFIELD_CATEGORY_DATE year
>+    //     E:    (11, 19) UFIELD_CATEGORY_DATE_INTERVAL_SPAN endRange
>+    //     F:    (11, 12) UFIELD_CATEGORY_DATE month
>+    //     G:    (13, 14) UFIELD_CATEGORY_DATE day
>+    //     H:    (15, 19) UFIELD_CATEGORY_DATE year
>+    //
>+    //  We use UFIELD_CATEGORY_DATE_INTERVAL_SPAN range to determine each part is either "startRange", "endRange", or "shared".
>+    //  It is gurarnteed that UFIELD_CATEGORY_DATE_INTERVAL_SPAN comes first before any other parts including that range.
>+    //  For example, in the above formatted string, "âââ" is "shared" part. For UFIELD_CATEGORY_DATE ranges, we generate corresponding
>+    //  part object with types such as "month". And non populated parts (e.g. "/") become "literal" parts.
>+    //  In the above case, expected parts are,
>+    //
>+    //     { type: "month", value: "1", source: "startRange" },
>+    //     { type: "literal", value: "/", source: "startRange" },
>+    //     { type: "day", value: "3", source: "startRange" },
>+    //     { type: "literal", value: "/", source: "startRange" },
>+    //     { type: "year", value: "2019", source: "startRange" },
>+    //     { type: "literal", value: " - ", source: "shared" },
>+    //     { type: "month", value: "1", source: "endRange" },
>+    //     { type: "literal", value: "/", source: "endRange" },
>+    //     { type: "day", value: "5", source: "endRange" },
>+    //     { type: "literal", value: "/", source: "endRange" },
>+    //     { type: "year", value: "2019", source: "endRange" },
>+    //
>+
>+    JSArray* parts = JSArray::tryCreate(vm, globalObject->arrayStructureForIndexingTypeDuringAllocation(ArrayWithContiguous), 0);
>+    if (!parts) {
>+        throwOutOfMemoryError(globalObject, scope);
>+        return { };
>+    }
>+
>+    int32_t formattedStringLength = 0;
>+    const UChar* formattedStringPointer = ufmtval_getString(formattedValue, &formattedStringLength, &status);
>+    if (U_FAILURE(status)) {
>+        throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+        return { };
>+    }
>+    String resultString(formattedStringPointer, formattedStringLength);
>+
>+    // We care multiple categories (UFIELD_CATEGORY_DATE and UFIELD_CATEGORY_DATE_INTERVAL_SPAN).
>+    // So we do not constraint iterator.
>+    auto iterator = std::unique_ptr<UConstrainedFieldPosition, ICUDeleter<ucfpos_close>>(ucfpos_open(&status));
>+    if (U_FAILURE(status)) {
>+        throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+        return { };
>+    }
>+
>+    auto startRangeString = jsNontrivialString(vm, "startRange"_s);
>+    auto endRangeString = jsNontrivialString(vm, "endRange"_s);
>+    auto literalString = jsNontrivialString(vm, "literal"_s);
>+
>+    auto createPart = [&] (JSString* type, JSString* value, JSString* sourceType) {
>+        JSObject* part = constructEmptyObject(globalObject);
>+        part->putDirect(vm, vm.propertyNames->type, type);
>+        part->putDirect(vm, vm.propertyNames->value, value);
>+        part->putDirect(vm, vm.propertyNames->source, sourceType);
>+        return part;
>+    };
>+
>+    WTF::Range<int32_t> startRange { -1, -1 };
>+    WTF::Range<int32_t> endRange { -1, -1 };
>+
>+    auto sourceType = [&](int32_t index) -> JSString* {
>+        if (startRange.contains(index))
>+            return startRangeString;
>+        if (endRange.contains(index))
>+            return endRangeString;
>+        return sharedString;
>+    };
>+
>+    int32_t resultLength = resultString.length();
>+    int32_t previousEndIndex = 0;
>+    while (true) {
>+        bool next = ufmtval_nextPosition(formattedValue, iterator.get(), &status);
>+        if (U_FAILURE(status)) {
>+            throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+            return { };
>+        }
>+        if (!next)
>+            break;
>+
>+        int32_t category = ucfpos_getCategory(iterator.get(), &status);
>+        if (U_FAILURE(status)) {
>+            throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+            return { };
>+        }
>+
>+        int32_t fieldType = ucfpos_getField(iterator.get(), &status);
>+        if (U_FAILURE(status)) {
>+            throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+            return { };
>+        }
>+
>+        int32_t beginIndex = 0;
>+        int32_t endIndex = 0;
>+        ucfpos_getIndexes(iterator.get(), &beginIndex, &endIndex, &status);
>+        if (U_FAILURE(status)) {
>+            throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+            return { };
>+        }
>+
>+        dataLogLnIf(IntlDateTimeFormatInternal::verbose, category, " ", fieldType, " (", beginIndex, ", ", endIndex, ")");
>+
>+        if (category != UFIELD_CATEGORY_DATE && category != UFIELD_CATEGORY_DATE_INTERVAL_SPAN)
>+            continue;
>+        if (category == UFIELD_CATEGORY_DATE && fieldType < 0)
>+            continue;
>+
>+        if (previousEndIndex < beginIndex) {
>+            auto value = jsString(vm, resultString.substring(previousEndIndex, beginIndex - previousEndIndex));
>+            JSObject* part = createPart(literalString, value, sourceType(previousEndIndex));
>+            parts->push(globalObject, part);
>+            RETURN_IF_EXCEPTION(scope, { });
>+            previousEndIndex = beginIndex;
>+        }
>+
>+        if (category == UFIELD_CATEGORY_DATE_INTERVAL_SPAN) {
>+            // > The special field category UFIELD_CATEGORY_DATE_INTERVAL_SPAN is used to indicate which datetime
>+            // > primitives came from which arguments: 0 means fromCalendar, and 1 means toCalendar. The span category
>+            // > will always occur before the corresponding fields in UFIELD_CATEGORY_DATE in the nextPosition() iterator.
>+            // from ICU comment. So, field 0 is startRange, field 1 is endRange.
>+            if (!fieldType)
>+                startRange = WTF::Range<int32_t>(beginIndex, endIndex);
>+            else {
>+                ASSERT(fieldType == 1);
>+                endRange = WTF::Range<int32_t>(beginIndex, endIndex);
>+            }
>+            continue;
>+        }
>+
>+        ASSERT(category == UFIELD_CATEGORY_DATE);
>+
>+        auto type = jsString(vm, partTypeString(UDateFormatField(fieldType)));
>+        auto value = jsString(vm, resultString.substring(beginIndex, endIndex - beginIndex));
>+        JSObject* part = createPart(type, value, sourceType(beginIndex));
>+        parts->push(globalObject, part);
>+        RETURN_IF_EXCEPTION(scope, { });
>+        previousEndIndex = endIndex;
>+    }
>+
>+    if (previousEndIndex < resultLength) {
>+        auto value = jsString(vm, resultString.substring(previousEndIndex, resultLength - previousEndIndex));
>+        JSObject* part = createPart(literalString, value, sourceType(previousEndIndex));
>+        parts->push(globalObject, part);
>+        RETURN_IF_EXCEPTION(scope, { });
>+    }
>+
>+    return parts;
>+#else
>+    UNUSED_PARAM(startDate);
>+    UNUSED_PARAM(endDate);
>+    throwTypeError(globalObject, scope, "Failed to format date interval"_s);
>+    return { };
>+#endif
>+}
>+
>+
> } // namespace JSC
>diff --git a/Source/JavaScriptCore/runtime/IntlDateTimeFormat.h b/Source/JavaScriptCore/runtime/IntlDateTimeFormat.h
>index 53049120791a37ca834112b12f2f2f836b103c3e..e17a642eceee834e442e5af8224b6bde81e5da92 100644
>--- a/Source/JavaScriptCore/runtime/IntlDateTimeFormat.h
>+++ b/Source/JavaScriptCore/runtime/IntlDateTimeFormat.h
>@@ -27,15 +27,27 @@
> 
> #include "JSObject.h"
> #include <unicode/udat.h>
>-#include <unicode/udateintervalformat.h>
> #include <wtf/unicode/icu/ICUHelpers.h>
> 
>+struct UDateIntervalFormat;
>+
>+#if !defined(HAVE_ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS)
>+// ICU header is up-to-date if the build is non-Darwin or using Apple Internal SDK.
>+#if (USE(APPLE_INTERNAL_SDK) || !OS(DARWIN)) && U_ICU_VERSION_MAJOR_NUM >= 64
>+#define HAVE_ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS 1
>+#endif
>+#endif
>+
> namespace JSC {
> 
> enum class RelevantExtensionKey : uint8_t;
> 
> class JSBoundFunction;
> 
>+struct UDateIntervalFormatDeleter {
>+    JS_EXPORT_PRIVATE void operator()(UDateIntervalFormat*);
>+};
>+
> class IntlDateTimeFormat final : public JSNonFinalObject {
> public:
>     using Base = JSNonFinalObject;
>@@ -60,8 +72,9 @@ class IntlDateTimeFormat final : public JSNonFinalObject {
> 
>     void initializeDateTimeFormat(JSGlobalObject*, JSValue locales, JSValue options);
>     JSValue format(JSGlobalObject*, double value) const;
>-    JSValue formatToParts(JSGlobalObject*, double value) const;
>+    JSValue formatToParts(JSGlobalObject*, double value, JSString* sourceType = nullptr) const;
>     JSValue formatRange(JSGlobalObject*, double startDate, double endDate);
>+    JSValue formatRangeToParts(JSGlobalObject*, double startDate, double endDate);
>     JSObject* resolvedOptions(JSGlobalObject*) const;
> 
>     JSBoundFunction* boundFormat() const { return m_boundFormat.get(); }
>@@ -112,7 +125,6 @@ class IntlDateTimeFormat final : public JSNonFinalObject {
>     static void replaceHourCycleInPattern(Vector<UChar, 32>&, HourCycle);
> 
>     using UDateFormatDeleter = ICUDeleter<udat_close>;
>-    using UDateIntervalFormatDeleter = ICUDeleter<udtitvfmt_close>;
> 
>     WriteBarrier<JSBoundFunction> m_boundFormat;
>     std::unique_ptr<UDateFormat, UDateFormatDeleter> m_dateFormat;
>diff --git a/Source/JavaScriptCore/runtime/IntlDateTimeFormatPrototype.cpp b/Source/JavaScriptCore/runtime/IntlDateTimeFormatPrototype.cpp
>index 333bfdd55da2bde5ccfed8e048a833907b8515ff..738c8c64bb2fb6b64c00eb726c8356d5b1ca5967 100644
>--- a/Source/JavaScriptCore/runtime/IntlDateTimeFormatPrototype.cpp
>+++ b/Source/JavaScriptCore/runtime/IntlDateTimeFormatPrototype.cpp
>@@ -38,6 +38,7 @@ namespace JSC {
> 
> static JSC_DECLARE_HOST_FUNCTION(IntlDateTimeFormatPrototypeGetterFormat);
> static JSC_DECLARE_HOST_FUNCTION(IntlDateTimeFormatPrototypeFuncFormatRange);
>+static JSC_DECLARE_HOST_FUNCTION(IntlDateTimeFormatPrototypeFuncFormatRangeToParts);
> static JSC_DECLARE_HOST_FUNCTION(IntlDateTimeFormatPrototypeFuncFormatToParts);
> static JSC_DECLARE_HOST_FUNCTION(IntlDateTimeFormatPrototypeFuncResolvedOptions);
> static JSC_DECLARE_HOST_FUNCTION(IntlDateTimeFormatFuncFormatDateTime);
>@@ -59,10 +60,10 @@ const ClassInfo IntlDateTimeFormatPrototype::s_info = { "Intl.DateTimeFormat", &
> @end
> */
> 
>-IntlDateTimeFormatPrototype* IntlDateTimeFormatPrototype::create(VM& vm, JSGlobalObject*, Structure* structure)
>+IntlDateTimeFormatPrototype* IntlDateTimeFormatPrototype::create(VM& vm, JSGlobalObject* globalObject, Structure* structure)
> {
>     IntlDateTimeFormatPrototype* object = new (NotNull, allocateCell<IntlDateTimeFormatPrototype>(vm.heap)) IntlDateTimeFormatPrototype(vm, structure);
>-    object->finishCreation(vm);
>+    object->finishCreation(vm, globalObject);
>     return object;
> }
> 
>@@ -76,10 +77,17 @@ IntlDateTimeFormatPrototype::IntlDateTimeFormatPrototype(VM& vm, Structure* stru
> {
> }
> 
>-void IntlDateTimeFormatPrototype::finishCreation(VM& vm)
>+void IntlDateTimeFormatPrototype::finishCreation(VM& vm, JSGlobalObject* globalObject)
> {
>     Base::finishCreation(vm);
>     ASSERT(inherits(vm, info()));
>+#if HAVE(ICU_U_DATE_INTERVAL_FORMAT_FORMAT_RANGE_TO_PARTS)
>+    if (Options::useIntlDateTimeFormatRangeToParts())
>+        JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION("formatRangeToParts", IntlDateTimeFormatPrototypeFuncFormatRangeToParts, static_cast<unsigned>(PropertyAttribute::DontEnum), 2);
>+#else
>+    UNUSED_PARAM(globalObject);
>+    UNUSED_PARAM(&IntlDateTimeFormatPrototypeFuncFormatRangeToParts);
>+#endif
>     JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
> }
> 
>@@ -188,6 +196,33 @@ JSC_DEFINE_HOST_FUNCTION(IntlDateTimeFormatPrototypeFuncFormatRange, (JSGlobalOb
>     RELEASE_AND_RETURN(scope, JSValue::encode(dateTimeFormat->formatRange(globalObject, startDate, endDate)));
> }
> 
>+// http://tc39.es/proposal-intl-DateTimeFormat-formatRange/#sec-intl.datetimeformat.prototype.formatRangeToParts
>+JSC_DEFINE_HOST_FUNCTION(IntlDateTimeFormatPrototypeFuncFormatRangeToParts, (JSGlobalObject* globalObject, CallFrame* callFrame))
>+{
>+    VM& vm = globalObject->vm();
>+    auto scope = DECLARE_THROW_SCOPE(vm);
>+
>+    // Do not use unwrapForOldFunctions.
>+    auto* dateTimeFormat = jsDynamicCast<IntlDateTimeFormat*>(vm, callFrame->thisValue());
>+    if (UNLIKELY(!dateTimeFormat))
>+        return JSValue::encode(throwTypeError(globalObject, scope, "Intl.DateTimeFormat.prototype.formatRangeToParts called on value that's not an object initialized as a DateTimeFormat"_s));
>+
>+    JSValue startDateValue = callFrame->argument(0);
>+    JSValue endDateValue = callFrame->argument(1);
>+
>+    if (startDateValue.isUndefined() || endDateValue.isUndefined())
>+        return throwVMTypeError(globalObject, scope, "startDate or endDate is undefined"_s);
>+
>+    double startDate = startDateValue.toNumber(globalObject);
>+    RETURN_IF_EXCEPTION(scope, { });
>+    double endDate = endDateValue.toNumber(globalObject);
>+    RETURN_IF_EXCEPTION(scope, { });
>+    if (startDate > endDate)
>+        return throwVMRangeError(globalObject, scope, "startDate is larger than endDate"_s);
>+
>+    RELEASE_AND_RETURN(scope, JSValue::encode(dateTimeFormat->formatRangeToParts(globalObject, startDate, endDate)));
>+}
>+
> JSC_DEFINE_HOST_FUNCTION(IntlDateTimeFormatPrototypeFuncResolvedOptions, (JSGlobalObject* globalObject, CallFrame* callFrame))
> {
>     VM& vm = globalObject->vm();
>diff --git a/Source/JavaScriptCore/runtime/IntlDateTimeFormatPrototype.h b/Source/JavaScriptCore/runtime/IntlDateTimeFormatPrototype.h
>index df12d4346a5dfb89fbca843ed12e7052a9756cfd..82f4ca29f47e703d58a02612f533494eb979a25d 100644
>--- a/Source/JavaScriptCore/runtime/IntlDateTimeFormatPrototype.h
>+++ b/Source/JavaScriptCore/runtime/IntlDateTimeFormatPrototype.h
>@@ -49,7 +49,7 @@ class IntlDateTimeFormatPrototype final : public JSNonFinalObject {
> 
> private:
>     IntlDateTimeFormatPrototype(VM&, Structure*);
>-    void finishCreation(VM&);
>+    void finishCreation(VM&, JSGlobalObject*);
> };
> 
> } // namespace JSC
>diff --git a/Source/JavaScriptCore/runtime/OptionsList.h b/Source/JavaScriptCore/runtime/OptionsList.h
>index f84deec1c26d52cf7331904a201d8e84d5a34a5b..a103ef8c13e3263bfd853ef01637e01ba88460fc 100644
>--- a/Source/JavaScriptCore/runtime/OptionsList.h
>+++ b/Source/JavaScriptCore/runtime/OptionsList.h
>@@ -493,6 +493,7 @@ JS_EXPORT_PRIVATE bool canUseJITCage();
>     v(Bool, useWebAssemblyMultiValues, true, Normal, "Allow types from the wasm mulit-values spec.") \
>     v(Bool, useWeakRefs, true, Normal, "Expose the WeakRef constructor.") \
>     v(Bool, useIntlDateTimeFormatDayPeriod, true, Normal, "Expose the Intl.DateTimeFormat dayPeriod feature.") \
>+    v(Bool, useIntlDateTimeFormatRangeToParts, true, Normal, "Expose the Intl.DateTimeFormat#formatRangeToParts feature.") \
>     v(Bool, useAtMethod, false, Normal, "Expose the at() method on Array and %TypedArray%.") \
>     v(Bool, useSharedArrayBuffer, false, Normal, nullptr) \
>     v(Bool, useArrayAllocationProfiling, true, Normal, "If true, we will use our normal array allocation profiling. If false, the allocation profile will always claim to be undecided.") \
>diff --git a/Source/WTF/wtf/MathExtras.h b/Source/WTF/wtf/MathExtras.h
>index cf115ef36a681d6eb1e123a7114a5405e95fa607..5149e2ad93c9d3903d104481270aa59ec1a5f6cd 100644
>--- a/Source/WTF/wtf/MathExtras.h
>+++ b/Source/WTF/wtf/MathExtras.h
>@@ -595,6 +595,30 @@ inline bool rangesOverlap(T leftMin, T leftMax, T rightMin, T rightMax)
>     return nonEmptyRangesOverlap(leftMin, leftMax, rightMin, rightMax);
> }
> 
>+template<typename T>
>+inline bool nonEmptyRangesSubsume(T leftMin, T leftMax, T rightMin, T rightMax)
>+{
>+    ASSERT(leftMin < leftMax);
>+    ASSERT(rightMin < rightMax);
>+
>+    return leftMin <= rightMin && rightMax <= leftMax;
>+}
>+
>+template<typename T>
>+inline bool rangesSubsume(T leftMin, T leftMax, T rightMin, T rightMax)
>+{
>+    ASSERT(leftMin <= leftMax);
>+    ASSERT(rightMin <= rightMax);
>+
>+    // Empty ranges interfere with nothing.
>+    if (leftMin == leftMax)
>+        return false;
>+    if (rightMin == rightMax)
>+        return false;
>+
>+    return nonEmptyRangesSubsume(leftMin, leftMax, rightMin, rightMax);
>+}
>+
> template<typename VectorType, typename RandomFunc>
> void shuffleVector(VectorType& vector, size_t size, const RandomFunc& randomFunc)
> {
>diff --git a/Source/WTF/wtf/Range.h b/Source/WTF/wtf/Range.h
>index 96d52eb339fd6ddbb39dda8df9367dbc60dc1135..68337495e4ad59c99bf292304e76f0c2db52bd15 100644
>--- a/Source/WTF/wtf/Range.h
>+++ b/Source/WTF/wtf/Range.h
>@@ -115,6 +115,11 @@ class Range {
>         return m_begin <= point && point < m_end;
>     }
> 
>+    bool subsumes(const Range& other) const
>+    {
>+        return WTF::rangesSubsume(m_begin, m_end, other.m_begin, other.m_end);
>+    }
>+
>     void dump(PrintStream& out) const
>     {
>         if (*this == Range()) {
>diff --git a/JSTests/ChangeLog b/JSTests/ChangeLog
>index e100f992da658e78e2e53d37fa2997a72b569f1a..523e41f2da76e5b9051cd2a0b80c97db21e4b2bb 100644
>--- a/JSTests/ChangeLog
>+++ b/JSTests/ChangeLog
>@@ -1,3 +1,38 @@
>+2020-11-10  Yusuke Suzuki  <ysuzuki@apple.com>
>+
>+        [JSC] Implement Intl.DateTimeFormat.formatRangeToParts
>+        https://bugs.webkit.org/show_bug.cgi?id=213822
>+        <rdar://problem/69328711>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * stress/intl-datetimeformat-formatrange-should-not-handle-gregorian-change-date.js: Added.
>+        (shouldBe):
>+        (vm.icuHeaderVersion):
>+        * stress/intl-datetimeformat-formatrange.js:
>+        (shouldThrow):
>+        (test):
>+        * stress/intl-datetimeformat-formatrangetoparts-relevant-extensions-ja.js: Added.
>+        (shouldBe):
>+        (compareParts):
>+        (shouldThrow):
>+        (vm.icuVersion):
>+        * stress/intl-datetimeformat-formatrangetoparts-relevant-extensions.js: Added.
>+        (shouldBe):
>+        (compareParts):
>+        (shouldThrow):
>+        * stress/intl-datetimeformat-formatrangetoparts-should-not-handle-gregorian-change-date.js: Added.
>+        (shouldBe):
>+        (compareParts):
>+        (vm.icuHeaderVersion):
>+        * stress/intl-datetimeformat-formatrangetoparts.js: Added.
>+        (shouldBe):
>+        (compareParts):
>+        (shouldThrow):
>+        (test):
>+        * test262/config.yaml:
>+        * test262/expectations.yaml:
>+
> 2020-11-10  Ross Kirsling  <ross.kirsling@sony.com>
> 
>         Align %TypedArray% behavior with recent spec adjustments
>diff --git a/JSTests/stress/intl-datetimeformat-formatrange-should-not-handle-gregorian-change-date.js b/JSTests/stress/intl-datetimeformat-formatrange-should-not-handle-gregorian-change-date.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..ca37d9297d19088359ef3a89fb37b6d53654c881
>--- /dev/null
>+++ b/JSTests/stress/intl-datetimeformat-formatrange-should-not-handle-gregorian-change-date.js
>@@ -0,0 +1,30 @@
>+// Copyright 2019 the V8 project authors. All rights reserved.
>+// Copyright 2020 Apple Inc. All rights reserved.
>+// Use of this source code is governed by a BSD-style license.
>+
>+function shouldBe(actual, expected) {
>+    if (actual !== expected)
>+        throw new Error('bad value: ' + actual);
>+}
>+
>+if ($vm.icuHeaderVersion() >= 67) {
>+    let df = new Intl.DateTimeFormat("en");
>+    // A modern date
>+    let d1 = new Date(2019, 3, 4);
>+    let d2 = new Date(2019, 4, 5);
>+    shouldBe(df.format(d1), df.formatRange(d1, d1));
>+    shouldBe(df.format(d2), df.formatRange(d2, d2));
>+    shouldBe("4/4/2019 â 5/5/2019", df.formatRange(d1, d2));
>+    // An old date just before the Julian / Gregorian switch
>+    let d3 = new Date(1582, 8, 13);
>+    let d4 = new Date(1582, 9, 14);
>+    shouldBe(df.format(d3), df.formatRange(d3, d3));
>+    shouldBe(df.format(d4), df.formatRange(d4, d4));
>+    shouldBe("9/13/1582 â 10/14/1582", df.formatRange(d3, d4));
>+    // An older date
>+    let d5 = new Date(1000, 0, 1);
>+    let d6 = new Date(1001, 1, 2);
>+    shouldBe(df.format(d5), df.formatRange(d5, d5));
>+    shouldBe(df.format(d6), df.formatRange(d6, d6));
>+    shouldBe("1/1/1000 â 2/2/1001", df.formatRange(d5, d6));
>+}
>diff --git a/JSTests/stress/intl-datetimeformat-formatrange.js b/JSTests/stress/intl-datetimeformat-formatrange.js
>index 4f0529901d1b802c185c85b53027a7adafef60d5..449d7b269ec7d5bdf0b8a0bd3105808d4df23d11 100644
>--- a/JSTests/stress/intl-datetimeformat-formatrange.js
>+++ b/JSTests/stress/intl-datetimeformat-formatrange.js
>@@ -31,10 +31,13 @@ function shouldThrow(func, errorMessage) {
>     fmt0.formatRange();
> }, `TypeError: startDate or endDate is undefined`);
> 
>+shouldThrow(() => {
>+    fmt0.formatRange(new Date(Date.UTC(2008, 0, 20, 10, 0, 0)), new Date(Date.UTC(2007, 0, 10, 10, 0, 0)));
>+}, `RangeError: startDate is larger than endDate`);
> 
> function test() {
>-    let range = "âââ"; // This is not usual space unfortuantely in older ICU versions.
>-    if ($vm.icuVersion() >= 65)
>+    let range = "âââ";
>+    if ($vm.icuVersion() >= 67)
>         range = " â ";
> 
>     let date1 = new Date(Date.UTC(2007, 0, 10, 10, 0, 0));
>@@ -52,6 +55,7 @@ function test() {
>             timeZone: 'America/Los_Angeles',
>         });
>         shouldBe(fmt1.format(date1), `1/10/07, 2:00 AM`);
>+        shouldBe(fmt1.formatRange(date1, date1), `1/10/07, 2:00 AM`);
>         shouldBe(fmt1.formatRange(date1, date2), `1/10/07, 2:00${range}3:00 AM`);
>         shouldBe(fmt1.formatRange(date1, date3), `1/10/07, 2:00 AM${range}1/20/07, 2:00 AM`);
>     }
>@@ -64,6 +68,7 @@ function test() {
>             timeZone: 'America/Los_Angeles',
>         });
>         shouldBe(fmt1.format(date1), `1/10/07`);
>+        shouldBe(fmt1.formatRange(date1, date1), `1/10/07`);
>         shouldBe(fmt1.formatRange(date1, date2), `1/10/07`);
>         shouldBe(fmt1.formatRange(date1, date3), `1/10/07${range}1/20/07`);
>     }
>@@ -75,6 +80,7 @@ function test() {
>             timeZone: 'America/Los_Angeles',
>         });
>         shouldBe(fmt1.format(date1), `2007`);
>+        shouldBe(fmt1.formatRange(date1, date1), `2007`);
>         shouldBe(fmt1.formatRange(date1, date2), `2007`);
>         shouldBe(fmt1.formatRange(date1, date4), `2007${range}2008`);
>     }
>@@ -89,6 +95,7 @@ function test() {
>             timeZone: 'UTC',
>         });
>         shouldBe(fmt1.format(date1), `1/10/07, 10:00 AM`);
>+        shouldBe(fmt1.formatRange(date1, date1), `1/10/07, 10:00 AM`);
>         shouldBe(fmt1.formatRange(date1, date2), `1/10/07, 10:00${range}11:00 AM`);
>         shouldBe(fmt1.formatRange(date1, date3), `1/10/07, 10:00 AM${range}1/20/07, 10:00 AM`);
>     }
>@@ -101,6 +108,7 @@ function test() {
>             timeZone: 'America/Los_Angeles',
>         });
>         shouldBe(fmt2.format(date1), `Jan 10, 2007`);
>+        shouldBe(fmt2.formatRange(date1, date1), `Jan 10, 2007`);
>         shouldBe(fmt2.formatRange(date1, date2), `Jan 10, 2007`);
>         shouldBe(fmt2.formatRange(date1, date3), `Jan 10${range}20, 2007`);
>     }
>diff --git a/JSTests/stress/intl-datetimeformat-formatrangetoparts-relevant-extensions-ja.js b/JSTests/stress/intl-datetimeformat-formatrangetoparts-relevant-extensions-ja.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..3437368b4343c5d15e1d146fef167743421464f1
>--- /dev/null
>+++ b/JSTests/stress/intl-datetimeformat-formatrangetoparts-relevant-extensions-ja.js
>@@ -0,0 +1,1677 @@
>+function shouldBe(actual, expected) {
>+    if (actual !== expected)
>+        throw new Error('bad value: ' + actual + ' expected value: ' + expected);
>+}
>+
>+function compareParts(actual, expected) {
>+    shouldBe(actual.length, expected.length);
>+    for (var i = 0; i < actual.length; ++i) {
>+        shouldBe(actual[i].type, expected[i].type);
>+        shouldBe(actual[i].value, expected[i].value);
>+        shouldBe(actual[i].source, expected[i].source);
>+    }
>+}
>+
>+function shouldThrow(func, errorMessage) {
>+    var errorThrown = false;
>+    var error = null;
>+    try {
>+        func();
>+    } catch (e) {
>+        errorThrown = true;
>+        error = e;
>+    }
>+    if (!errorThrown)
>+        throw new Error('not thrown');
>+    if (String(error) !== errorMessage)
>+        throw new Error(`bad error: ${String(error)}`);
>+}
>+
>+let date1 = new Date(Date.UTC(2007, 0, 10, 10, 0, 0));
>+let date2 = new Date(Date.UTC(2007, 0, 10, 11, 0, 0));
>+let date3 = new Date(Date.UTC(2007, 0, 20, 10, 0, 0));
>+let date4 = new Date(Date.UTC(2010, 0, 20, 10, 0, 0));
>+
>+let date5 = new Date(Date.UTC(2007, 0, 10, 12, 0, 0));
>+let date6 = new Date(Date.UTC(2007, 0, 10, 14, 0, 0));
>+let date7 = new Date(Date.UTC(2007, 0, 10, 23, 0, 0));
>+let date8 = new Date(Date.UTC(2007, 0, 11, 0, 0, 0));
>+
>+if ($vm.icuVersion() >= 64) {
>+    // Test three relavant extensions.
>+    // "nu" NumberingSystem
>+    let fmt1 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'America/Los_Angeles',
>+        numberingSystem: 'hanidec',
>+    });
>+    shouldBe(fmt1.format(date1), `ãä¸/ä¸/ä¸ã äº:ãã`);
>+    compareParts(fmt1.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"ãä¸","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"ä¸","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"ä¸ã","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"äº","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"ãã","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"ä¸","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"ãã","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt1.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"ãä¸","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"ä¸","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"ä¸ã","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"hour","value":"äº","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"ãã","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"ãä¸","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"ä¸","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"äºã","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"hour","value":"äº","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"ãã","source":"endRange"},
>+    ]);
>+
>+    // "ca" Calendar
>+    let fmt2 = new Intl.DateTimeFormat("ja", {
>+        year: 'numeric',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'America/Los_Angeles',
>+        calendar: 'chinese'
>+    });
>+    shouldBe(fmt2.format(date1), `ä¸æå¹´11æ22æ¥ 2:00`);
>+    compareParts(fmt2.formatRangeToParts(date1, date2), [
>+        {"type":"yearName","value":"ä¸æ","source":"shared"},
>+        {"type":"literal","value":"å¹´","source":"shared"},
>+        {"type":"month","value":"11","source":"shared"},
>+        {"type":"literal","value":"æ","source":"shared"},
>+        {"type":"day","value":"22","source":"shared"},
>+        {"type":"literal","value":"æ¥ ","source":"shared"},
>+        {"type":"hour","value":"2","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"3","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt2.formatRangeToParts(date1, date3), [
>+        {"type":"yearName","value":"ä¸æ","source":"startRange"},
>+        {"type":"literal","value":"å¹´","source":"startRange"},
>+        {"type":"month","value":"11","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"day","value":"22","source":"startRange"},
>+        {"type":"literal","value":"æ¥ ","source":"startRange"},
>+        {"type":"hour","value":"2","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"yearName","value":"ä¸æ","source":"endRange"},
>+        {"type":"literal","value":"å¹´","source":"endRange"},
>+        {"type":"month","value":"12","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"day","value":"2","source":"endRange"},
>+        {"type":"literal","value":"æ¥ ","source":"endRange"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+
>+    let fmt3 = new Intl.DateTimeFormat("ja", {
>+        year: 'numeric',
>+        timeZone: 'America/Los_Angeles',
>+        calendar: 'chinese'
>+    });
>+    shouldBe(fmt3.format(date1), `ä¸æå¹´`);
>+    compareParts(fmt3.formatRangeToParts(date1, date2), [
>+        {"type":"yearName","value":"ä¸æ","source":"shared"},
>+        {"type":"literal","value":"å¹´","source":"shared"},
>+    ]);
>+    compareParts(fmt3.formatRangeToParts(date1, date3), [
>+        {"type":"yearName","value":"ä¸æ","source":"shared"},
>+        {"type":"literal","value":"å¹´","source":"shared"},
>+    ]);
>+    compareParts(fmt3.formatRangeToParts(date1, date4), [
>+        {"type":"yearName","value":"ä¸æ","source":"startRange"},
>+        {"type":"literal","value":"å¹´ï½","source":"shared"},
>+        {"type":"yearName","value":"å·±ä¸","source":"endRange"},
>+        {"type":"literal","value":"å¹´","source":"shared"},
>+    ]);
>+
>+    // Calendar-sensitive format
>+    let fmt4 = new Intl.DateTimeFormat('ja-u-ca-buddhist', {
>+        year: 'numeric',
>+        timeZone: 'America/Los_Angeles',
>+    });
>+    shouldBe(fmt4.format(date1), `ä»æ¦2550å¹´`);
>+    compareParts(fmt4.formatRangeToParts(date1, date2), [
>+        {"type":"era","value":"ä»æ¦","source":"shared"},
>+        {"type":"year","value":"2550","source":"shared"},
>+        {"type":"literal","value":"å¹´","source":"shared"},
>+    ]);
>+    compareParts(fmt4.formatRangeToParts(date1, date3), [
>+        {"type":"era","value":"ä»æ¦","source":"shared"},
>+        {"type":"year","value":"2550","source":"shared"},
>+        {"type":"literal","value":"å¹´","source":"shared"},
>+    ]);
>+    compareParts(fmt4.formatRangeToParts(date1, date4), [
>+        {"type":"era","value":"ä»æ¦","source":"shared"},
>+        {"type":"year","value":"2550","source":"startRange"},
>+        {"type":"literal","value":"å¹´ï½","source":"shared"},
>+        {"type":"year","value":"2553","source":"endRange"},
>+        {"type":"literal","value":"å¹´","source":"shared"},
>+    ]);
>+
>+    // "hc" HourCycle
>+    let fmt5 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h24',
>+    });
>+    shouldBe(fmt5.format(date1), `07/1/10 10:00`);
>+    shouldBe(fmt5.format(date8), `07/1/11 24:00`);
>+    compareParts(fmt5.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt5.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt5.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt5.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"hour","value":"14","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt5.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"hour","value":"23","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    if ($vm.icuVersion() > 66) {
>+        compareParts(fmt5.formatRangeToParts(date1, date8), [
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":"ï½","source":"shared"},
>+            {"type":"year","value":"07","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"11","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"hour","value":"24","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+        ]);
>+    }
>+
>+    let fmt6 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h23',
>+    });
>+    shouldBe(fmt6.format(date1), `07/1/10 10:00`);
>+    shouldBe(fmt6.format(date8), `07/1/11 0:00`);
>+    compareParts(fmt6.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt6.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt6.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt6.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"14","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt6.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"23","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt6.formatRangeToParts(date1, date8), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+
>+    let fmt7 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h11',
>+    });
>+    shouldBe(fmt7.format(date1), `07/1/10 åå10:00`);
>+    shouldBe(fmt7.format(date8), `07/1/11 åå0:00`);
>+    compareParts(fmt7.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt7.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt7.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt7.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt7.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt7.formatRangeToParts(date1, date8), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+
>+    let fmt8 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h12',
>+    });
>+    shouldBe(fmt8.format(date1), `07/1/10 åå10:00`);
>+    shouldBe(fmt8.format(date8), `07/1/11 åå12:00`);
>+    compareParts(fmt8.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt8.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt8.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt8.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt8.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    if ($vm.icuVersion() > 66) {
>+        compareParts(fmt8.formatRangeToParts(date1, date8), [
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"dayPeriod","value":"åå","source":"startRange"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":"ï½","source":"shared"},
>+            {"type":"year","value":"07","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"11","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"dayPeriod","value":"åå","source":"endRange"},
>+            {"type":"hour","value":"12","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+        ]);
>+    }
>+
>+    // "hc" + hour 2-digit
>+    let fmt9 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h24',
>+    });
>+    shouldBe(fmt9.format(date1), `07/1/10 10:00`);
>+    shouldBe(fmt9.format(date8), `07/1/11 24:00`);
>+    compareParts(fmt9.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt9.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt9.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt9.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"hour","value":"14","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt9.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"hour","value":"23","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    if ($vm.icuVersion() > 66) {
>+        compareParts(fmt9.formatRangeToParts(date1, date8), [
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":"ï½","source":"shared"},
>+            {"type":"year","value":"07","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"11","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"hour","value":"24","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+        ]);
>+    }
>+
>+    let fmt10 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h23',
>+    });
>+    shouldBe(fmt10.format(date1), `07/1/10 10:00`);
>+    shouldBe(fmt10.format(date8), `07/1/11 00:00`);
>+    compareParts(fmt10.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt10.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt10.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt10.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"14","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt10.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"23","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt10.formatRangeToParts(date1, date8), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+
>+    let fmt11 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h11',
>+    });
>+    shouldBe(fmt11.format(date1), `07/1/10 åå10:00`);
>+    shouldBe(fmt11.format(date8), `07/1/11 åå00:00`);
>+    compareParts(fmt11.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt11.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt11.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt11.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt11.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt11.formatRangeToParts(date1, date8), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+
>+    let fmt12 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h12',
>+    });
>+    shouldBe(fmt12.format(date1), `07/1/10 åå10:00`);
>+    shouldBe(fmt12.format(date8), `07/1/11 åå12:00`);
>+    compareParts(fmt12.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt12.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt12.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt12.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    compareParts(fmt12.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":"æ","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"åï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":"æ","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":"å","source":"shared"},
>+    ]);
>+    if ($vm.icuVersion() > 66) {
>+        compareParts(fmt12.formatRangeToParts(date1, date8), [
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"dayPeriod","value":"åå","source":"startRange"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":"ï½","source":"shared"},
>+            {"type":"year","value":"07","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"11","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"dayPeriod","value":"åå","source":"endRange"},
>+            {"type":"hour","value":"12","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+        ]);
>+    }
>+
>+    // "hc" + hour12.
>+    let fmt13 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h24',
>+        hour12: true,
>+    });
>+    shouldBe(fmt13.format(date1), `07/1/10 åå10:00`);
>+    shouldBe(fmt13.format(date8), `07/1/11 åå00:00`);
>+    compareParts(fmt13.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt13.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt13.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt13.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt13.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt13.formatRangeToParts(date1, date8), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+
>+    let fmt14 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h23',
>+        hour12: true,
>+    });
>+    shouldBe(fmt14.format(date1), `07/1/10 åå10:00`);
>+    shouldBe(fmt14.format(date8), `07/1/11 åå00:00`);
>+    compareParts(fmt14.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt14.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt14.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt14.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt14.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt14.formatRangeToParts(date1, date8), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+
>+    let fmt15 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h11',
>+        hour12: true,
>+    });
>+    shouldBe(fmt15.format(date1), `07/1/10 åå10:00`);
>+    shouldBe(fmt15.format(date8), `07/1/11 åå00:00`);
>+    compareParts(fmt15.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt15.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt15.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt15.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt15.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt15.formatRangeToParts(date1, date8), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+
>+    let fmt16 = new Intl.DateTimeFormat("ja", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h12',
>+        hour12: true,
>+    });
>+    shouldBe(fmt16.format(date1), `07/1/10 åå10:00`);
>+    shouldBe(fmt16.format(date8), `07/1/11 åå00:00`);
>+    compareParts(fmt16.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt16.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt16.formatRangeToParts(date1, date5), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt16.formatRangeToParts(date1, date6), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt16.formatRangeToParts(date1, date7), [
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"dayPeriod","value":"åå¾","source":"endRange"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt16.formatRangeToParts(date1, date8), [
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"åå","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":"ï½","source":"shared"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"åå","source":"endRange"},
>+        {"type":"hour","value":"0","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+}
>diff --git a/JSTests/stress/intl-datetimeformat-formatrangetoparts-relevant-extensions.js b/JSTests/stress/intl-datetimeformat-formatrangetoparts-relevant-extensions.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..daff9fe508cd9095bc71c803f9673c69ace03a04
>--- /dev/null
>+++ b/JSTests/stress/intl-datetimeformat-formatrangetoparts-relevant-extensions.js
>@@ -0,0 +1,1776 @@
>+function shouldBe(actual, expected) {
>+    if (actual !== expected)
>+        throw new Error('bad value: ' + actual + ' expected value: ' + expected);
>+}
>+
>+function compareParts(actual, expected) {
>+    shouldBe(actual.length, expected.length);
>+    for (var i = 0; i < actual.length; ++i) {
>+        shouldBe(actual[i].type, expected[i].type);
>+        shouldBe(actual[i].value, expected[i].value);
>+        shouldBe(actual[i].source, expected[i].source);
>+    }
>+}
>+
>+function shouldThrow(func, errorMessage) {
>+    var errorThrown = false;
>+    var error = null;
>+    try {
>+        func();
>+    } catch (e) {
>+        errorThrown = true;
>+        error = e;
>+    }
>+    if (!errorThrown)
>+        throw new Error('not thrown');
>+    if (String(error) !== errorMessage)
>+        throw new Error(`bad error: ${String(error)}`);
>+}
>+
>+function test() {
>+    let range = "âââ";
>+    if ($vm.icuVersion() >= 67)
>+        range = " â ";
>+
>+    let date1 = new Date(Date.UTC(2007, 0, 10, 10, 0, 0));
>+    let date2 = new Date(Date.UTC(2007, 0, 10, 11, 0, 0));
>+    let date3 = new Date(Date.UTC(2007, 0, 20, 10, 0, 0));
>+    let date4 = new Date(Date.UTC(2010, 0, 20, 10, 0, 0));
>+
>+    let date5 = new Date(Date.UTC(2007, 0, 10, 12, 0, 0));
>+    let date6 = new Date(Date.UTC(2007, 0, 10, 14, 0, 0));
>+    let date7 = new Date(Date.UTC(2007, 0, 10, 23, 0, 0));
>+    let date8 = new Date(Date.UTC(2007, 0, 11, 0, 0, 0));
>+
>+    // Test three relavant extensions.
>+    // "nu" NumberingSystem
>+    let fmt1 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'America/Los_Angeles',
>+        numberingSystem: 'hanidec',
>+    });
>+    shouldBe(fmt1.format(date1), `ä¸/ä¸ã/ãä¸, äº:ãã AM`);
>+    compareParts(fmt1.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"ä¸","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"ä¸ã","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"ãä¸","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"äº","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"ãã","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"ä¸","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"ãã","source":"endRange"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"AM","source":"shared"},
>+    ]);
>+    compareParts(fmt1.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"ä¸","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"ä¸ã","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"ãä¸","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"äº","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"ãã","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"ä¸","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"äºã","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"ãä¸","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"äº","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"ãã","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+
>+    // "ca" Calendar
>+    let fmt2 = new Intl.DateTimeFormat("en", {
>+        year: 'numeric',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'America/Los_Angeles',
>+        calendar: 'chinese'
>+    });
>+    shouldBe(fmt2.format(date1), `11/22/2006, 2:00 AM`);
>+    compareParts(fmt2.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"11","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"22","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"relatedYear","value":"2006","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"2","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"3","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"AM","source":"shared"},
>+    ]);
>+    compareParts(fmt2.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"11","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"22","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"relatedYear","value":"2006","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"2","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"12","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"2","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"relatedYear","value":"2006","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+
>+    let fmt3 = new Intl.DateTimeFormat("en", {
>+        year: 'numeric',
>+        timeZone: 'America/Los_Angeles',
>+        calendar: 'chinese'
>+    });
>+    shouldBe(fmt3.format(date1), `2006(bing-xu)`);
>+    compareParts(fmt3.formatRangeToParts(date1, date2), [
>+        {"type":"relatedYear","value":"2006","source":"shared"},
>+        {"type":"literal","value":"(","source":"shared"},
>+        {"type":"yearName","value":"bing-xu","source":"shared"},
>+        {"type":"literal","value":")","source":"shared"},
>+    ]);
>+    compareParts(fmt3.formatRangeToParts(date1, date3), [
>+        {"type":"relatedYear","value":"2006","source":"shared"},
>+        {"type":"literal","value":"(","source":"shared"},
>+        {"type":"yearName","value":"bing-xu","source":"shared"},
>+        {"type":"literal","value":")","source":"shared"},
>+    ]);
>+    compareParts(fmt3.formatRangeToParts(date1, date4), [
>+        {"type":"relatedYear","value":"2006","source":"startRange"},
>+        {"type":"literal","value":"(","source":"startRange"},
>+        {"type":"yearName","value":"bing-xu","source":"startRange"},
>+        {"type":"literal","value":`)${range}`,"source":"shared"},
>+        {"type":"relatedYear","value":"2009","source":"endRange"},
>+        {"type":"literal","value":"(","source":"endRange"},
>+        {"type":"yearName","value":"ji-chou","source":"endRange"},
>+        {"type":"literal","value":")","source":"shared"},
>+    ]);
>+
>+    // Calendar-sensitive format
>+    let fmt4 = new Intl.DateTimeFormat('en-u-ca-buddhist', {
>+        year: 'numeric',
>+        timeZone: 'America/Los_Angeles',
>+    });
>+    shouldBe(fmt4.format(date1), `2550 BE`);
>+    compareParts(fmt4.formatRangeToParts(date1, date2), [
>+        {"type":"year","value":"2550","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"era","value":"BE","source":"shared"},
>+    ]);
>+    compareParts(fmt4.formatRangeToParts(date1, date3), [
>+        {"type":"year","value":"2550","source":"shared"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"era","value":"BE","source":"shared"},
>+    ]);
>+    compareParts(fmt4.formatRangeToParts(date1, date4), [
>+        {"type":"year","value":"2550","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"year","value":"2553","source":"endRange"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"era","value":"BE","source":"shared"},
>+    ]);
>+
>+    // "hc" HourCycle
>+    let fmt5 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h24',
>+    });
>+    shouldBe(fmt5.format(date1), `1/10/07, 10:00`);
>+    shouldBe(fmt5.format(date8), `1/11/07, 24:00`);
>+    compareParts(fmt5.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt5.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt5.formatRangeToParts(date1, date5), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt5.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"14","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt5.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"23","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    if ($vm.icuVersion() > 66) {
>+        compareParts(fmt5.formatRangeToParts(date1, date8), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":", ","source":"startRange"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"11","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"07","source":"endRange"},
>+            {"type":"literal","value":", ","source":"endRange"},
>+            {"type":"hour","value":"24","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+        ]);
>+    }
>+
>+    let fmt6 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h23',
>+    });
>+    shouldBe(fmt6.format(date1), `1/10/07, 10:00`);
>+    shouldBe(fmt6.format(date8), `1/11/07, 00:00`);
>+    compareParts(fmt6.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt6.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt6.formatRangeToParts(date1, date5), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt6.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"14","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt6.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"23","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt6.formatRangeToParts(date1, date8), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"00","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+
>+    let fmt7 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h11',
>+    });
>+    shouldBe(fmt7.format(date1), `1/10/07, 10:00 AM`);
>+    shouldBe(fmt7.format(date8), `1/11/07, 0:00 AM`);
>+    compareParts(fmt7.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+    compareParts(fmt7.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+    if ($vm.icuVersion() > 66) {
>+        compareParts(fmt7.formatRangeToParts(date1, date5), [
>+            {"type":"month","value":"1","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"day","value":"10","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"year","value":"07","source":"shared"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"dayPeriod","value":"AM","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"hour","value":"0","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"dayPeriod","value":"PM","source":"endRange"},
>+        ]);
>+    }
>+    compareParts(fmt7.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt7.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    if ($vm.icuVersion() > 66) {
>+        compareParts(fmt7.formatRangeToParts(date1, date8), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":", ","source":"startRange"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"dayPeriod","value":"AM","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"11","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"07","source":"endRange"},
>+            {"type":"literal","value":", ","source":"endRange"},
>+            {"type":"hour","value":"0","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"dayPeriod","value":"AM","source":"endRange"},
>+        ]);
>+    }
>+
>+    let fmt8 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: 'numeric',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h12',
>+    });
>+    shouldBe(fmt8.format(date1), `1/10/07, 10:00 AM`);
>+    shouldBe(fmt8.format(date8), `1/11/07, 12:00 AM`);
>+    compareParts(fmt8.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"AM","source":"shared"},
>+    ]);
>+    compareParts(fmt8.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+    compareParts(fmt8.formatRangeToParts(date1, date5), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt8.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt8.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt8.formatRangeToParts(date1, date8), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+
>+    // "hc" + hour 2-digit
>+    let fmt9 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h24',
>+    });
>+    shouldBe(fmt9.format(date1), `1/10/07, 10:00`);
>+    shouldBe(fmt9.format(date8), `1/11/07, 24:00`);
>+    compareParts(fmt9.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt9.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt9.formatRangeToParts(date1, date5), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt9.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"14","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt9.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"23","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    if ($vm.icuVersion() > 66) {
>+        compareParts(fmt9.formatRangeToParts(date1, date8), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":", ","source":"startRange"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"11","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"07","source":"endRange"},
>+            {"type":"literal","value":", ","source":"endRange"},
>+            {"type":"hour","value":"24","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+        ]);
>+    }
>+
>+    let fmt10 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h23',
>+    });
>+    shouldBe(fmt10.format(date1), `1/10/07, 10:00`);
>+    shouldBe(fmt10.format(date8), `1/11/07, 00:00`);
>+    compareParts(fmt10.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt10.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt10.formatRangeToParts(date1, date5), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt10.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"14","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt10.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"23","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+    compareParts(fmt10.formatRangeToParts(date1, date8), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"00","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+    ]);
>+
>+    let fmt11 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h11',
>+    });
>+    shouldBe(fmt11.format(date1), `1/10/07, 10:00 AM`);
>+    shouldBe(fmt11.format(date8), `1/11/07, 00:00 AM`);
>+    compareParts(fmt11.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+    compareParts(fmt11.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+    if ($vm.icuVersion() > 66) {
>+        compareParts(fmt11.formatRangeToParts(date1, date5), [
>+            {"type":"month","value":"1","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"day","value":"10","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"year","value":"07","source":"shared"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"dayPeriod","value":"AM","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"hour","value":"0","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"dayPeriod","value":"PM","source":"endRange"},
>+        ]);
>+    }
>+    compareParts(fmt11.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt11.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    if ($vm.icuVersion() > 66) {
>+        compareParts(fmt11.formatRangeToParts(date1, date8), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":", ","source":"startRange"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"dayPeriod","value":"AM","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"11","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"07","source":"endRange"},
>+            {"type":"literal","value":", ","source":"endRange"},
>+            {"type":"hour","value":"0","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"dayPeriod","value":"AM","source":"endRange"},
>+        ]);
>+    }
>+
>+    let fmt12 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h12',
>+    });
>+    shouldBe(fmt12.format(date1), `1/10/07, 10:00 AM`);
>+    shouldBe(fmt12.format(date8), `1/11/07, 12:00 AM`);
>+    compareParts(fmt12.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"AM","source":"shared"},
>+    ]);
>+    compareParts(fmt12.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+    compareParts(fmt12.formatRangeToParts(date1, date5), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt12.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt12.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt12.formatRangeToParts(date1, date8), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+
>+    // "hc" + hour12.
>+    let fmt13 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h24',
>+        hour12: true,
>+    });
>+    shouldBe(fmt13.format(date1), `1/10/07, 10:00 AM`);
>+    shouldBe(fmt13.format(date8), `1/11/07, 12:00 AM`);
>+    compareParts(fmt13.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"AM","source":"shared"},
>+    ]);
>+    compareParts(fmt13.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+    compareParts(fmt13.formatRangeToParts(date1, date5), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt13.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt13.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt13.formatRangeToParts(date1, date8), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+
>+    let fmt14 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h23',
>+        hour12: true,
>+    });
>+    shouldBe(fmt14.format(date1), `1/10/07, 10:00 AM`);
>+    shouldBe(fmt14.format(date8), `1/11/07, 12:00 AM`);
>+    compareParts(fmt14.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"AM","source":"shared"},
>+    ]);
>+    compareParts(fmt14.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+    compareParts(fmt14.formatRangeToParts(date1, date5), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt14.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt14.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt14.formatRangeToParts(date1, date8), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+
>+    let fmt15 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h11',
>+        hour12: true,
>+    });
>+    shouldBe(fmt15.format(date1), `1/10/07, 10:00 AM`);
>+    shouldBe(fmt15.format(date8), `1/11/07, 12:00 AM`);
>+    compareParts(fmt15.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"AM","source":"shared"},
>+    ]);
>+    compareParts(fmt15.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+    compareParts(fmt15.formatRangeToParts(date1, date5), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt15.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt15.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt15.formatRangeToParts(date1, date8), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+
>+    let fmt16 = new Intl.DateTimeFormat("en", {
>+        year: '2-digit',
>+        month: 'numeric',
>+        day: 'numeric',
>+        hour: '2-digit',
>+        minute: 'numeric',
>+        timeZone: 'UTC',
>+        hourCycle: 'h12',
>+        hour12: true,
>+    });
>+    shouldBe(fmt16.format(date1), `1/10/07, 10:00 AM`);
>+    shouldBe(fmt16.format(date8), `1/11/07, 12:00 AM`);
>+    compareParts(fmt16.formatRangeToParts(date1, date2), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"shared"},
>+        {"type":"dayPeriod","value":"AM","source":"shared"},
>+    ]);
>+    compareParts(fmt16.formatRangeToParts(date1, date3), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"20","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"10","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+    compareParts(fmt16.formatRangeToParts(date1, date5), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt16.formatRangeToParts(date1, date6), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"2","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt16.formatRangeToParts(date1, date7), [
>+        {"type":"month","value":"1","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"day","value":"10","source":"shared"},
>+        {"type":"literal","value":"/","source":"shared"},
>+        {"type":"year","value":"07","source":"shared"},
>+        {"type":"literal","value":", ","source":"shared"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"hour","value":"11","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"PM","source":"endRange"},
>+    ]);
>+    compareParts(fmt16.formatRangeToParts(date1, date8), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"10","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"07","source":"startRange"},
>+        {"type":"literal","value":", ","source":"startRange"},
>+        {"type":"hour","value":"10","source":"startRange"},
>+        {"type":"literal","value":":","source":"startRange"},
>+        {"type":"minute","value":"00","source":"startRange"},
>+        {"type":"literal","value":" ","source":"startRange"},
>+        {"type":"dayPeriod","value":"AM","source":"startRange"},
>+        {"type":"literal","value":range,"source":"shared"},
>+        {"type":"month","value":"1","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"11","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"07","source":"endRange"},
>+        {"type":"literal","value":", ","source":"endRange"},
>+        {"type":"hour","value":"12","source":"endRange"},
>+        {"type":"literal","value":":","source":"endRange"},
>+        {"type":"minute","value":"00","source":"endRange"},
>+        {"type":"literal","value":" ","source":"endRange"},
>+        {"type":"dayPeriod","value":"AM","source":"endRange"},
>+    ]);
>+}
>+
>+if ($vm.icuVersion() >= 64)
>+    test();
>diff --git a/JSTests/stress/intl-datetimeformat-formatrangetoparts-should-not-handle-gregorian-change-date.js b/JSTests/stress/intl-datetimeformat-formatrangetoparts-should-not-handle-gregorian-change-date.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..f7a1b980263a251f0200b7d86808410fe09d9173
>--- /dev/null
>+++ b/JSTests/stress/intl-datetimeformat-formatrangetoparts-should-not-handle-gregorian-change-date.js
>@@ -0,0 +1,76 @@
>+// Copyright 2019 the V8 project authors. All rights reserved.
>+// Copyright 2020 Apple Inc. All rights reserved.
>+// Use of this source code is governed by a BSD-style license.
>+
>+function shouldBe(actual, expected) {
>+    if (actual !== expected)
>+        throw new Error('bad value: ' + actual);
>+}
>+
>+function compareParts(actual, expected, actualSourceUndefined) {
>+    shouldBe(actual.length, expected.length);
>+    for (var i = 0; i < actual.length; ++i) {
>+        shouldBe(actual[i].type, expected[i].type);
>+        shouldBe(actual[i].value, expected[i].value);
>+        if (actualSourceUndefined)
>+            shouldBe(actual[i].source, undefined);
>+    }
>+}
>+
>+if ($vm.icuHeaderVersion() >= 67) {
>+    let df = new Intl.DateTimeFormat("en");
>+    // A modern date
>+    let d1 = new Date(2019, 3, 4);
>+    let d2 = new Date(2019, 4, 5);
>+    compareParts(df.formatToParts(d1), df.formatRangeToParts(d1, d1), true);
>+    compareParts(df.formatToParts(d2), df.formatRangeToParts(d2, d2), true);
>+    compareParts(df.formatRangeToParts(d1, d2), [
>+        {"type":"month","value":"4","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"4","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"2019","source":"startRange"},
>+        {"type":"literal","value":" â ","source":"shared"},
>+        {"type":"month","value":"5","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"5","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"2019","source":"endRange"},
>+    ]);
>+    // An old date just before the Julian / Gregorian switch
>+    let d3 = new Date(1582, 8, 13);
>+    let d4 = new Date(1582, 9, 14);
>+    compareParts(df.formatToParts(d3), df.formatRangeToParts(d3, d3), true);
>+    compareParts(df.formatToParts(d4), df.formatRangeToParts(d4, d4), true);
>+    compareParts(df.formatRangeToParts(d3, d4), [
>+        {"type":"month","value":"9","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"13","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"1582","source":"startRange"},
>+        {"type":"literal","value":" â ","source":"shared"},
>+        {"type":"month","value":"10","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"14","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"1582","source":"endRange"},
>+    ]);
>+    // An older date
>+    let d5 = new Date(1000, 0, 1);
>+    let d6 = new Date(1001, 1, 2);
>+    compareParts(df.formatToParts(d5), df.formatRangeToParts(d5, d5), true);
>+    compareParts(df.formatToParts(d6), df.formatRangeToParts(d6, d6), true);
>+    compareParts(df.formatRangeToParts(d5, d6), [
>+        {"type":"month","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"day","value":"1","source":"startRange"},
>+        {"type":"literal","value":"/","source":"startRange"},
>+        {"type":"year","value":"1000","source":"startRange"},
>+        {"type":"literal","value":" â ","source":"shared"},
>+        {"type":"month","value":"2","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"day","value":"2","source":"endRange"},
>+        {"type":"literal","value":"/","source":"endRange"},
>+        {"type":"year","value":"1001","source":"endRange"},
>+    ]);
>+}
>diff --git a/JSTests/stress/intl-datetimeformat-formatrangetoparts.js b/JSTests/stress/intl-datetimeformat-formatrangetoparts.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..1e321a54f22719ad0b3e813ad451208e02a06efb
>--- /dev/null
>+++ b/JSTests/stress/intl-datetimeformat-formatrangetoparts.js
>@@ -0,0 +1,455 @@
>+function shouldBe(actual, expected) {
>+    if (actual !== expected)
>+        throw new Error('bad value: ' + actual);
>+}
>+
>+function compareParts(actual, expected) {
>+    shouldBe(actual.length, expected.length);
>+    for (var i = 0; i < actual.length; ++i) {
>+        shouldBe(actual[i].type, expected[i].type);
>+        shouldBe(actual[i].value, expected[i].value);
>+        shouldBe(actual[i].source, expected[i].source);
>+    }
>+}
>+
>+function shouldThrow(func, errorMessage) {
>+    var errorThrown = false;
>+    var error = null;
>+    try {
>+        func();
>+    } catch (e) {
>+        errorThrown = true;
>+        error = e;
>+    }
>+    if (!errorThrown)
>+        throw new Error('not thrown');
>+    if (String(error) !== errorMessage)
>+        throw new Error(`bad error: ${String(error)}`);
>+}
>+
>+let fmt0 = new Intl.DateTimeFormat("en", {
>+    year: '2-digit',
>+    month: 'numeric',
>+    day: 'numeric',
>+    hour: 'numeric',
>+    minute: 'numeric',
>+    timeZone: 'America/Los_Angeles',
>+});
>+
>+shouldThrow(() => {
>+    fmt0.formatRangeToParts();
>+}, `TypeError: startDate or endDate is undefined`);
>+
>+shouldThrow(() => {
>+    fmt0.formatRangeToParts(new Date(Date.UTC(2008, 0, 20, 10, 0, 0)), new Date(Date.UTC(2007, 0, 10, 10, 0, 0)));
>+}, `RangeError: startDate is larger than endDate`);
>+
>+function test() {
>+    let range = "âââ"; // This is not usual space unfortuantely in ICU 66.
>+    if ($vm.icuVersion() > 66)
>+        range = " â ";
>+
>+    let date1 = new Date(Date.UTC(2007, 0, 10, 10, 0, 0));
>+    let date2 = new Date(Date.UTC(2007, 0, 10, 11, 0, 0));
>+    let date3 = new Date(Date.UTC(2007, 0, 20, 10, 0, 0));
>+    let date4 = new Date(Date.UTC(2008, 0, 20, 10, 0, 0));
>+
>+    {
>+        let fmt1 = new Intl.DateTimeFormat("en", {
>+            year: '2-digit',
>+            month: 'numeric',
>+            day: 'numeric',
>+            hour: 'numeric',
>+            minute: 'numeric',
>+            timeZone: 'America/Los_Angeles',
>+        });
>+        shouldBe(fmt1.format(date1), `1/10/07, 2:00 AM`);
>+        compareParts(fmt1.formatRangeToParts(date1, date1), [
>+            {"type":"month","value":"1","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"day","value":"10","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"year","value":"07","source":"shared"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"hour","value":"2","source":"shared"},
>+            {"type":"literal","value":":","source":"shared"},
>+            {"type":"minute","value":"00","source":"shared"},
>+            {"type":"literal","value":" ","source":"shared"},
>+            {"type":"dayPeriod","value":"AM","source":"shared"},
>+        ]);
>+        compareParts(fmt1.formatRangeToParts(date1, date2), [
>+            {"type":"month","value":"1","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"day","value":"10","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"year","value":"07","source":"shared"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"hour","value":"2","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"hour","value":"3","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+            {"type":"literal","value":" ","source":"shared"},
>+            {"type":"dayPeriod","value":"AM","source":"shared"},
>+        ]);
>+        compareParts(fmt1.formatRangeToParts(date1, date3), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":", ","source":"startRange"},
>+            {"type":"hour","value":"2","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"dayPeriod","value":"AM","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"20","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"07","source":"endRange"},
>+            {"type":"literal","value":", ","source":"endRange"},
>+            {"type":"hour","value":"2","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"dayPeriod","value":"AM","source":"endRange"},
>+        ]);
>+    }
>+
>+    {
>+        let fmt1 = new Intl.DateTimeFormat("en", {
>+            year: '2-digit',
>+            month: 'numeric',
>+            day: 'numeric',
>+            timeZone: 'America/Los_Angeles',
>+        });
>+        shouldBe(fmt1.format(date1), `1/10/07`);
>+        compareParts(fmt1.formatRangeToParts(date1, date1), [
>+            {"type":"month","value":"1","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"day","value":"10","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"year","value":"07","source":"shared"},
>+        ]);
>+        compareParts(fmt1.formatRangeToParts(date1, date2), [
>+            {"type":"month","value":"1","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"day","value":"10","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"year","value":"07","source":"shared"},
>+        ]);
>+        compareParts(fmt1.formatRangeToParts(date1, date3), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"20","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"07","source":"endRange"},
>+        ]);
>+    }
>+
>+
>+    {
>+        let fmt1 = new Intl.DateTimeFormat("en", {
>+            year: 'numeric',
>+            timeZone: 'America/Los_Angeles',
>+        });
>+        shouldBe(fmt1.format(date1), `2007`);
>+        compareParts(fmt1.formatRangeToParts(date1, date1), [
>+            {"type":"year","value":"2007","source":"shared"},
>+        ]);
>+        compareParts(fmt1.formatRangeToParts(date1, date2), [
>+            {"type":"year","value":"2007","source":"shared"},
>+        ]);
>+        compareParts(fmt1.formatRangeToParts(date1, date4), [
>+            {"type":"year","value":"2007","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"year","value":"2008","source":"endRange"},
>+        ]);
>+    }
>+
>+    {
>+        let fmt1 = new Intl.DateTimeFormat("en", {
>+            year: '2-digit',
>+            month: 'numeric',
>+            day: 'numeric',
>+            hour: 'numeric',
>+            minute: 'numeric',
>+            timeZone: 'UTC',
>+        });
>+        shouldBe(fmt1.format(date1), `1/10/07, 10:00 AM`);
>+        compareParts(fmt1.formatRangeToParts(date1, date1), [
>+            {"type":"month","value":"1","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"day","value":"10","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"year","value":"07","source":"shared"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"hour","value":"10","source":"shared"},
>+            {"type":"literal","value":":","source":"shared"},
>+            {"type":"minute","value":"00","source":"shared"},
>+            {"type":"literal","value":" ","source":"shared"},
>+            {"type":"dayPeriod","value":"AM","source":"shared"},
>+        ]);
>+        compareParts(fmt1.formatRangeToParts(date1, date2), [
>+            {"type":"month","value":"1","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"day","value":"10","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"year","value":"07","source":"shared"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"hour","value":"11","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+            {"type":"literal","value":" ","source":"shared"},
>+            {"type":"dayPeriod","value":"AM","source":"shared"},
>+        ]);
>+        compareParts(fmt1.formatRangeToParts(date1, date3), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"07","source":"startRange"},
>+            {"type":"literal","value":", ","source":"startRange"},
>+            {"type":"hour","value":"10","source":"startRange"},
>+            {"type":"literal","value":":","source":"startRange"},
>+            {"type":"minute","value":"00","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"dayPeriod","value":"AM","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"20","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"07","source":"endRange"},
>+            {"type":"literal","value":", ","source":"endRange"},
>+            {"type":"hour","value":"10","source":"endRange"},
>+            {"type":"literal","value":":","source":"endRange"},
>+            {"type":"minute","value":"00","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"dayPeriod","value":"AM","source":"endRange"},
>+        ]);
>+    }
>+
>+    {
>+        let fmt2 = new Intl.DateTimeFormat("en", {
>+            year: 'numeric',
>+            month: 'short',
>+            day: 'numeric',
>+            timeZone: 'America/Los_Angeles',
>+        });
>+        shouldBe(fmt2.format(date1), `Jan 10, 2007`);
>+        compareParts(fmt2.formatRangeToParts(date1, date1), [
>+            {"type":"month","value":"Jan","source":"shared"},
>+            {"type":"literal","value":" ","source":"shared"},
>+            {"type":"day","value":"10","source":"shared"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"year","value":"2007","source":"shared"},
>+        ]);
>+        compareParts(fmt2.formatRangeToParts(date1, date2), [
>+            {"type":"month","value":"Jan","source":"shared"},
>+            {"type":"literal","value":" ","source":"shared"},
>+            {"type":"day","value":"10","source":"shared"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"year","value":"2007","source":"shared"},
>+        ]);
>+        compareParts(fmt2.formatRangeToParts(date1, date3), [
>+            {"type":"month","value":"Jan","source":"shared"},
>+            {"type":"literal","value":" ","source":"shared"},
>+            {"type":"day","value":"10","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"day","value":"20","source":"endRange"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"year","value":"2007","source":"shared"},
>+        ]);
>+    }
>+    {
>+        const date1 = new Date("2019-01-03T00:00:00");
>+        const date2 = new Date("2019-01-05T00:00:00");
>+        const date3 = new Date("2019-03-04T00:00:00");
>+        const date4 = new Date("2020-03-04T00:00:00");
>+
>+        let dtf = new Intl.DateTimeFormat("en-US");
>+        compareParts(dtf.formatRangeToParts(date1, date1), [
>+            {"type":"month","value":"1","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"day","value":"3","source":"shared"},
>+            {"type":"literal","value":"/","source":"shared"},
>+            {"type":"year","value":"2019","source":"shared"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date1, date2), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"3","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"2019","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"1","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"5","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"2019","source":"endRange"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date1, date3), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"3","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"2019","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"3","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"4","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"2019","source":"endRange"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date1, date4), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"3","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"2019","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"3","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"4","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"2020","source":"endRange"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date2, date3), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"5","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"2019","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"3","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"4","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"2019","source":"endRange"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date2, date4), [
>+            {"type":"month","value":"1","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"5","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"2019","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"3","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"4","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"2020","source":"endRange"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date3, date4), [
>+            {"type":"month","value":"3","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"day","value":"4","source":"startRange"},
>+            {"type":"literal","value":"/","source":"startRange"},
>+            {"type":"year","value":"2019","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"3","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"day","value":"4","source":"endRange"},
>+            {"type":"literal","value":"/","source":"endRange"},
>+            {"type":"year","value":"2020","source":"endRange"},
>+        ]);
>+
>+        dtf = new Intl.DateTimeFormat("en-US", {year: "numeric", month: "short", day: "numeric"});
>+        compareParts(dtf.formatRangeToParts(date1, date1), [
>+            {"type":"month","value":"Jan","source":"shared"},
>+            {"type":"literal","value":" ","source":"shared"},
>+            {"type":"day","value":"3","source":"shared"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"year","value":"2019","source":"shared"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date1, date2), [
>+            {"type":"month","value":"Jan","source":"shared"},
>+            {"type":"literal","value":" ","source":"shared"},
>+            {"type":"day","value":"3","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"day","value":"5","source":"endRange"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"year","value":"2019","source":"shared"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date1, date3), [
>+            {"type":"month","value":"Jan","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"day","value":"3","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"Mar","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"day","value":"4","source":"endRange"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"year","value":"2019","source":"shared"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date1, date4), [
>+            {"type":"month","value":"Jan","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"day","value":"3","source":"startRange"},
>+            {"type":"literal","value":", ","source":"startRange"},
>+            {"type":"year","value":"2019","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"Mar","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"day","value":"4","source":"endRange"},
>+            {"type":"literal","value":", ","source":"endRange"},
>+            {"type":"year","value":"2020","source":"endRange"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date2, date3), [
>+            {"type":"month","value":"Jan","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"day","value":"5","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"Mar","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"day","value":"4","source":"endRange"},
>+            {"type":"literal","value":", ","source":"shared"},
>+            {"type":"year","value":"2019","source":"shared"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date2, date4), [
>+            {"type":"month","value":"Jan","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"day","value":"5","source":"startRange"},
>+            {"type":"literal","value":", ","source":"startRange"},
>+            {"type":"year","value":"2019","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"Mar","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"day","value":"4","source":"endRange"},
>+            {"type":"literal","value":", ","source":"endRange"},
>+            {"type":"year","value":"2020","source":"endRange"},
>+        ]);
>+        compareParts(dtf.formatRangeToParts(date3, date4), [
>+            {"type":"month","value":"Mar","source":"startRange"},
>+            {"type":"literal","value":" ","source":"startRange"},
>+            {"type":"day","value":"4","source":"startRange"},
>+            {"type":"literal","value":", ","source":"startRange"},
>+            {"type":"year","value":"2019","source":"startRange"},
>+            {"type":"literal","value":range,"source":"shared"},
>+            {"type":"month","value":"Mar","source":"endRange"},
>+            {"type":"literal","value":" ","source":"endRange"},
>+            {"type":"day","value":"4","source":"endRange"},
>+            {"type":"literal","value":", ","source":"endRange"},
>+            {"type":"year","value":"2020","source":"endRange"},
>+        ]);
>+    }
>+}
>+
>+if ($vm.icuVersion() >= 64)
>+    test();
>diff --git a/JSTests/test262/config.yaml b/JSTests/test262/config.yaml
>index 2aa9cbbbed303f9173cfec02b9dd6947cb3694f3..4fbfe266267b7d5fa3698ffad8216d6b80266650 100644
>--- a/JSTests/test262/config.yaml
>+++ b/JSTests/test262/config.yaml
>@@ -94,10 +94,6 @@ skip:
>     - test/built-ins/Atomics/sub/bigint
>     - test/built-ins/Atomics/wait/bigint
>     - test/built-ins/Atomics/xor/bigint
>-
>-    # requires ICU APIs implementation
>-    # https://bugs.webkit.org/show_bug.cgi?id=213822
>-    - test/intl402/DateTimeFormat/prototype/formatRangeToParts
>   files:
>     # https://bugs.webkit.org/show_bug.cgi?id=190800
>     - test/built-ins/Object/seal/seal-bigint64array.js
>diff --git a/JSTests/test262/expectations.yaml b/JSTests/test262/expectations.yaml
>index 631e5c9bc9b4da0f4785864bd66dd7e9b341539f..6f3c9f6a37476bf86b41d77f590ba7fa89d0204b 100644
>--- a/JSTests/test262/expectations.yaml
>+++ b/JSTests/test262/expectations.yaml
>@@ -955,6 +955,12 @@ test/intl402/DateTimeFormat/prototype/formatRange/en-US.js:
> test/intl402/DateTimeFormat/prototype/formatRange/fractionalSecondDigits.js:
>   default: 'Test262Error: no fractionalSecondDigits Expected SameValue(Â«02:03âââ02:13Â», Â«02:03 â 02:13Â») to be true'
>   strict mode: 'Test262Error: no fractionalSecondDigits Expected SameValue(Â«02:03âââ02:13Â», Â«02:03 â 02:13Â») to be true'
>+test/intl402/DateTimeFormat/prototype/formatRangeToParts/en-US.js:
>+  default: 'Test262Error: value for entry 5 Expected SameValue(Â«âââÂ», Â« â Â») to be true'
>+  strict mode: 'Test262Error: value for entry 5 Expected SameValue(Â«âââÂ», Â« â Â») to be true'
>+test/intl402/DateTimeFormat/prototype/formatRangeToParts/fractionalSecondDigits.js:
>+  default: 'Test262Error: value for entry 3 Expected SameValue(Â«âââÂ», Â« â Â») to be true'
>+  strict mode: 'Test262Error: value for entry 3 Expected SameValue(Â«âââÂ», Â« â Â») to be true'
> test/intl402/DateTimeFormat/prototype/resolvedOptions/hourCycle-default.js:
>   default: 'Test262Error: Expected SameValue(Â«h24Â», Â«h23Â») to be true'
>   strict mode: 'Test262Error: Expected SameValue(Â«h24Â», Â«h23Â») to be true'

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Attachments on bug 213822: 413573 | 413574 | 413575 | 413576 | 413578 | 413611 | 413657 | 413674 | 413780 | 413783 | 413788 | 413805 | 413862 | 413866 | 413876 | 413883