RESOLVED WORKSFORME187519
Date constructor with negative value argument 
https://bugs.webkit.org/show_bug.cgi?id=187519
Summary Date constructor with negative value argument
gfablima
Reported 2018-07-10 08:38:46 PDT
Hi everyone, I found an inconsistence on Date() with a negative value. I was looking on ES6 specification about this issue but I didn't found an answer, maybe the correct way is convert the -0 to +0 as V8 and SpiderMonkey do. Steps to reproduce: ``` d = new Date(-0); print(Object.is(d.getTime(), +0)) ``` Actual results: false Expected results: true V8 and SpiderMonkey works as expected. OS: Ubuntu 16.04 x64 Version: 606.1.9.4
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isol2
Comment 1 2018-07-12 11:33:00 PDT
Daily build v233772 not reproduce this issue
Alexey Shvayka
Comment 2 2020-05-20 14:47:22 PDT
(In reply to isol2 from comment #1) > Daily build v233772 not reproduce this issue r261927 doesn't reproduce this either. (In reply to gfablima from comment #0) > I was looking on ES6 specification about this issue but I didn't found an > answer, maybe the correct way is convert the -0 to +0 > as V8 and SpiderMonkey do. Date constructor (https://tc39.es/ecma262/#sec-date-value) performs TimeClip at step 4.d, which uses ToInteger (https://tc39.es/ecma262/#sec-tointeger) to normalize -0 to 0 (step 2). This is covered by: https://test262.report/browse/built-ins/Date/TimeClip_negative_zero.js https://test262.report/browse/built-ins/Date/prototype/getTime/this-value-valid-date.js https://test262.report/browse/built-ins/Date/prototype/valueOf/S9.4_A3_T2.js (all passed by JSC)
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