187519 2018-07-10 08:38:46 -0700 Date constructor with negative value argument 2020-05-20 14:47:22 -0700 1 1 1 Unclassified WebKit JavaScriptCore Safari 11 Unspecified Unspecified RESOLVED WORKSFORME P2 Normal --- 1 gfablima webkit-unassigned ashvayka isol2 msaboff oldest_to_newest 1440845 0 gfablima 2018-07-10 08:38:46 -0700 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 1441598 1 isol2 2018-07-12 11:33:00 -0700 Daily build v233772 not reproduce this issue 1654651 2 ashvayka 2020-05-20 14:47:22 -0700 (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)