[Webkit-unassigned] [Bug 187519] Date constructor with negative value argument

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187519

Alexey Shvayka <shvaikalesh at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |shvaikalesh at gmail.com
         Resolution|---                         |WORKSFORME

--- Comment #2 from Alexey Shvayka <shvaikalesh at gmail.com> ---
(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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