[Webkit-unassigned] [Bug 172637] REGRESSION(r217458): [Linux] 55 javascript tests are failing after r217458

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172637

--- Comment #3 from Yusuke Suzuki <utatane.tea at gmail.com> ---
(In reply to Yusuke Suzuki from comment #2)
> It seems something goes wrong.
> 
> // Set TZ=America/Los_Angeles
> let date = new Date("May 8 -1");
> print(date);
> 
> "Fri May 07 -001 23:59:02 GMT-0752 (LMT)"
> 
> Maybe, Linux returns wrong value if the year is not within expected ones.
> 
> I dumped some of is_dst and tm_gmtoff * msPerSecond.
> 
> If dst is set,
> 1 -25200000.000000
> 
> If dst is not set,
> 0 -28800000.000000
> 
> That's correct. In the above (-1 year) case,
> 
> 0 -28378000.000000
> 
> That's clearly wrong.
> I think we should recover the previous code for non-darwin environment.

Ah, No! That's more correct. It is Local Mean Time!
Before timezone is introduced, this mechanism is used. And it is replaced with timezone after 1883 Nov 18 12:07:02.
https://github.com/tzinfo/tzinfo-data/blob/master/data/northamerica#L487

But... who wants it?

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