[Webkit-unassigned] [Bug 12975] New: Layout test failure: DST changes in US affect JavaScript date calculations

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=12975

           Summary: Layout test failure: DST changes in US affect JavaScript
                    date calculations
           Product: WebKit
           Version: 522+ (nightly)
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: KwhiteRight at gmail.com


According to bug 11157 comment #5,

> According to the spec, history should not take into account what really
> happened but interpolate from a comparable year, where comparable years are
> judged by when Jan 1 happens and if the year is a leap year.
> This will only happen for dates that fall outside of the 1970-2038 range. if
> you fall out of that range then you are offset to a comparable year.
> This is consistent with what most browsers. [sic]

But DST switchover dates just changed in the US, which implies that the
interpolated DST should also change for historical dates.  If we accept that,
then in the fast/js/date-big-setdate.html layout test, April 5 1970 should no
longer show a DST change, and the test is currently passing when it shouldn't.

I don't know if this has been discussed at the JS-spec level.  It remains to be
seen what "most browsers" will do about it.

If the spec stays the same, then the test needs to be changed to use 8-9 Mar
1970 instead of 4-5 Apr, and getDSTOffset() in kjs/DateMath.cpp needs to be
fixed to match.


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