[Webkit-unassigned] [Bug 188001] New: Erroneous date calculation when daylight savings transition occurs during midnight

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188001

            Bug ID: 188001
           Summary: Erroneous date calculation when daylight savings
                    transition occurs during midnight
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tiagohngl at gmail.com

Steps to reproduce:

- Set your system's timezone to BRT (Brasilia time)
- type in new Date(2018, 10, 4) in the console

Expected result (this is what latest Chrome and Firefox return):
Sun Nov 04 2018 01:00:00 GMT-0200 (-02)

Actual result:
Sat Nov 03 2018 23:00:00 GMT-0300 (-03)

The same thing happens when calling `setHours(0, 0, 0, 0)` on `Nov 04 2018`. It goes back to `Nov 3 2018`.


V8 bug: https://bugs.chromium.org/p/v8/issues/detail?id=3116

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