[Webkit-unassigned] [Bug 161623] New: toLocaleDateString() resolves incorrect date for some old dates

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161623

            Bug ID: 161623
           Summary: toLocaleDateString() resolves incorrect date for some
                    old dates
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: medikoo+webkit.org at medikoo.com

Running following:

(new Date(1969, 8, 26)).toLocaleDateString()

Results with:

"9/25/1969"

While it should result with:

"9/26/1969"

It goes up to around 1977:

> (new Date(1977, 8, 26)).toLocaleDateString()
< "9/25/1977"
> (new Date(1978, 8, 26)).toLocaleDateString()
< "9/26/1978"

Same issue affects V8, although it gets dates after 1970 right -> https://bugs.chromium.org/p/v8/issues/detail?id=5353
No such issue is observed on Firefox.

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