[Webkit-unassigned] [Bug 239778] New: Datetime-local Field Picker Shows Incorrect Date

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239778

            Bug ID: 239778
           Summary: Datetime-local Field Picker Shows Incorrect Date
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: me at curtisherbert.com
                CC: cdumez at apple.com, wenson_hsieh at apple.com

Created attachment 458380

  --> https://bugs.webkit.org/attachment.cgi?id=458380&action=review

Preview of bug

It seems the datetime-local field type has a bug where if the seconds end in :00, when you click into the field and it shows the calendar popup it defaults to Dec 2000 w/ Jan 1 2001 selected. If you use any seconds beyond :00, it works fine.

JSFiddle attached, example uses `<input type="datetime-local" value="2017-05-12T19:30:00" step="1">` to show the error.

https://jsfiddle.net/vwyk05gj/

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