[Webkit-unassigned] [Bug 240047] New: Date times do not respect the system's 12/24-hour time format override

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240047

            Bug ID: 240047
           Summary: Date times do not respect the system's 12/24-hour time
                    format override
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: reingator at gmail.com

Created attachment 458766

  --> https://bugs.webkit.org/attachment.cgi?id=458766&action=review

Screenshot showing the system's Language & Region setting and bug in STP

With a 12-Hour time region like United States, when formatting a date with .toLocaleTimeString(), the result is a 12-Hour time even if the system is set to 24-Hour. Conversely, if your region does normally use 24-Hour time, like Germany, having the 24-Hour time format disabled is not reflected in the date time.

The same follows for the "time" input type, but only on macOS. iOS and iPadOS both render this correctly with the overriding setting.

To test on macOS, go to System Preferences > Language & Region and check the 24-hour time format if in a 12-hour time region or uncheck it if in a 24-hour region. On iOS/iPadOS go to Settings > General > Date & Time and enable or disable 24-Hour time.

Run `(new Date()).toLocaleDateTimeString()` in the console and render `<input type="time" />` in HTML.

Both should reflect the system's 24-hour time override setting, but do not.

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