[wp-trac] [WordPress Trac] #55242: Time options in Settings have changed to uppercase AM and PM instead of lowercase

[WordPress Trac]

#55242: Time options in Settings have changed to uppercase AM and PM instead of
lowercase
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 Reporter:  leecollings   |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Date/Time     |     Version:  5.9.1
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by pbiron):

 @leecollings welcome back to Trac.

 I might be wrong, but I think you have a plugin installed that is changing
 core's behavior.

 By default, `g:i a`, `g:i A`, and `H:i` are available to be selected and
 the [https://developer.wordpress.org/reference/hooks/time_formats/
 time_formats] filter allows the available options to be changed.  So, I
 suspect you have a plugin (or even your theme) installed that is using
 that filter.

 Can you try deactivating all plugins and switching to one of the bundled
 themes and report back whether you see the `g:i a` option available?

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Ticket URL: <https://core.trac.wordpress.org/ticket/55242#comment:1>
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