[wp-trac] [WordPress Trac] #48623: WP 5.3 time problem causes day number shifts in permalinks

[WordPress Trac]

#48623: WP 5.3 time problem causes day number shifts in permalinks
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 Reporter:  steevithak    |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  5.3.1
Component:  Date/Time     |     Version:  5.3
 Severity:  major         |  Resolution:
 Keywords:                |     Focuses:
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Comment (by Rarst):

 I did a quick check and under normal circumstances `date()` and `gmdate()`
 calls in that place are equivalent. As they should be.

 If they are not please double check that your default PHP timezone
 (`date_default_timezone_get()`) isn't modified from UTC, which WP sets it
 to on boot.

 This might be a case where two bugs compounded to "correct" result, but
 now that ''one'' of them is fixed it's breaking.

 @archon810

 Ah, and the evidence trickling in. :) Do not use
 `date_default_timezone_set()` in WordPress, it's broken and had always
 been.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48623#comment:15>
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