[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:  critical                  |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Comment (by Rarst):

 > Now, this isn't necessarily a plugin conflict problem, because even when
 date_default_timezone_get() isn't used, PHP still has this configuration
 setting: date.timezone.

 Ini setting is irrelevant to WordPress because it explicitly sets default
 time zone to `UTC` during core load.

 This is absolutely the issue with third party code using
 `date_default_timezone_set()`, which was never supported by WordPress due
 to the way it originally implemented Date/Time calculations. Unfortunately
 this is very old and quite obscure issue, developers are rarely well
 familiar with.

 We are not reverting `gmdate()` change because core-wide it's meant
 exactly to ''prevent'' PHP time zone change breaking things all over. That
 work is just far from complete due to enormous amount of ancient Date/Time
 code in core.

 I have already suggested the patch for `get_permalink()` issue. Please let
 me know if you discover it's lacking to address the problem in some way.

 We wouldn't go with any manipulation of timestamp because the current
 course is to remove and deprecate operating with sums of timestamp and
 offsets in core.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48623#comment:31>
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