[wp-trac] [WordPress Trac] #51761: Inconsistent displayed date in get_calendar()

[WordPress Trac]

#51761: Inconsistent displayed date in get_calendar()
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 Reporter:  labbit                               |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  Awaiting
                                                 |  Review
Component:  Date/Time                            |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  needs-patch has-screenshots          |     Focuses:
  reporter-feedback                              |
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Comment (by SergeyBiryukov):

 Replying to [comment:5 labbit]:
 > Does it mean we cannot set Local Timezone in wordpress settings?

 No, it's more likely that a plugin or theme changes PHP time zone with
 `date_default_timezone_set()`, which is not recommended. See [46797] /
 #48692 and [https://make.wordpress.org/core/2019/09/23/date-time-
 improvements-wp-5-3/ Date/Time component improvements in WordPress 5.3]
 for more details.

 * Does the issue still happen with all plugins disabled and a default
 theme (Twenty Twenty) activated?
 * Do you have a warning like this in Site Health? "PHP default timezone
 was changed after WordPress loading by a `date_default_timezone_set()`
 function call. This interferes with correct calculations of dates and
 times."

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Ticket URL: <https://core.trac.wordpress.org/ticket/51761#comment:6>
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