[wp-trac] [WordPress Trac] #34835: date_i18n() produces invalid output for numerical time zones

[WordPress Trac]

#34835: date_i18n() produces invalid output for numerical time zones
--------------------------+-----------------------------
 Reporter:  Rarst         |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Date/Time     |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 `date_i18n()` only attempts to use `get_option( 'timezone_string' )` for
 timezone information. This option is empty when numerical offset is saved
 as time zone in settings.

 Code to reproduce:

 {{{
 // Kiev
 var_dump( get_option( 'timezone_string' ), get_option( 'gmt_offset' ) );
 // 'Europe/Kiev', 2
 var_dump( date_i18n( DATE_W3C, get_the_date( 'U' ) ) ); //
 2015-12-03T12:22:22+02:00 correct

 // UTC+2
 var_dump( get_option( 'timezone_string' ), get_option( 'gmt_offset' ) );
 // '', '2'
 var_dump( date_i18n( DATE_W3C, get_the_date( 'U' ) ) ); //
 2015-12-03T12:22:22+00:00 wrong
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/34835>
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