[wp-trac] [WordPress Trac] #37910: Remove confusing legacy logic in date_i18n()

[WordPress Trac]

#37910: Remove confusing legacy logic in date_i18n()
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 Reporter:  jdgrimes                    |       Owner:  SergeyBiryukov
     Type:  enhancement                 |      Status:  reviewing
 Priority:  normal                      |   Milestone:  4.7
Component:  Date/Time                   |     Version:  3.0
 Severity:  normal                      |  Resolution:
 Keywords:  has-patch needs-unit-tests  |     Focuses:
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Comment (by swissspidy):

 [attachment:37910.2.diff] adds some initial tests

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Ticket URL: <https://core.trac.wordpress.org/ticket/37910#comment:6>
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