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<?php $dt = new DateTime(); $dt->setDate(2017, null, 1); echo $dt->format('r');
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: DateTime::setDate(): Passing null to parameter #2 ($month) of type int is deprecated in /in/PWf42 on line 4 Thu, 01 Dec 2016 02:33:31 +0100

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