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<?php $thirtyOnedayMonths = array( 1, 3, 5, 7, 8, 10, 12 ); $oneMonth = new \DateInterval('P1M'); $format = 'Y-m-d'; foreach($thirtyOnedayMonths as $month){ $date = date($format, strtotime('-1 month', strtotime("2013-{$month}-31 00:00:01"))); var_dump($date); }
Output for git.master, git.master_jit, rfc.property-hooks
string(10) "2012-12-31" string(10) "2013-03-03" string(10) "2013-05-01" string(10) "2013-07-01" string(10) "2013-07-31" string(10) "2013-10-01" string(10) "2013-12-01"

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