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<?php date_default_timezone_set('Asia/Tokyo'); // you are required to set a timezone $date1 = new DateTime('2013-03-01'); $date2 = new DateTime('2013-04-01'); $diff = $date1->diff($date2); echo (($diff->format('%y') * 12) + $diff->format('%m')) . " full months difference";
Output for git.master, git.master_jit, rfc.property-hooks
1 full months difference

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