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<?php $current = '20130117010101'; $dateString = '20130115000000'; $preserveAfterDate = new DateTime($current); $preserveAfterDate->setTime(0,0,0); $preserveAfterDate->sub(new DateInterval('P5D')); var_dump($preserveAfterDate->format('Y-m-d H:i:s')); $fileDate = new DateTime($dateString); var_dump($fileDate->format('Y-m-d H:i:s')); $difference = $preserveAfterDate->diff($fileDate); var_dump($difference->format('%r%a'));
Output for git.master, git.master_jit, rfc.property-hooks
string(19) "2013-01-12 00:00:00" string(19) "2013-01-15 00:00:00" string(1) "3"

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