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<?php $time1 = strtotime('00:00:00 +0000'); $time2 = strtotime('00:00:07 +0000'); $epoch = strtotime('01 Jan 1970'); $diff = $time2 - $time1; var_dump($time1,$time2,$epoch,$diff); $diff = date('H:i:s', $epoch+$diff); echo $diff;

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