<?php $punchInTimes = array( '2013-08-01 09:00', '2013-08-02 09:06', '2013-08-03 08:50', '2013-08-04 09:20', '2013-08-05 09:01', '2013-08-06 08:56', ); echo date('H:i', array_sum(array_map(function($v) { $time = date("H:i", strtotime($v)); return strtotime($time); }, $punchInTimes)) / count($punchInTimes));
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