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<?php $arr = array('11-01-2012 10:00', '11-01-2012 11:00', '01-01-2015', '09-02-2013', '01-01-2013'); function date_sort($a, $b) { return strtotime($a) - strtotime($b); } usort($arr, "date_sort"); print_r($arr);

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