Mysql timestamps and php date()

use this date('Y-m-d H:i:s',strtotime($date));

Tip : try with MYSQL DATE_FORMAT function

SELECT DATE_FORMAT('2013-02-20 02:25:21', '%H:%i:%s');

if you want to do it only with PHP then use strtotime

 date('H:i:s',strtotime('2013-02-20 02:25:21'));