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$t0=mktime(
            preg_replace("/^....\-..\-..\ (..):..:..$/","$1",$task['end_date']),
            preg_replace("/^....\-..\-..\ ..:(..):..$/","$1",$task['end_date']),
            preg_replace("/^....\-..\-..\ ..:..:(..)$/","$1",$task['end_date']),
            preg_replace("/^....\-(..)\-..\ ..:..:..$/","$1",$task['end_date']),
            preg_replace("/^....\-..\-(..)\ ..:..:..$/","$1",$task['end_date']),
            preg_replace("/^(....)\-..\-..\ ..:..:..$/","$1",$task['end_date'])
        );

        $t1=mktime(
            preg_replace("/^....\-..\-..\ (..):..:..$/","$1",$task['real_end_date']),
            preg_replace("/^....\-..\-..\ ..:(..):..$/","$1",$task['real_end_date']),
            preg_replace("/^....\-..\-..\ ..:..:(..)$/","$1",$task['real_end_date']),
            preg_replace("/^....\-(..)\-..\ ..:..:..$/","$1",$task['real_end_date']),
            preg_replace("/^....\-..\-(..)\ ..:..:..$/","$1",$task['real_end_date']),
            preg_replace("/^(....)\-..\-..\ ..:..:..$/","$1",$task['real_end_date'])
        );

        for($i=$t0;$i<=$t1;$i=$i+(60*60))
        {