time difference not working on server in php

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PHP

Dear Friends

i want to get the time difference with the help of my code working fine on local server but it gives wrong result when i use it to server please tell me what is the problem

<?php

$first=$status['in_time']."".$status['am_time'];
$second=$status['out_time']."".$status['pm_time'];
$d1=  strtotime($first);
$d2=  strtotime($second);
$diff=$d2-$d1;
//echo $diff;
echo date("H:i",$diff);
?>