this code sample would take hour in $time
and add the hour in $time2
to it
for example: time=06:58:00, time2=00:40:00, result = 07:38:00
$time = "06:58:00";
$time2 = "00:40:00";
$secs = strtotime($time2)-strtotime("00:00:00");
$result = date("H:i:s",strtotime($time)+$secs);