i have two time like total worked time and total duty time. eg.
$dutyTime= 182:00:00; ("H:i:s")  
$workedTime= 178:10:28; ("H:i:s")  
my question is that how can i get difference between this two time;
Expected Output
$duration=03:49:32; ("H:i:s")
i tried strtotime() but i takes upto 24hrs.
 
    