Laravel 5 Time Difference

I have an application which on sign in records in time and on sign out records out time.

My table has IN_TIME & OUT_TIME

Example of data within those columns:

IN_TIME = 16:06:46

OUT_TIME = 16:08:07

I have a controller which to my blade template file is showing all attedances for a given person, what I want to do is show the time difference between the two.

See below my current code which currently shows 0

**Time onsite:** {{ date('G:i', strtotime($attrec->out_time)) - date('G:i', strtotime($attrec->in_time)) }}

Is there a reason why I can't get the right figure?

via Chebli Mohamed