Subtracting Time

I am trying to subtract time. I can get the answer if Start time is 8 am and Stop Time is 4 pm. I can't seem to get the right answer though if the shift works night and Start Time is 10 pm and Stop Time is 6 am. Can someone help with how to subtract time when it goes to next day

including the date

The solution i suggest is the following

in cell "A1" --> 29/06/2015 17:00
in cell "A2" --> 30/06/2015 08:00
Result in cell "A3" --> = A2-A1 then format cell "37:30:55" result "15:00:00"

Daes it fit for your need

Regards

including the date

The solution i suggest is the following

in cell "A1" --> 29/06/2015 17:00
in cell "A2" --> 30/06/2015 08:00
Result in cell "A3" --> = A2-A1 then format cell "37:30:55" result "15:00:00"

Daes it fit for your need

Regards