figuring total time

How do i take two times eg. 13:30:34 and 13:31:34 and in a third cell return
the total time that was spent on a call, in this case 1 minute.

12:30:10 and 13:40:20 = 1 hour 10 minutes 10 seconds

Military start time is in cell A1 end time is in cell B1 and total time is
in cell C1.

NOTE: call times can start before midnight and then go into the next day if
that makes a difference to a formula.

Thank You,
Brian

Try:

=(B1-A1+(B1<A1))

"Brian" wrote:

> How do i take two times eg. 13:30:34 and 13:31:34 and in a third cell return
> the total time that was spent on a call, in this case 1 minute.
>
> 12:30:10 and 13:40:20 = 1 hour 10 minutes 10 seconds
>
> Military start time is in cell A1 end time is in cell B1 and total time is
> in cell C1.
>
> NOTE: call times can start before midnight and then go into the next day if
> that makes a difference to a formula.
>
> Thank You,
> Brian