Formatting time in a Pivot Table

[Guest]

I have a list of mobile calls made in a month for all the company mobiles.
One of the columns is the duration of the call in the format hh:mm:ss The
formatting for the column is custom hh:mm:ss

This works fine and if I total the column at the bottom I get a total in
hh:mm:ss. But when I create a pivot table and do a sum on this column by
phone I get a number like 771. I want the values to be in hh:mm:ss. I tried
to change the formatting in the pivot table to custom hh:mm:ss but all the
values now read 00:00:00

How can I fix this problem?

 

[Debra Dalgleish]

Right-click on a cell in the call time column
Choose Field Settings
Click Number
Choose the Time category, and the hh:mm:ss format
Click OK, click OK