# Summing times in a pivot report

#### Mel C Roberts

##### New Member

I have been getting some very funny results from time calculations. After further investigation i have discovered that as soon as the total time gets to 24 hours it reverts to the 24 hour clock and when you then add in another 5 minutes of time the sum total reads 00:05 not 24:05. Then when i am trying to get an average time it is dividing 00:05 by the number of incidents and giving a really small average time.

I have approximately 1300 items in by spreadsheet. And i am trying to calculate an average time for various scenarios using a pivot table.

The raw data is as follows
1) Start time in the format 12-Apr-2002 17:08:00
2) Finish time in the format 12-Apr-2002 17:38:00
3) Total time 1) - 2) = 30:00

Can anyone suggest a way of making sure that when i sum the 1300 items i am getting a running total and not some version of the 24 hour clock - without me having to redo every piece of information?

### Excel Facts

Square and cube roots
The =SQRT(25) is a square root. For a cube root, use =125^(1/3). For a fourth root, use =625^(1/4).
Try number formatting your sum item as [hh]:mm:ss.

Book1
ABCDEFGHIJ
1StartFinishElapsedAverageofElapsedTotal
29/14/0212:209/16/0219:0254:42:13Total241:22:00
39/16/020:289/22/023:22146:54:03
49/17/0217:019/27/0218:33241:32:30
59/19/020:2310/2/0219:28331:05:44
69/20/0210:1710/8/0210:52432:35:28
7
Sheet2

Thanks very much for all your help.
Mission solved.

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