Working with dates and time

I

Inca

I need to calculate the elapsed time in hours from data in 4 date and time
columns (date dd/mm/yyyy format and time in 24 hour format) e.g.

Start Date Start Time Stop Date Stop Time
10/12/2008 15:10 13/12/2008 12:50
11/12/2008 02:00 11/12/2008 16:30
11/12/2008 10:10 13/12/2008 09:00

I need to then be able to find the average elapsed time in hours.

Manually the solution for the above is:

69:40
14:30
46:50
Average elapsed time: 43:40

As I am not used to working with date and time fields, any help would be
much appreciated as I have several hundred lines of data and manually
calculating this would drive me nuts.

~John
 
T

T. Valko

Try this array formula** :

=AVERAGE((C1:C3+D1:D3)-(A1:A3+B1:B3))

Format the cell as [h]:mm

** array formulas need to be entered using the key combination of
CTRL,SHIFT,ENTER (not just ENTER)
 
I

Inca

Thanks to all who gave me feedback. Much appreciated. This has solved my
problem and have saved me heaps of time.

~John
 

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