Question : differences in date time to include fractional minutes

I am looking to calculate the difference in two dates listed as 1/4/2010  6:15:12 AM and show minutes for just working days

So if I had 1/4/2010  6:15:12 AM and 1/4/2010  6:46:00 AM (which is mm:dd:ss) I want it to show 31 minutes
If I have 6/14/2010 13:34 and 6/15/2010 12:02 I want it to show 1 day 23 hours and xx minutes

I'd like it to show it in dd:hh:mm  (1:23:15) format

I've tried NETWORKINGDAYS - is there something I can nest in that formula or is there another formula that can be used.

I know how to use the datediff function in Access but there is no function like it in Excel 2007.  I would prefer a formula however I would add VBA code - however formula is preferred as it is for another user.

Sample data attached

Thanks
David

Attachments:

david.xls (1.4 MB)  (File Type Details) 

sample data for date diff calculation

Answer : differences in date time to include fractional minutes

Or this: http://office.microsoft.com/en-us/excel-help/calculate-the-difference-between-two-times-HP003056108.aspx