Just to add to onedtent's reply, you will also need to format the cell with the calculation in it (eg =c2-b2)to 'number' format which will give you the number of days between the two dates.
You can also look at it in terms of years, months & days too using Datedif worksheet function
Try putting this formula in, again with your dates in a1 (oldest date) & a2 (newest date) to see what I mean.
=DATEDIF(A1,A2,"Y"&" Years and "&DATEDIF(A1,A2,"YM"&" Months and "&DATEDIF(A1,A2,"MD"&" Days"
Another extra note - NETWORKDAYS is only available if you have installed the analysis toolpak (Tools>Addins>Analysis Toolpak) Rgds
Geoff "Some cause happiness wherever they go; others whenever they go."
-Oscar Wilde
Free Addin tho - should be there and available - you just need to go to Tools>Addins and select it from the list Rgds
Geoff "Some cause happiness wherever they go; others whenever they go."
-Oscar Wilde
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