Thanks All. Reversing the formual was the solution.

Thanks Much!
John


"JohnH" wrote:

I'm using Excel 2000 and trying to use the datedif function. I've formated 2
columns as date m/dd/yyyy and left the formula column general I'm entering
dates
A1: 1/1/2002
B1: 1/1/2005

I'm entering the formula in C1
=datedif(b1,a1,"M")

I'm looking for the nmber of months between 2 dates

I get #NUM! for a result.

Thanks
John