Have you formatted the column as date first?

"jco" wrote:

I am using Windows 2007. In my database, the date (month and year) is a
column header. In the formula, if I enter the field in "" as "10/1/2009", or
"Oct-09", I get #VALUE!. However, if I enter the field as "40087", the
formula returns the correct result. Has anyone come up with this and know a
way around? I can come up with the number equivalent of each date, but since
I am not the end user of this file, it would be easier to be able to enter
the date.