COUNTIF on dates

Hi,

I have two different worksheets.

One has dates recorded as dd-mmm-yyyy (e.g., 28-Nov-2009).

On the other, I have to create a lot (over 1000) of countifs against the months/years of these dates. So, for example, if there are several dates on the first workbook that fall in Nov-09, i want to do a countif on the second workbook that tells me how many Nov-09 dates there are.


Since I have to create so many of these, however, I'd like to make the countif formula simple enough to copy and drag.

Any ideas?