To use a range of values you can either use sumproduct or use two sumif
calculations. My preference is for the latter:
=sumif(a:a,"=" & date(2005,5,1), b:b) - sumif(a:a,"=" & date(2005,6,1),
b:b).
The first part adds up everything from May 1 and later; the second takes
out everything from June 1 and later, leaving only May activity.
--Bruce

"Space Elf" wrote:

I'm trying to use SUMIF to total a range of numbers. I'd like to get the
results for a particular month but I can't figure out how to use a date range
under criteria. It only seems to let me choose greater than or less than one
date.

Is there a way to use an equivalent criterea argument like 4/30/2005 &
<6/1/2005
in order to add all values in a column when the corresponding date column is
in the month of May 2005?