The answer depends on which version of Excel you are using. For Excel 2007,
you can use Sumifs. For other versions, it's Sumproduct, as in:

=Sumproduct(--(Jan!$F$9:$F$55202="groceries"),--(Jan!$G$9:$G$55202=Date(2010,2,1)),--(Jan!$G$9:$G$55202<=Date(2010,2,8)),Jan!$D$9:$D$55 202)

As an aside, my bet is that using a Pivot Table would make your life a lot
easier.

Regards,
Fred

"Kane" wrote in message
...
Here is my current SUMIF formula. How would I modify this to add the
selection of a date range from the same data columns? Example, start date
of
2/1 and end date of 2/8.

=SUMIF(Jan!$F$9:$F$55202,"groceries",Jan!$D$9:$D$5 5202)