Try one of these:

A1:A20 = dates
B1:B20 = amounts to sum
D1 = start date
E1 = number of days

=SUMIF(A1:A20,"="&D1,B1:B20)-SUMIF(A1:A20,"="&D1+E1,B1:B20)

Format as GENERAL or NUMBER

=SUM(OFFSET(B1,MATCH(D1,A1:A20,0)-1,,E1))


--
Biff
Microsoft Excel MVP


"Adam" wrote in message
...
I have a column of dates (in calendar order3/1/08, 3/2/08, 3/3/08,etc...)
and
a column of corresponding $ amounts next to each date. I need to be able
to
enter a date in a cell and enter a number of days for instance "5" in
another
cell and in a third cell return the sum of $ amount associated with the 5
days starting with the date entered.

Thanks in advance