=SUMPRODUCT(--(A1:A20<DATE(YEAR(D1),MONTH(D1),1)),B1:B20)

and

=SUMPRODUCT(--(A1:A20=DATE(YEAR(D1),MONTH(D10),1)),B1:B20)

--
HTH

Bob Phillips

(remove nothere from email address if mailing direct)

"Garth" wrote in message
...
I need to sum the values from an array based on an input in a cell. The
table looks like below

A B

Month PT Basic
Hours Paid

07-2004
08-2004 50
09-2004 100
10-2004 50
11-2004 50
12-2004 50
01-2005
02-2005 75
03-2005
04-2005
05-2005

I want to enter 10-2004 in an input cell and then a formula to return the
sum of hours in previous months ie 150. Another formula should then
return
mth 10-2004 and any following ie 225.

I have tried =SUM(IF(month<G2,basic_hours)) as an array fomula, where G2
is
the cell I entered 10-2004 in but keep getting zero. A is formatted as
text
as is G2

A previous reply did not work.

Thanks for any help