Hello,



Can someone help me with this problem:



A B

1/1/2006 152.3

3/1/2006 156.2

8/1/2006 186.1

5/2/2006 185.2

19/2/2006 145.2

... ..



I need to sum from all data on a monthly base.

Jan : ..

Feb : ...

March : ...



I already tried with a new column C who has the month number and then using
the "Sum. If" function. But can it be done without a extra column just 1
formula per month?




Thx in advance.