=SUMPRODUCT(--(YEAR(A2:A8)=2006),--(MONTH(A2:A8)=12),B2:B8)

--
HTH

Bob

(change the xxxx to gmail if mailing direct)
"Mortir" wrote in message
oups.com...
i have the following case:

DATE Ammount
01.12.06 50
05.12.06 100
12.12.06 200
25.12.06 240
01.01.07 200
15.01.07 210
27.01.07 111
etc...


I would like to SUM the ammounts by month

month ammount
dec. 06 590
jan. 07 521

how do I do that?

thanks!