Hi, can someone help me with this:

the following formula works:

SUMPRODUCT((YEAR(B17:B53)=2005)*(C17:C53))

if I stick in the year in the formula, e.g. 2005 as in above. But when I
reference it to another cell that puts 31/12/2005 I get 0 as an answer. How
do I get it to understand that I am interested in the 2005 bit. I don't know
if I am making myself understood. I want to sume a list of things in a given
year, 2004, 2005, but the year part referenced to another cell that has the
date looking like this 31/12/aaaa

Thanks