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Oct 29, 2013 7:58 AM in response to theiliby SGIII,★HelpfulHi Theili,
There are a number of threads about this problem. It has something to do with Numbers 3.0 "smart" recognition of dates in languages other than English. It's too smart, not with the SUMIF function.
One workaround (assuming you don't want to switch your language to English) that apparently has yielded some success for some users is to go to cells where the month names appear and type a space after each the month names.
SG