"Ken Wright" wrote in message
...
As Peo pointed out in another post:-

For January you need to add another condition

=SUMPRODUCT(--(MONTH(A1:A100)=1),--(ISNUMBER(A1:A100)))

it's because that excel sees blank cells as zero and excel dates dtart
with
January zero 1900 the unary minuses will convert boolean values of true
and
false to 1 and 0

http://www.mcgimpsey.com/excel/formulae/doubleneg.html

--
Regards
Ken....................... Microsoft MVP - Excel
Sys Spec - Win XP Pro / XL 97/00/02/03

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Thank you very much. I hadn't come across this before. It makes sense.
Thanks

Ron