=SUMPRODUCT(--(A1:A100="07/01/06"+0),--(HOUR(B1:B100)=10))
Sumproduct likes to work with numbers, but the tests above will return
logical values, either True or False. -- will turn the logical values into
numbers, either 1 for true or 0 for false. The first - will make a true -1.
The 2nd will turn the negative 1 to a positive 1. Negating false returns 0
(both times.)

Bob Phillips has a very useful explanation of Sumproduct. Let me dig up the
link ...
http://www.xldynamic.com/source/xld.SUMPRODUCT.html
Also, this link explains the --:
http://www.mcgimpsey.com/excel/formulae/doubleneg.html

--
Kevin Vaughn


"ChristiaanV" wrote:

>
> Out of curiosity, what exactly are the double dashes, and what do they
> do?
>
>
> --
> ChristiaanV
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