One way
=SUMPRODUCT(--($C$1:$C$100=DATE(2005,1,1)),$U$1:$U$100)/COUNTIF($C$1:$C$100,DATE(2005,1,1))

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Regards
Roger Govier
"xrayr" wrote in message
...
I have a spreadsheet with columns of data on sheet 1. I would like to have
the average of column "U" determined ONLY when the corresponding data in
Column "C" equals a certain value (date value shown as: "2005/01/01")

I would like this average shown on another sheet that I have termed
"Summary".

I cannot get this to work.

Somebody please help!