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=SUMPRODUCT(--(I6:I250<DATE(2009,1,1)),--(ISNUMBER(I6:I250)),J6:J250)
I am using this formula to calcuate the number of square footage with an expiration date less than 1/1/09 (some of the cells contain the value "month-to-month"). I now need to write this same formula for expiration dates between 1/1/09 and 6/30/09. How do I get multiple date parameters - I keep getting errors trying to use the AND function. |
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