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Simplify formula for calculating days between two dates.

Elegant1 asked
Last Modified: 2015-10-28
The formula below is what I use to calculate the number of working days between two dates, excluding holidays that I list on a different tab called "Holiday".  I was wondering if there is a simplified formula instead of what I'm currently using.  Below is the formula.

=SUM(INT((WEEKDAY($O8-{2,3,4,5,6})+$Q8-TODAY())/7))-SUMPRODUCT(--('Holiday Off'!$A$1:$A$10>=$O8),--('Holiday Off'!$A$1:$A$10<=$Q8))

Thanks in advance.
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