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Excel/subtraction fix amount of days

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Question
Hi.
What is the formula to subtract fix amount of days from a date, excluding Jewish weekends (Friday, Saturday).
For example: May 10 2015 minus 2 days = May 6 2015.
Thanks
Moshe

Answer
Using Excel 2010 or later, format col A as date.

In cell A1, enter

May 10, 2015

In cell A2, enter

=WORKDAY.INTL(A1,-2,7)

In the formula above, the first argument is the start date; the second argument means 2 days prior, and the third argument means Friday/Saturday weekend. For detailed explanation of =WORKDAY.INTL() see

http://www.excelfunctions.net/Excel-Workday-Intl-Function.html
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