How to get number of WORKDAYS between two dates in SharePoint calculated column
I need to count the number of WORKING days between two dates in a calculated column in SharePoint 2007. Does anyone know of a formula to do this? I know that "=DATEDIF(Column1, Column2,"d")" provides the total number of days, but the customer wants only the number of WORKING days, i.e. M-F. Excel has a formula for it...can't seem to find one for SharePoint though. Anybody?
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I think they're going to work. Just having some trouble getting my formulas to ignore empty date fields and invert dates that end up being negative numbers. It's not always a start/end date, but the days between two board meetings which can occur before or after each other, i.e., board1 convenes on 2/1/11 and board2 convenes on 3/1/11 for item 1, but board1 convenes on 4/1/11 and board2 convenes on 3/1/11 for item 2. The formula for item 2's calculated column gives me a #NUM! error because the returned value is less than 0. Anyway, that wasn't part of my question and your answer does what I asked, so points to you! Thanks!