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(Date d2, Date d1)
Returns the number of weekdays in the interval starting with d1 and ending on the day before d2 (same as subtracting Dates, but the result is the number of weekdays instead of a Duration). It is the inverse of WeekdayAdd.
WeekdaySub([Finish], [Start]) returns the number of weekdays between the dates in the Start and Finish fields. WeekdaySub(ToDate("6/24/2003"), ToDate("6/20/2003") ) returns 2