Tip

Calc # Or Working (Week) Days Between Two Dates

This formula will calculate the number or working (week) days between any two
dates.
StartDate is the early date and EndDate is the ending date (obviously). This
will not take any holiday/vacation days into account. You could add extra code
to access a holiday schedule and add that into the calculation.
diffDays := (EndDate - StartDate) / 86400;
strtDay := @Modulo(@Weekday(StartDate); 7);
endDay := @Modulo(@Weekday(EndDate); 7);
weekdays := (diffDays - endDay + strtDay - 7) * 5 / 7 - @Max(-2; -strtDay) -
@Min(1; endDay) + 5 - strtDay + endDay

This was first published in November 2000

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