Date math again...

[Kenneth Brody]

Quoting Butch Ammon (Wed, 4 Jan 2006 14:07:08 EST):

> Good afternoon,
>
> I have another question regarding dates, calculations, and taking into
> account weekend dates.  Isn't there a simple way of doing this?
[...]
> My main question:  Does anyone have a quick and easy method of doing
> date math and taking into consideration the weekends inbetween the two
> dates?
[...]

Assuming you want an inclusive range (ie: including both the start and
end dates), you really want start-end+"1".

If the difference between two dates is 7x+y, then there will be precisely
2x weekend days in the first x weeks.  Now, all you need to do is figure
out how many weekend days are in the last y days.

If DOW(start) is greater than DOW(end), then there are two weekend days,
as the last partial-week spans the weekend.  Otherwise, if the start or
end date is a weekend (DOW is 0 or 6), then they are weekends. Otherwise,
there are no weekend dates in the last partial-week.

Of course, this doesn't take holidays into account.

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