[mso] Re: Custom Date difference
- From: Wilson Baptista Junior <wilson@xxxxxxxxxx>
- To: mso@xxxxxxxxxxxxx
- Date: Wed, 21 Jul 2004 09:21:45 -0300
Hi Robert,
You have to trap and check *any* zero values returned by DATE before using
the DATEDIF function; using the formula I gave you, if there's a zero date,
it means that the day, the month, the year, or any combination of these are
??, so you can't know the exact date by the original data. In your example,
for ????-??-?? DATE is returning a zero value, and a zero date value for
Excel means that the date is 1900-Jan-00, since Excel computes dates
serially by number of elapsed days, starting from the first day of 1900.
With my formula, this will happen whenever day, month or year is
non-numeric (in your case, ??).
Wilson
At 21:05 20/7/2004, Robert Carneal wrote:
>---COPY---
>assuming your dates are in the format YYYY-MM-DD, you can use
> =DATE(LEFT(A1,4),MID(A1,6,2),RIGHT(A1,2))
>(assuming the date is in cell A1) to return the number used by Excel as
>the
>corresponding date.
>To get around the question marks, you might complete the formula as
>such:
>=IF(AND(ISNUMBER(VALUE(LEFT(A1,4))),ISNUMBER(VALUE(MID(A1,6,2)));ISNUMBE
>R(VALUE(RIGHT(A1,2)))),DATE(LEFT(A1,4),MID(A1,6,2),RIGHT(A1,2)),0)
>which will return the date if Year, Month and Day are numeric and return
>
>zero if any of them are not.
>---END---
>
>Whups, problem, at least on my end.
>
>Suppose:
>Birthdate in A1 is "????-??-??"
>Death date in B1 is "1987-03-20"
>
>The formula returns 1900-Jan-00 for the Birthdate in A1.
>The formula returns 1987-Mar-20 for the deathdate in B1
>
>Then, my age formula computes 87 years, 2 months, 0 days. Hmm, any
>suggestions? Would it work if I "trap" the 1900-Jan-00 dates and just
>have it enter "Nondeterministic" for the age?
>
>Thank you.
>
>Robert
>
>
>
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