I assume your dates are in A9 and C9, so let's start with the simplest
expression and put this in G9 for the days:

=IF(DATEDIF(A9,C9,"md")=15,0,DATEDIF(A9,C9,"md"))

It will return 0 if there are more than 14 days difference.

Now put this in E9:

=IF(DATEDIF(A9,C9,"ym")
+IF(DATEDIF(A9,C9,"md")=15,1,0)=10,0,DATEDIF(A9, C9,"ym")
+IF(DATEDIF(A9,C9,"md")=15,1,0))

We have to take account of any carry forward from G, and if the number
of months is greater than 9 then this will show 0.

Finally, put this formula in D9:

=DATEDIF(A9,C9,"y")+IF(DATEDIF(A9,C9,"ym")
+IF(DATEDIF(A9,C9,"md")=15,1,0)=10,1,0)

This takes account of any carry forward from E.

You will need to apply similar logic for the overall totals.

Hope this helps.

Pete

On May 2, 7:39*pm, lampatmyfeet
wrote:
I need to compute the number of years, months and days between dates. *After
doing so: *if days = 15 then add 1 to month and days becomes 0, then if
months 9 add 1 to year and then months becomes 0.

I will need to do this for several rows and them sum up the individual columns

My format is as follows:

* A * * * * * *B * * * * *C * * * * D * * *E * * * * * *F * * * * * * G
Date 1 * *thru * *Date 2 * * = * * *yy * * * * mm * * * * *dd * *
Date 3 * *thru * *Date 4 * * = * * *yy * * * * mm * * * * *dd
.
.
.
* * * TOTAL * * * * * * * * * * * * * * YY * * * * *MM * * * * * DD

the numbers is columns E,F & G are the differances between dates 2 and 1
Date X is formated at follows mm/dd/yyyy

I have tried several formulas but seem to leave out some component. *My
latest iteration for computing years is
=YEAR(C9)-YEAR(A9)-IF(OR(MONTH(C9)<MONTH(A9),AND(MONTH(C9)=MONTH(A9), DAY(C9*)<DAY(A9))),1,0)&""
but this formula will not allow me to total the column and the problem is
the same for the months and day columns.

Any help?
--
LAMP