After spending much time trying to find a nice way to calculate a decimal
value for number of months for use in protrating calculations I've come up
with this fairly simple and short way. Compared to what I've seen on the net
this seems quite simple, as long as you have the extra excell plugin added
to get the extra functions (if needed).

so...

IF a date is in CELL C2 and the end date is "31/03/04" as seen in formula...
DATEDIF(C2,"31/03/04","M")+(DATEDIF(C2,EOMONTH(C2,0),"D")+1)/TEXT(EOMONTH(C2
,0),"DD")

DATEDIF(C2,"31/03/04","M") ,,,,is the # of full months to date (im
assuming an end of month date)
DATEDIF( C2,EOMONTH(C2,0),"D" ) + 1 ,,, is the # of days let in the month
+1 since I want to count the starting day.
TEXT(EOMONTH(C2,0), "DD") ,,,, is a quick way of getting the total number
of days in the start month.
Using CEILING( BLABLABLA, 0.01) you can get some rounding the way you
want...

EOMONTH() may require a plugin added from the plugin menu of excel.

[A LONG example with error checking]

=IF( ISERROR( CEILING(
DATEDIF(C2,"31/03/04","M")+(DATEDIF(C2,EOMONTH(C2,0),"D")+1)/TEXT(EOMONTH(C2
,0),"DD"), 0.01) ), "???", CEILING(
DATEDIF(C2,"31/03/04","M")+(DATEDIF(C2,EOMONTH(C2,0),"D")+1)/TEXT(EOMONTH(C2
,0),"DD"), 0.01) )


---bla
email: [danielm at citenet dot net ]dot why are you reading this?