calculation of month inteval

[Elwin]

DateDiff("m",#1/31/2004#,#2/29/2004#)
DateDiff("m",#1/31/2004#,#2/1/2004#)

both of these return 1

the 1st parameter can be;
y = year
m = month
d = day
h = hour
n = minute
s = second

-----Original Message-----
looking to calculate interval between two dates down by

month at the fraction of a month interval.