I have a worksheet with a beginning and ending date range. I need the number
of months for the range but also need them rounded up to the next month.

For example:

13-Jul-11 to 31-Jul-12 should calculate as 13 months and not the 12 provided
by the DATEDIF function.

In short, I need to round up to the next month for my calculations.

05-Mar-11 to 31-Dec-11 should return 10 full months and not 9.

Is there an easy way to do this?