Revenue Rank & Date Calculations

Hi all,

This is on the same project as I was discussing in this thread:

http://www.excelforum.com/excel-work...ml#post2052648

But a new problem!

I need to work out Revenue Rank & Year to Date calculations.

Consider a simple table:

| Partner Name | Year | Month | Revenue |
------------------------------------------
| John Smith | 2008 | Nov | 2000 |
| John Smith | 2008 | Dec | 2200 |
| John Smith | 2009 | Jan | 1898 |
| Mary Smith | 2008 | Nov | 1767 |
| Mary Smith | 2008 | Dec | 1867 |
| Mary Smith | 2009 | Jan | 1953 |
------------------------------------------
etc..etc...

I'm not using Pivot Tables since there are more complex issues around presentation which are preventing me doing this so are using good old formulas..

Revenue Rank is in reference to the Partner in this case. I need to be able to say John Smith is rank x out of xx by summing up his revenues for both:

a) one month
b) a range of 3 months back

How do I work this out? Especially the date calculations when I just have a year and month in separate fields?

Many thanks in advance!