I have a table of monthly data for 2008. Monthly columns are empty until
month end data is available, except for the top row which contains the month
names Jan thru Dec.

How do I write a function to place the Excel Column Letter in a cell to
identify the monthly column having the most recent data. If the top cell in
a column is non-blank, then that column, and all before will complete.

Hope this description is clear. Thx for your help, John