I have 2 columns of dates example:

Spud date Completion date
12/01/1952 01/28/1953
04/05/1852 05/24/1852
03/01/1974 04/30/1974
01/01/1898 03/07/1898

I have added the add in to my worksheet. The xdate add in. I cannot get it to work so that I can use the 1800 dates in calculations. Like how many days did it take from spud to completion on a well. 1800 dates continue to be text. I need to know how to get xdate to work properly in my worksheet.

Chessyboy