A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Akramul,
Just for information (if you are proficient at VBA), VBA is a separate product and does not use the Excel Date algorithms. In VBA, a data variable can represent dates between: January 1, 100 to December 31, 9999
So you could always build your own User Defined Function in VBA if you have those skills. I would guess that is what John Walkenbach has done in his Addin.
--
Regards,
Tom Ogilvy