Krit, have a look here
http://www.mcgimpsey.com/excel/udfs/sequentialnums.html

--
Paul B
Always backup your data before trying something new
Please post any response to the newsgroups so others can benefit from it
Feedback on answers is always appreciated!
Using Excel 2002 & 2003

"Krit Kasem" <Krit wrote in message
...
I try to design my own form. I want one of the cell to show today date
automaticly everytime I open my template. And I want one of another cell
to
assign number automaticly like invoice no.