See

http://www.mcgimpsey.com/excel/timestamp.html

If it needs to be a function statement, you'll need to use the circular
reference method.

In article ,
Jim Dean wrote:

Hi Guys

I need to get excel to enter to-days date and then freeze this date so is
does not update later. I dont want to copy-paste special-values. I need to
have it in a function statement.
I tried =IF(C17="not completed","",TEXT(TODAY(),"d/mm/yyyy;@"))

but it still updates even though the cell format is text.

Bob Phillips was helpfull byt it still doesnt work

Any other suggestions please?

Thanks.