I'd like to be able to enter today's date into a cell in Excel. Doesn't
sound too hard, does it? Except, I'd like to be able to leave the date as it
was the next time I open the file and not have Excel update the damn thing to
the current date. It still doesn't sound too hard, does it? I want to be
able to detect data being entered into one cell and put the date the data was
first entered into another as some sort of audit trail without the date
changing every time I look at it. I cannot find a function to do this
(seemingly) simple task; am I missing something?

Thanks in advance for any help, just in case I am.