A date is just a number to Excel, so you could use this in A5:

=IF(ISNUMBER(A4),A4-30,"NA")

However, you could put any number in A4 (like 10) to fool this. A date
of 1st Jan 2008 has a serial value of 39448 (the number of elapsed
days since 1st Jan 1990), so if your dates are meant to be quite
recent you could also check for the value, eg:

=IF(ISNUMBER(A4),IF(A439400,A4-30,"NA"))

Hope this helps.

Pete

On Jul 23, 7:52*pm, bigbird98
wrote:
I want another cell to evaluate if there is a date (of any kind) in another
cell. *If there is then I want the formula to place the date minus 30 days. *
If there's not, then I want it to say "NA".

Ex:
Cell A4 can have, "OK", "Overdue", or physically input a date. *Cell A5 will
be A4-30, if there is a date. *If there is not then A5 will read "NA".

Thanks