Check if a cell contains a date?

Hello,

I'd like to set up a cell to indicate which format EXCEL has picked for the value in another cell. This is fairly straightforward for numbers and text because MS provides the ISTEXT and ISNUMBER functions. However, there is no ISDATE function and all dates are stored as numbers in EXCEL of course.

Now, the manual indicates that there is a VB function called IsDate, but I'd prefer not to be writing VB for this little project.

Any ideas how to check the format of a cell?