[mso] Troubleshooter needed please

I just +cannot+ see my error, and I check all the suggestions in MS's help 
file.

Cell AA100 contains 1938-02-30
Cell AB100 contains 1948-10-24

In cell AC100, I have the formula:
=DATEDIF(AA100,AB100,"y")

Shouldn't that give me "10" (ten) ?

It is giving me the #VALUE error.

All the other dates seem to work and I really am at a loss what to check or 
do to correct it. Datedif doesn't seem to have much coverage in MS's help 
files.

Thank you.

Robert 


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