Have you tried changing the cell format?
Hi, 2 ways:
1. Go to Number Format and change to mm/dd/yyyy
2. If number stored as text is ok then =TEXT(A1,"mm/dd/yyyy")
You choose the Custom format option, and type in mm/dd/yyyy yourself.
See my previous reply on 1.Not sure on the first one as I don't see mm/dd/yyyy in the Number format but the second one worked.