Hi Ko Be,
Diligently I'm attempting to understand what is you're desired outcome is to be, but, I'm not completely sure. Would you be so kind as to further explain exactly what your wanting, and show the exact outcome you expect.
Using your example: In the cell formated as date only cell, when I enter the number, 5, it returns 01/03/04.
I look forward to your reply.
Sincerely,
RicD