You can format it to LOOK like a date but there is no format to actually CONVERT the entry to a date. ie it'll look like a date but you won't be able to apply calculations to it like you would a date
To do this, use a CUSTOM format of
00"-"00"-"0000
To convert to a proper date, you need to use a formula like
=left(a1,2)&"/"&mid(A1,3,2)&"/"&right(A1,4) Rgds
Geoff
"Some cause happiness wherever they go; others whenever they go."
-Oscar Wilde