I need to create a form where one field is expiry month & year (no date) and
set a data validation to ensure that this is current.

I've learnt in other threads that you have to enter date, even if it's a
hypothetical one, and have it not displayed.

This'll work if I'm doing the data entry but it'll have to be made for the
use of other people as well so I'd rather make it simple.

How can I have four digits entered (without "/" or hyphen) to be recognised
as mm/yy, displayed as "mm/yy" (or "mm-yy") and have the record validated to
ensure that it is future month/year?

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Maki @ Canberra.AU