Excel doesn't support this kind of masking.

Maybe you could use some calendar controls instead?

Ron de Bruin has some notes:
http://www.rondebruin.nl/calendar.htm

TotallyConfused wrote:

How do I apply a date "mask" in an Userform textboxes. I have a lot of date
textboxes and want to make sure users do not enter anything else but date in
the textbox. Thank you in advance for any help you can provide.

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Dave Peterson