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Yes that tripped me up a few times.

I’d also suggest that when the user guesses wrong and you show the “correct” working, also continue to show the date so they can work it through correctly. The date changes right away so you can’t rework it and understand your mistake.

There are only two dates that aren't symmetrical - 3/14 and 2/28 - and they are easier to remember in the mm/yy format.

It’s actually what put me off.