Userform textbox validation - non-existent date validation

Hey guys,

I am trying to create data validation for a textbox within a userform. However, I am not only looking to validate format text input for this textbox, but also want to prevent users from entering a non-existent date. For example, the data validation would not allow a user to enter the date 06/31/2018.

Thanks!

Maybe this will suffice?

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