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I am suppose to let the user enter a DateTime format, but I need to validate it to check if it is acceptable. The user might enter “yyyy-MM-dd” and it would be fine, but they can also enter “MM/yyyyMM/ddd” or any other combination. Is there a way to validate this?
I don’t know of any way to actually validate the format they enter since sometimes you want to intentionally include characters that translate into anything. One thing you might consider is allowing the user to self validate by showing a preview of what their entered format translates into.