Date & Time Format Issues

If you’re allowing users to enter dates as strings, then that is just asking for trouble.
My first bit of advice would be to avoid that if possible, and use a date picker.

If you don’t want to do that, then my suggestion would be to use a math column to convert the entered “dates” to integers, and then work with those. Use the following:

Year(Date) * 10000
+ Month(Date) * 100
+ Day(Date)

The math column seems to be pretty good at dealing with dates as strings, so you might have better success with that.

The last thing I would use in this situation is the Format Date column. I gave up on that many many months ago, and I just don’t use it at all now. I wrote a bit about why below:

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