I originally posted this on the other site back when I took the picture, and it resulted in a lot of confused comments, especially from Americans, eventually getting removed by overzealous mods. Either way, I promise you that this date does not exist, and has never existed.
You’re so close. Even in European date formats, the 29th of February doesn’t exist.
It exists in leap years. 2023, however, wasn’t a leap year.
I understand that… I’m just talking about the users fixating on the date format. Look at all the examples in the comments.