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.
American here, that didn’t expire on February 29th, it will expire on the second of Viginti-September. Easy mistake to make.
Viginti-September 2 is my birthday!