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.
Wait, so month comes before day? I’ve been doing it right all along?
The ISO order lets you sort the dates in chronological and alphabetical order at the same time.
It’s the best for, e.g. books on a shelf, files in a folder (on a computer but also IRL), and just generally keeping things organized cleanly.