YYYY-MM-DD is the only acceptable date format, as commanded by ISO 8601.
YYYY-MM-DD (honestly without dashes) is the only helpful format.
If you name all your files with this as a suffix then your files automatically sort versions of themselves in order when sorting by name.
When you’re naming a file, you can’t use anything else.
DD/MM/YY and YY/MM/DD are the only acceptable ones IMO. Throwing a DD in between YY and MM is just weird since days move by faster so they should be at one of the ends and since YY moves the slowest it should be on the other end.
I’m not kidding when I ask: are there really a lot of people using MM/DD/YYYY??
Almost 350 million of us morons down south of you.
Using a different date format that means the exact same thing anyway does not make you a moron.