While metric vs imperial system can be discussed, the date format in American English is probably the worst thing.

In American English, the month always precedes the day. In British English, the month follows the date. This holds no matter whether one writes the date by using numbers only or numbers and words. Note that, in American English, there is a comma before the year, but not in British English. [0]

The only way to cheat both English users is to keep YYYY-MM-DD format, which I have never seen misused.

[0]: https://site.uit.no/english/punctuation/dates/