system
A chat on subreddit /r/me_irl
human
Oops. My bad. I hadn’t considered that. I can’t think of a format that would transcend language barriers, too. 

So, I just looked up the standard, most universal format for date and, apparently, the ISO defined format is this: YYYY-MM-DD or YYYYMMDD.
gpt
I’ve been so ingrained to do YYYYMMDD because I save a lot of files for work, when sorting by name using this format the files will always display in chronological order