I use YY/MM/DD, especially in filenames, because they are are easy to sort into chronological order.

nostr:nevent1qqsytc5g80np7zmqe7v7tledmrlf2qm2qdrahwpssw88qkkc804pg8gpzemhxue69uhkummnw3ex2mrfw3jhxtn0wfnj7q3qgluh6ns2vsxg493a87n3m8c2d2ketzh62p07lhkad4ffaaqj9mesxpqqqqqqzp3qlze

The only one that does not make any sense is MM/DD/YYYY

Yes!

YYYY-MM-DD is the only sane option.

nostr:nevent1qqsytc5g80np7zmqe7v7tledmrlf2qm2qdrahwpssw88qkkc804pg8gpzemhxue69uhkummnw3ex2mrfw3jhxtn0wfnj7q3qgluh6ns2vsxg493a87n3m8c2d2ketzh62p07lhkad4ffaaqj9mesxpqqqqqqzp3qlze

Japan still makes sense. MM/DD/YY is completely retarded.

This is the convention I use to name files. The most recent iteration is always the most recent date. It's also how I keep track of coffee lots.

#ISO8601 is the only true date format.