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Even the xkcd https://xkcd.com/1179/ https://xkcd.com/1179/ does not mention or gets wrong that yyyymmdd is also right and allowed in ISO 8601. Especially use
by therealmarv 6y ago
Even the xkcd https://xkcd.com/1179/ https://xkcd.com/1179/ does not mention or gets wrong that
yyyymmdd
is also right and allowed in ISO 8601. Especially useful when you add time. You don't e.g. want character ":" in your file name 20210226T205418 (local time here)