ISO8601-based custom date format in Linux Mint
Right-click the calendar widget in the panel > toggle Use a custom date format > Add %Y-%m-%d%n%H:%M% to the field below.
Seconds omitted because I don't have use for them, and %n to put the hours and minutes in a second line, so it's easier to read.
Didn't test in other Debian-based systems. And iirc changing the locale to either Danish or Japanese also works, but then the system won't be in English.
Hope this helps someone. =)
"RFC 3339 vs ISO 8601 vs HTML"
https://ijmacd.github.io/rfc3339-iso8601/
Includes table with supported formats, a test file generator and a format checker! #iso8601 #RFC3339 #html
Oh, ich mag aktive online Kalender/Uhren und diese Seite hier zeigt aktuelles Tagesdatum und Uhrzeit in diversen Zeitsystemen an, zuoberst modifizierte Julianische Tageszahl:
Sieht vom Design her ziemlich nach Claude Opus aus, wenn ich mal meine eigene Kreation (metrischer Kalender/Uhrzeit) daneben halte: