This used to be straightforward if you found your way into the internationalization formats and modified the right ones. It's no longer straightforward, see:

This used to be straightforward if you found your way into the internationalization formats and modified the right ones. It's no longer straightforward, see: https://apple.stackexchange.com/questions/463901/customising-the-system-locale-s-date-format-in-recent-macos-versions https://apple.stackexchange.com/questions/463901/customising... Which in turn points to: https://discussions.apple.com/thread/254316210?sortBy=best https://discussions.apple.com/thread/254316210?sortBy=best