@cstross Reminds me of the hoops I have to jump through to get #iso8601 dates in my #Debian apps via the `LC_TIME` environment variable and a bespoke `en_SE` “English - Sweden” custom locale. https://blog.carsoncheng.ca/2021/03/use-iso-8601-dates-in-pcmanfm-on-debian.html . This was the “easiest” solution I found in 2022 after exploring options to get #Firefox, #Thunderbird, and other apps to display YYYY-mm-dd HH:MM:SS style time stamps.

In #macOS, I think you just modify `System Preferences > Language & Region > Advanced > Dates`.