This is something I really hate in KDE- you choose date/time formats with a dropdown of flags, and it doesn't even give you a preview of the short format, so you have to cycle through hundreds of options and click-click-click each to find what you want, when all that's needed is [Language] + [yyyy-mm-dd HH:MM]* (or whatever) format string.
there are far fewer format options than countries, so this is an exercise in frustration
there are far fewer format options than countries, so this is an exercise in frustration
(*en_SE.UTF-8 btw)