Use different time zones on your Linux KDE desktop

I used to marvel at people who required more than one clock, each set to an exotic timezone, on the wall. I saw it mostly in movies, so when I met someone in real life with lots of clocks, it made them seem particularly important, like the leader of a global spy network or a big banking syndicate. And yet lately, I find myself needing to be aware of at least three different timezones on a regular basis. It’s not that I’ve become more important, it’s just that the world has gotten smaller, thanks to technology and remote work.