Working in the LTC means working with people spread around the globe. Or at least at a few different timezones…
I just found out about this feature in KDE which I suspect will become very handy for me from now on: have the taskbar’s clock show the time in different timezones:

To enable it, just right-click on the clock, select “Configure Clock…” and then the “Timezones” tab.
GNOME, of course, has the same feature. That’s how I had the idea to search for this in the first place…