Changing the timezone in a GUI

I expect to be moving to a different time zone in a few months, and wanted to make sure that I can easily change the time zone on my desktop, running F 25 and Xfce. The Time and Date program on my Settings menu didn't run, but I was able to look in with a menu editor and see that the command line was: gnome-control-center datetime Running that from a terminal worked, once. Later that day, I tried again, and it had stopped understanding that argument. Since then, it's not been working. Checking, dnf doesn't recognize the program and rpm -q --whatprovides gnome-control-center returns no results. Presumably, the program's an orphan from an earlier release. I know that I can change the time zone from a CLI with timedatectl, but that's not the issue. Up until recently, I had a working GUI program to deal with this and not only did it stop working for no apparent reason, there doesn't seem to be a replacement. I'm sure that there are many people using Linux on laptops while traveling for business, and not all of them are willing to open a terminal just to change from Pacific to Mountain time, or back. I'm sure that there must be a way to do it, but I haven't found any. Suggestions?