No timezones for any location I cannot set any timezone on my Mac. If I go to Date &amp; Time and pick any location I always get empty timezone.

Running:  sudo systemsetup -listtimezones
returns
Time Zones:
When I try to set timezone from command line I go info about invalid timezone.
What is interesting:
/etc/localtime -&gt; /var/db/timezone/zoneinfo/Europe/Warsaw
Still time is not correct for Warsaw timezone.
I tried set automatically and not - nothing helps. (I did reboot laptop)
I suspect there is some cache for timezones which is corrupted, but I don't know how to rebuild it.
System Version: macOS 10.15.6 (19G2021)
Kernel Version: Darwin 19.6.0
I think you are encountering the same issue as Time in GMT or Missing Time Zones in systemsetup. I posted a solution there. In my case, I didn't even have the visual representation of the timezone on the map.