$ sudo timedatectl set-timezone Europe/Bratislava
sudo timedatectl set-timezone your_time_zone
timedatectl list-timezones
$ timedatectl list-timezones | grep -i europe Europe/Amsterdam Europe/Andorra Europe/Astrakhan Europe/Athens Europe/Belgrade Europe/Berlin Europe/Bratislava Europe/Brussels Europe/Bucharest Europe/Budapest Europe/Busingen ... Europe/Zurich