systemd

Set time to synchronize with an ntp server:

timedatectl set-ntp true

This info stays in /usr/share/zoneinfo.

Local Time

Local time is kept in /etc/localtime.

According to Dave's LPIC guide, you can set the local time by making asymboling link from your timezone to /etc/localtime, as so:

sudo ln -sf /usr/share/zoneinfo/Europe/Belgrade /etc/localtime

...however this produced the wrong time for me. Further, /etc/localtime produces an output with cat, while the zoneinfo files do not.

See local time, language and character settings with:

locale

List available locales with:

locale -a

To see additional locales which are available (but not necessarily installed):

cat /usr/share/i18n/SUPPORTED

Set a supported locale with:

locale-gen pl_PL.UTF-8

Then set that language, with:

LANG=pl_PL.UTF-8

... then reboot.

Glimpse an overview with:

ntpq -p

Usually this is run as a service, so just start that service.