localtime - Local timezone configuration file
/etc/localtime -> ../usr/share/zoneinfo/...
The /etc/localtime file configures the system-wide timezone of the local system
that is used by applications for presentation to the user. It should be an
absolute or relative symbolic link pointing to /usr/share/zoneinfo/, followed
by a timezone identifier such as "Europe/Berlin" or
"Etc/UTC". The resulting link should lead to the corresponding
binary tzfile(5) timezone data for the configured timezone.
Because the timezone identifier is extracted from the symlink
target name of /etc/localtime, this file may not be a normal file or
The timezone may be overridden for individual programs by using
the $TZ environment variable. See environ(7).
You may use timedatectl(1) to change the settings of this
file from the command line during runtime. Use systemd-firstboot(1)
to initialize the time zone on mounted (but not booted) system images.