TZSETUP(8)              FreeBSD System Manager's Manual             TZSETUP(8)

NAME
     tzsetup - set local timezone

SYNOPSIS
     tzsetup [-nrs] [-C chroot_directory] [zoneinfo_file | zoneinfo_name]

DESCRIPTION
     The tzsetup utility reads a database of timezone information and presents
     a menu allowing the user to select a specific zone without knowing the
     details of the database layout.  The selected zone is installed as the
     system default zone.  The tzsetup utility also determines whether any
     adjustment is necessary for systems where the hardware clock does not
     keep UTC.

     The following options are available:

           -C chroot_directory
                       Open all files and directories relative to
                       chroot_directory.

           -n          Do not create or copy files.

           -r          Reinstall the zoneinfo file installed last time.  The
                       name is obtained from /var/db/zoneinfo.

           -s          Skip the initial question about adjusting the clock if
                       not set to UTC.

     It is possible to short-circuit the menu system by specifying the
     location of a zoneinfo_file or the name of the zoneinfo_name on the
     command line; this is intended mainly for pre-configured installation
     scripts or people who know which zoneinfo they want to install.

TIMEZONE DATABASE
     The contents of the timezone database are indexed by
     /usr/share/zoneinfo/zone.tab.  This file lists, for each timezone data
     file, the ISO 3166 territory code, approximate geographical coordinates
     (in ISO 6709 format), and location within the territory.

     The maintainers of the database maintain the following policies:

           1.   At least one zone for every country or inhabited geographical
                territory.

           2.   One zone for every distinct, documented timezone history since
                the beginning of the UNIX epoch (January 1, 1970, GMT).

           3.   Each zone is named for the most populous city therein.  (Where
                possible, the database includes pre-1970 history for its
                city.)
     The source code to the database (/usr/src/share/zoneinfo/[a-z]*) contains
     many additional comments and documentation references for the
     historically minded.

FILES
     /etc/localtime                    current time zone file
     /etc/wall_cmos_clock              see adjkerntz(8)
     /usr/share/misc/iso3166           mapping of ISO 3166 territory codes to
                                       names
     /usr/share/zoneinfo               directory for zoneinfo files
     /usr/share/zoneinfo/zone.tab      mapping of timezone file to country and
                                       location
     /var/db/zoneinfo                  saved name of the timezone file
                                       installed last

EXAMPLES
     Normal usage, to select the right zoneinfo file via the dialog-based user
     interface:
           tzsetup

     Install the file /usr/share/zoneinfo/Australia/Sydney:
           tzsetup /usr/share/zoneinfo/Australia/Sydney

     Install the zoneinfo file for Australia/Sydney, assumed to be located in
     /usr/share/zoneinfo:
           tzsetup Australia/Sydney

     After a reinstall of the zoneinfo files, you can reinstall the latest
     installed zoneinfo file (as specified in /var/db/zoneinfo):
           tzsetup -r

SEE ALSO
     date(1), adjtime(2), ctime(3), timezone(3), tzfile(5), adjkerntz(8),
     zdump(8), zic(8)

DISCLAIMER
     The representation of certain localities as being associated with certain
     countries and/or territories is for the purposes of identification only,
     and does not imply any endorsement or rejection on the part of the
     FreeBSD Project of the territorial claims of any entity.

BUGS
     Programs which are already running when tzsetup creates or updates
     /etc/localtime will not reflect the updated timezone.  When the system is
     first configured for a non-UTC hardware clock, it is necessary to run
     adjkerntz(8) (which normally happens as a part of system startup) in
     order to update the kernel's idea of the correct timezone offset.

FreeBSD 13.1-RELEASE-p6        October 21, 2009        FreeBSD 13.1-RELEASE-p6