1.\" Copyright (c) 1996 Wolfram Schneider <wosch@FreeBSD.org>. Berlin. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.Dd April 18, 2023 26.Dt TZSETUP 8 27.Os 28.Sh NAME 29.Nm tzsetup 30.Nd set local timezone 31.Sh SYNOPSIS 32.Nm 33.Op Fl nrs 34.Op Fl C Ar chroot_directory 35.Op Ar zoneinfo_file | zoneinfo_name 36.Sh DESCRIPTION 37The 38.Nm 39utility reads a database of timezone information and presents a menu 40allowing the user to select a specific zone without knowing the details 41of the database layout. 42The selected zone is installed as the system 43default zone. 44The 45.Nm 46utility also determines whether any adjustment is necessary for systems where 47the hardware clock does not keep UTC. 48.Pp 49The following options are available: 50.Bl -tag -offset indent -width Fl 51.It Fl C Ar chroot_directory 52Open all files and directories relative to 53.Ar chroot_directory . 54.It Fl n 55Do not create or symlink files. 56.It Fl r 57Reinstall the zoneinfo file installed last time. 58The name is obtained from 59.Pa /var/db/zoneinfo . 60.It Fl s 61Skip the initial question about adjusting the clock if not set to UTC. 62.El 63.Pp 64It is possible to short-circuit the menu system by specifying the 65location of a 66.Ar zoneinfo_file 67or the name of the 68.Ar zoneinfo_name 69on the command line; this is intended mainly for pre-configured installation 70scripts or people who know which zoneinfo they want to install. 71.Sh TIMEZONE DATABASE 72The contents of the timezone database are indexed by 73.Pa /usr/share/zoneinfo/zone1970.tab . 74This file lists, for each timezone data file, the ISO 3166 territory code, 75approximate geographical coordinates (in ISO 6709 format), 76and location within the territory. 77.Pp 78The maintainers of the database maintain the following policies: 79.Bl -enum -offset indent 80.It 81At least one zone for every country or inhabited geographical territory. 82.It 83One zone for every distinct, documented timezone history since the 84beginning of the 85.Ux 86epoch (January 1, 1970, GMT). 87.It 88Each zone is named for the most populous city therein. 89(Where possible, 90the database includes pre-1970 history for its city.) 91.El 92.Pp 93The source code to the database 94.Pq Pa /usr/src/contrib/tzdata/[a-z]* 95contains many additional comments and documentation references for the 96historically minded. 97.Sh FILES 98.Bl -tag -width ".Pa /usr/share/zoneinfo/zone1970.tab" -compact 99.It Pa /etc/localtime 100current time zone file 101.It Pa /etc/wall_cmos_clock 102see 103.Xr adjkerntz 8 104.It Pa /usr/share/misc/iso3166 105mapping of ISO 3166 territory codes to names 106.It Pa /usr/share/zoneinfo 107directory for zoneinfo files 108.It Pa /usr/share/zoneinfo/zone1970.tab 109mapping of timezone file to country and location 110.It Pa /var/db/zoneinfo 111saved name of the timezone file installed last 112.El 113.Sh EXAMPLES 114Normal usage, to select the right zoneinfo file via the dialog-based 115user interface: 116.Pp 117.Dl # tzsetup 118.Pp 119Install the file 120.Pa /usr/share/zoneinfo/Australia/Sydney : 121.Pp 122.Dl "# tzsetup /usr/share/zoneinfo/Australia/Sydney" 123.Pp 124Install the zoneinfo file for Australia/Sydney, assumed to be located in 125.Pa /usr/share/zoneinfo : 126.Pp 127.Dl "# tzsetup Australia/Sydney" 128.Pp 129After a reinstall of the zoneinfo files, you can reinstall the 130latest installed zoneinfo file (as specified in 131.Pa /var/db/zoneinfo ) : 132.Pp 133.Dl "# tzsetup -r" 134.Sh SEE ALSO 135.Xr date 1 , 136.Xr adjtime 2 , 137.Xr ctime 3 , 138.Xr timezone 3 , 139.Xr tzfile 5 , 140.Xr adjkerntz 8 , 141.Xr zdump 8 , 142.Xr zic 8 143.Sh DISCLAIMER 144The representation of certain localities as being associated with certain 145countries and/or territories is for the purposes of identification only, 146and does not imply any endorsement or rejection on the part of the 147.Fx 148Project of the territorial claims of any entity. 149.Sh BUGS 150Programs which are already running when 151.Nm 152creates or updates 153.Pa /etc/localtime 154will not reflect the updated timezone. 155When the system is first configured for a non-UTC 156hardware clock, it is necessary to run 157.Xr adjkerntz 8 158(which normally happens as a part of system startup) in order to update 159the kernel's idea of the correct timezone offset. 160