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.\" $FreeBSD$ 26.\" 27.Dd April 18, 2023 28.Dt TZSETUP 8 29.Os 30.Sh NAME 31.Nm tzsetup 32.Nd set local timezone 33.Sh SYNOPSIS 34.Nm 35.Op Fl nrs 36.Op Fl C Ar chroot_directory 37.Op Ar zoneinfo_file | zoneinfo_name 38.Sh DESCRIPTION 39The 40.Nm 41utility reads a database of timezone information and presents a menu 42allowing the user to select a specific zone without knowing the details 43of the database layout. 44The selected zone is installed as the system 45default zone. 46The 47.Nm 48utility also determines whether any adjustment is necessary for systems where 49the hardware clock does not keep UTC. 50.Pp 51The following options are available: 52.Bl -tag -offset indent -width Fl 53.It Fl C Ar chroot_directory 54Open all files and directories relative to 55.Ar chroot_directory . 56.It Fl n 57Do not create or copy files. 58.It Fl r 59Reinstall the zoneinfo file installed last time. 60The name is obtained from 61.Pa /var/db/zoneinfo . 62.It Fl s 63Skip the initial question about adjusting the clock if not set to UTC. 64.El 65.Pp 66It is possible to short-circuit the menu system by specifying the 67location of a 68.Ar zoneinfo_file 69or the name of the 70.Ar zoneinfo_name 71on the command line; this is intended mainly for pre-configured installation 72scripts or people who know which zoneinfo they want to install. 73.Sh TIMEZONE DATABASE 74The contents of the timezone database are indexed by 75.Pa /usr/share/zoneinfo/zone1970.tab . 76This file lists, for each timezone data file, the ISO 3166 territory code, 77approximate geographical coordinates (in ISO 6709 format), 78and location within the territory. 79.Pp 80The maintainers of the database maintain the following policies: 81.Bl -enum -offset indent 82.It 83At least one zone for every country or inhabited geographical territory. 84.It 85One zone for every distinct, documented timezone history since the 86beginning of the 87.Ux 88epoch (January 1, 1970, GMT). 89.It 90Each zone is named for the most populous city therein. 91(Where possible, 92the database includes pre-1970 history for its city.) 93.El 94.Pp 95The source code to the database 96.Pq Pa /usr/src/contrib/tzdata/[a-z]* 97contains many additional comments and documentation references for the 98historically minded. 99.Sh FILES 100.Bl -tag -width ".Pa /usr/share/zoneinfo/zone1970.tab" -compact 101.It Pa /etc/localtime 102current time zone file 103.It Pa /etc/wall_cmos_clock 104see 105.Xr adjkerntz 8 106.It Pa /usr/share/misc/iso3166 107mapping of ISO 3166 territory codes to names 108.It Pa /usr/share/zoneinfo 109directory for zoneinfo files 110.It Pa /usr/share/zoneinfo/zone1970.tab 111mapping of timezone file to country and location 112.It Pa /var/db/zoneinfo 113saved name of the timezone file installed last 114.El 115.Sh EXAMPLES 116Normal usage, to select the right zoneinfo file via the dialog-based 117user interface: 118.Pp 119.Dl # tzsetup 120.Pp 121Install the file 122.Pa /usr/share/zoneinfo/Australia/Sydney : 123.Pp 124.Dl "# tzsetup /usr/share/zoneinfo/Australia/Sydney" 125.Pp 126Install the zoneinfo file for Australia/Sydney, assumed to be located in 127.Pa /usr/share/zoneinfo : 128.Pp 129.Dl "# tzsetup Australia/Sydney" 130.Pp 131After a reinstall of the zoneinfo files, you can reinstall the 132latest installed zoneinfo file (as specified in 133.Pa /var/db/zoneinfo ) : 134.Pp 135.Dl "# tzsetup -r" 136.Sh SEE ALSO 137.Xr date 1 , 138.Xr adjtime 2 , 139.Xr ctime 3 , 140.Xr timezone 3 , 141.Xr tzfile 5 , 142.Xr adjkerntz 8 , 143.Xr zdump 8 , 144.Xr zic 8 145.Sh DISCLAIMER 146The representation of certain localities as being associated with certain 147countries and/or territories is for the purposes of identification only, 148and does not imply any endorsement or rejection on the part of the 149.Fx 150Project of the territorial claims of any entity. 151.Sh BUGS 152Programs which are already running when 153.Nm 154creates or updates 155.Pa /etc/localtime 156will not reflect the updated timezone. 157When the system is first configured for a non-UTC 158hardware clock, it is necessary to run 159.Xr adjkerntz 8 160(which normally happens as a part of system startup) in order to update 161the kernel's idea of the correct timezone offset. 162