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.Dd January 24, 1996 27.Dt TZSETUP 8 28.Os 29.Sh NAME 30.Nm tzsetup 31.Nd set local timezone 32.Sh SYNOPSIS 33.Nm 34.Op Fl n 35.Op Ar default 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. The selected zone is installed as the system 42default zone. 43The 44.Nm 45utility also determines whether any adjustment is necessary for systems where 46the hardware clock does not keep 47.Tn UTC . 48.Pp 49The following option is available: 50.Bl -tag -offset indent -width Fl 51.It Fl n 52Do not create or copy files. 53.El 54.Pp 55It is possible to short-circuit the menu system by specifying a 56.Ar default 57on the command line; this is intended mainly for pre-configured 58installation scripts. 59.Sh TIMEZONE DATABASE 60The contents of the timezone database are indexed by 61.Pa /usr/share/zoneinfo/zone.tab . 62This file lists, for each timezone data file, the 63.Tn ISO 643166 territory code, approximate geographical coordinates 65(in 66.Tn ISO 676709 format), 68and location within the territory. 69.Pp 70The maintainers of the database maintain the following policies: 71.Bl -enum -offset indent 72.It 73At least one zone for every country or inhabited geographical territory. 74.It 75One zone for every distinct, documented timezone history since the 76beginning of the 77.Ux 78epoch (January 1, 1970, 79.Tn GMT ) . 80.It 81Each zone is named for the most populous city therein. (Where possible, 82the database includes pre-1970 history for its city.) 83.El 84The source code to the database 85.Pq Pa /usr/src/share/zoneinfo/[a-z]* 86contains many additional comments and documentation references for the 87historically minded. 88.Sh BUGS 89Programs which are already running when 90.Nm 91creates or updates 92.Pa /etc/localtime 93will not reflect the updated timezone. 94When the system is first configured for a 95.Pf non- Tn UTC 96hardware clock, it is necessary to run 97.Xr adjkerntz 8 98(which normally happens as a part of system startup) in order to update 99the kernel's idea of the correct timezone offset. 100.Sh FILES 101.Bl -tag -width /usr/share/zoneinfo/zone.tab -compact 102.It Pa /etc/localtime 103current time zone file 104.It Pa /etc/wall_cmos_clock 105see 106.Xr adjkerntz 8 . 107.It Pa /usr/share/misc/iso3166 108mapping of 109.Tn ISO 1103166 territory codes to names 111.It Pa /usr/share/zoneinfo 112directory for zoneinfo files 113.It Pa /usr/share/zoneinfo/zone.tab 114mapping of timezone file to country and location 115.El 116.Sh SEE ALSO 117.Xr date 1 , 118.Xr adjtime 2 , 119.Xr ctime 3 , 120.Xr timezone 3 , 121.Xr tzfile 5 , 122.Xr adjkerntz 8 , 123.Xr zdump 8 , 124.Xr zic 8 125.Sh DISCLAIMER 126The representation of certain localities as being associated with certain 127countries and/or territories is for the purposes of identification only, 128and does not imply any endorsement or rejection on the part of the 129.Fx 130Project of the territorial claims of any entity. 131