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 July 4, 2009 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 ns 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. 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 48.Tn UTC . 49.Pp 50The following option is available: 51.Bl -tag -offset indent -width Fl 52.It Fl n 53Do not create or copy files. 54.It Fl s 55Skip the initial question about adjusting the clock if not set to 56.Tn UTC . 57.El 58.Pp 59It is possible to short-circuit the menu system by specifying a 60.Ar default 61on the command line; this is intended mainly for pre-configured 62installation scripts. 63.Sh TIMEZONE DATABASE 64The contents of the timezone database are indexed by 65.Pa /usr/share/zoneinfo/zone.tab . 66This file lists, for each timezone data file, the 67.Tn ISO 683166 territory code, approximate geographical coordinates 69(in 70.Tn ISO 716709 format), 72and location within the territory. 73.Pp 74The maintainers of the database maintain the following policies: 75.Bl -enum -offset indent 76.It 77At least one zone for every country or inhabited geographical territory. 78.It 79One zone for every distinct, documented timezone history since the 80beginning of the 81.Ux 82epoch (January 1, 1970, 83.Tn GMT ) . 84.It 85Each zone is named for the most populous city therein. 86(Where possible, 87the database includes pre-1970 history for its city.) 88.El 89The source code to the database 90.Pq Pa /usr/src/share/zoneinfo/[a-z]* 91contains many additional comments and documentation references for the 92historically minded. 93.Sh FILES 94.Bl -tag -width /usr/share/zoneinfo/zone.tab -compact 95.It Pa /etc/localtime 96current time zone file 97.It Pa /etc/wall_cmos_clock 98see 99.Xr adjkerntz 8 . 100.It Pa /usr/share/misc/iso3166 101mapping of 102.Tn ISO 1033166 territory codes to names 104.It Pa /usr/share/zoneinfo 105directory for zoneinfo files 106.It Pa /usr/share/zoneinfo/zone.tab 107mapping of timezone file to country and location 108.El 109.Sh SEE ALSO 110.Xr date 1 , 111.Xr adjtime 2 , 112.Xr ctime 3 , 113.Xr timezone 3 , 114.Xr tzfile 5 , 115.Xr adjkerntz 8 , 116.Xr zdump 8 , 117.Xr zic 8 118.Sh DISCLAIMER 119The representation of certain localities as being associated with certain 120countries and/or territories is for the purposes of identification only, 121and does not imply any endorsement or rejection on the part of the 122.Fx 123Project of the territorial claims of any entity. 124.Sh BUGS 125Programs which are already running when 126.Nm 127creates or updates 128.Pa /etc/localtime 129will not reflect the updated timezone. 130When the system is first configured for a 131.Pf non- Tn UTC 132hardware clock, it is necessary to run 133.Xr adjkerntz 8 134(which normally happens as a part of system startup) in order to update 135the kernel's idea of the correct timezone offset. 136