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 FreeBSD 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 39program 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. 43.Nm 44also determines whether any adjustment is necessary for systems where 45the hardware clock does not keep 46.Tn UTC . 47.Pp 48The following option is available: 49.Bl -tag -offset indent -width Fl 50.It Fl n 51Do not create or copy files. 52.El 53.Pp 54It is possible to short-circuit the menu system by specifying a 55.Ar default 56on the command line; this is intended mainly for pre-configured 57installation scripts. 58.Sh TIMEZONE DATABASE 59The contents of the timezone database are indexed by 60.Pa /usr/share/zoneinfo/zone.tab . 61This file lists, for each timezone data file, the 62.Tn ISO 633166 territory code, approximate geographical coordinates 64.Pq in Tn ISO No 6709 format , 65and location within the territory. 66.Pp 67The maintainers of the database maintain the following policies: 68.Bl -enum -offset indent 69.It 70At least one zone for every country or inhabited geographical territory. 71.It 72One zone for every distinct, documented timezone history since the 73beginning of the 74.Ux 75epoch (January 1, 1970, 76.Tn GMT ) . 77.It 78Each zone is named for the most populous city therein. (Where possible, 79the database includes pre-1970 history for its city.) 80.El 81The source code to the database 82.Pq Pa /usr/src/share/zoneinfo/[a-z]* 83contains many additional comments and documentation references for the 84historically minded. 85.Sh BUGS 86Programs which are already running when 87.Nm 88creates or updates 89.Pa /etc/localtime 90will not reflect the updated timezone. 91When the system is first configured for a 92.Pf non- Tn UTC 93hardware clock, it is necessary to run 94.Xr adjkerntz 8 95(which normally happens as a part of system startup) in order to update 96the kernel's idea of the correct timezone offset. 97.Sh FILES 98.Bl -tag -width /usr/share/zoneinfo/zone.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 106.Tn ISO 1073166 territory codes to names 108.It Pa /usr/share/zoneinfo 109directory for zoneinfo files 110.It Pa /usr/share/zoneinfo/zone.tab 111mapping of timezone file to country and location 112.El 113.Sh SEE ALSO 114.Xr date 1 , 115.Xr adjtime 2 , 116.Xr ctime 3 , 117.Xr timezone 3 , 118.Xr tzfile 5 , 119.Xr adjkerntz 8 , 120.Xr zdump 8 , 121.Xr zic 8 122.Sh DISCLAIMER 123The representation of certain localities as being associated with certain 124countries and/or territories is for the purposes of identification only, 125and does not imply any endorsement or rejection on the part of the 126.Fx 127Project of the territorial claims of any entity. 128