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 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(in 65.Tn ISO 666709 format), 67and location within the territory. 68.Pp 69The maintainers of the database maintain the following policies: 70.Bl -enum -offset indent 71.It 72At least one zone for every country or inhabited geographical territory. 73.It 74One zone for every distinct, documented timezone history since the 75beginning of the 76.Ux 77epoch (January 1, 1970, 78.Tn GMT ) . 79.It 80Each zone is named for the most populous city therein. (Where possible, 81the database includes pre-1970 history for its city.) 82.El 83The source code to the database 84.Pq Pa /usr/src/share/zoneinfo/[a-z]* 85contains many additional comments and documentation references for the 86historically minded. 87.Sh BUGS 88Programs which are already running when 89.Nm 90creates or updates 91.Pa /etc/localtime 92will not reflect the updated timezone. 93When the system is first configured for a 94.Pf non- Tn UTC 95hardware clock, it is necessary to run 96.Xr adjkerntz 8 97(which normally happens as a part of system startup) in order to update 98the kernel's idea of the correct timezone offset. 99.Sh FILES 100.Bl -tag -width /usr/share/zoneinfo/zone.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 108.Tn ISO 1093166 territory codes to names 110.It Pa /usr/share/zoneinfo 111directory for zoneinfo files 112.It Pa /usr/share/zoneinfo/zone.tab 113mapping of timezone file to country and location 114.El 115.Sh SEE ALSO 116.Xr date 1 , 117.Xr adjtime 2 , 118.Xr ctime 3 , 119.Xr timezone 3 , 120.Xr tzfile 5 , 121.Xr adjkerntz 8 , 122.Xr zdump 8 , 123.Xr zic 8 124.Sh DISCLAIMER 125The representation of certain localities as being associated with certain 126countries and/or territories is for the purposes of identification only, 127and does not imply any endorsement or rejection on the part of the 128.Fx 129Project of the territorial claims of any entity. 130