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. 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.El 55.Pp 56It is possible to short-circuit the menu system by specifying a 57.Ar default 58on the command line; this is intended mainly for pre-configured 59installation scripts. 60.Sh TIMEZONE DATABASE 61The contents of the timezone database are indexed by 62.Pa /usr/share/zoneinfo/zone.tab . 63This file lists, for each timezone data file, the 64.Tn ISO 653166 territory code, approximate geographical coordinates 66(in 67.Tn ISO 686709 format), 69and location within the territory. 70.Pp 71The maintainers of the database maintain the following policies: 72.Bl -enum -offset indent 73.It 74At least one zone for every country or inhabited geographical territory. 75.It 76One zone for every distinct, documented timezone history since the 77beginning of the 78.Ux 79epoch (January 1, 1970, 80.Tn GMT ) . 81.It 82Each zone is named for the most populous city therein. 83(Where possible, 84the database includes pre-1970 history for its city.) 85.El 86The source code to the database 87.Pq Pa /usr/src/share/zoneinfo/[a-z]* 88contains many additional comments and documentation references for the 89historically minded. 90.Sh BUGS 91Programs which are already running when 92.Nm 93creates or updates 94.Pa /etc/localtime 95will not reflect the updated timezone. 96When the system is first configured for a 97.Pf non- Tn UTC 98hardware clock, it is necessary to run 99.Xr adjkerntz 8 100(which normally happens as a part of system startup) in order to update 101the kernel's idea of the correct timezone offset. 102.Sh FILES 103.Bl -tag -width /usr/share/zoneinfo/zone.tab -compact 104.It Pa /etc/localtime 105current time zone file 106.It Pa /etc/wall_cmos_clock 107see 108.Xr adjkerntz 8 . 109.It Pa /usr/share/misc/iso3166 110mapping of 111.Tn ISO 1123166 territory codes to names 113.It Pa /usr/share/zoneinfo 114directory for zoneinfo files 115.It Pa /usr/share/zoneinfo/zone.tab 116mapping of timezone file to country and location 117.El 118.Sh SEE ALSO 119.Xr date 1 , 120.Xr adjtime 2 , 121.Xr ctime 3 , 122.Xr timezone 3 , 123.Xr tzfile 5 , 124.Xr adjkerntz 8 , 125.Xr zdump 8 , 126.Xr zic 8 127.Sh DISCLAIMER 128The representation of certain localities as being associated with certain 129countries and/or territories is for the purposes of identification only, 130and does not imply any endorsement or rejection on the part of the 131.Fx 132Project of the territorial claims of any entity. 133