133 lines
4.1 KiB
Groff
133 lines
4.1 KiB
Groff
.\" Copyright (c) 1996 Wolfram Schneider <wosch@FreeBSD.org>. Berlin.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.Dd January 24, 1996
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.Dt TZSETUP 8
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.Os
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.Sh NAME
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.Nm tzsetup
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.Nd set local timezone
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.Sh SYNOPSIS
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.Nm
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.Op Fl n
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.Op Ar default
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.Sh DESCRIPTION
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The
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.Nm
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utility reads a database of timezone information and presents a menu
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allowing the user to select a specific zone without knowing the details
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of the database layout.
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The selected zone is installed as the system
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default zone.
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The
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.Nm
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utility also determines whether any adjustment is necessary for systems where
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the hardware clock does not keep
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.Tn UTC .
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.Pp
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The following option is available:
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.Bl -tag -offset indent -width Fl
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.It Fl n
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Do not create or copy files.
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.El
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.Pp
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It is possible to short-circuit the menu system by specifying a
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.Ar default
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on the command line; this is intended mainly for pre-configured
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installation scripts.
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.Sh TIMEZONE DATABASE
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The contents of the timezone database are indexed by
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.Pa /usr/share/zoneinfo/zone.tab .
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This file lists, for each timezone data file, the
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.Tn ISO
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3166 territory code, approximate geographical coordinates
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(in
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.Tn ISO
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6709 format),
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and location within the territory.
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.Pp
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The maintainers of the database maintain the following policies:
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.Bl -enum -offset indent
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.It
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At least one zone for every country or inhabited geographical territory.
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.It
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One zone for every distinct, documented timezone history since the
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beginning of the
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.Ux
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epoch (January 1, 1970,
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.Tn GMT ) .
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.It
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Each zone is named for the most populous city therein.
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(Where possible,
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the database includes pre-1970 history for its city.)
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.El
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The source code to the database
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.Pq Pa /usr/src/share/zoneinfo/[a-z]*
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contains many additional comments and documentation references for the
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historically minded.
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.Sh BUGS
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Programs which are already running when
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.Nm
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creates or updates
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.Pa /etc/localtime
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will not reflect the updated timezone.
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When the system is first configured for a
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.Pf non- Tn UTC
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hardware clock, it is necessary to run
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.Xr adjkerntz 8
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(which normally happens as a part of system startup) in order to update
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the kernel's idea of the correct timezone offset.
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.Sh FILES
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.Bl -tag -width /usr/share/zoneinfo/zone.tab -compact
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.It Pa /etc/localtime
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current time zone file
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.It Pa /etc/wall_cmos_clock
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see
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.Xr adjkerntz 8 .
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.It Pa /usr/share/misc/iso3166
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mapping of
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.Tn ISO
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3166 territory codes to names
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.It Pa /usr/share/zoneinfo
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directory for zoneinfo files
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.It Pa /usr/share/zoneinfo/zone.tab
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mapping of timezone file to country and location
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.El
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.Sh SEE ALSO
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.Xr date 1 ,
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.Xr adjtime 2 ,
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.Xr ctime 3 ,
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.Xr timezone 3 ,
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.Xr tzfile 5 ,
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.Xr adjkerntz 8 ,
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.Xr zdump 8 ,
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.Xr zic 8
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.Sh DISCLAIMER
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The representation of certain localities as being associated with certain
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countries and/or territories is for the purposes of identification only,
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and does not imply any endorsement or rejection on the part of the
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.Fx
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Project of the territorial claims of any entity.
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