1 .\" Copyright (c) 1996 Wolfram Schneider <wosch@FreeBSD.org>. Berlin.
2 .\" All rights reserved.
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31 .Nd set local timezone
39 program reads a database of timezone information and presents a menu
40 allowing the user to select a specific zone without knowing the details
41 of the database layout. The selected zone is installed as the system
44 also determines whether any adjustment is necessary for systems where
45 the hardware clock does not keep
48 The following option is available:
49 .Bl -tag -offset indent -width Fl
51 Do not create or copy files.
54 It is possible to short-circuit the menu system by specifying a
56 on the command line; this is intended mainly for pre-configured
59 The contents of the timezone database are indexed by
60 .Pa /usr/share/zoneinfo/zone.tab .
61 This file lists, for each timezone data file, the
63 3166 territory code, approximate geographical coordinates
67 and location within the territory.
69 The maintainers of the database maintain the following policies:
70 .Bl -enum -offset indent
72 At least one zone for every country or inhabited geographical territory.
74 One zone for every distinct, documented timezone history since the
77 epoch (January 1, 1970,
80 Each zone is named for the most populous city therein. (Where possible,
81 the database includes pre-1970 history for its city.)
83 The source code to the database
84 .Pq Pa /usr/src/share/zoneinfo/[a-z]*
85 contains many additional comments and documentation references for the
88 Programs which are already running when
92 will not reflect the updated timezone.
93 When the system is first configured for a
95 hardware clock, it is necessary to run
97 (which normally happens as a part of system startup) in order to update
98 the kernel's idea of the correct timezone offset.
100 .Bl -tag -width /usr/share/zoneinfo/zone.tab -compact
101 .It Pa /etc/localtime
102 current time zone file
103 .It Pa /etc/wall_cmos_clock
106 .It Pa /usr/share/misc/iso3166
109 3166 territory codes to names
110 .It Pa /usr/share/zoneinfo
111 directory for zoneinfo files
112 .It Pa /usr/share/zoneinfo/zone.tab
113 mapping of timezone file to country and location
125 The representation of certain localities as being associated with certain
126 countries and/or territories is for the purposes of identification only,
127 and does not imply any endorsement or rejection on the part of the
129 Project of the territorial claims of any entity.