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-.\" Copyright (c) 1989, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Arthur Olson.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	@(#)tzset.3	8.2 (Berkeley) 11/17/93
-.\" $FreeBSD: src/lib/libc/gen/tzset.3,v 1.12 2001/10/01 16:08:51 ru Exp $
-.\"
-.Dd November 17, 1993
-.Dt TZSET 3
-.Os
-.Sh NAME
-.Nm tzset ,
-.Nm tzsetwall
-.Nd initialize time conversion information
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In time.h
-.Ft void
-.Fo tzset
-.Fa void
-.Fc
-.Ft void
-.Fo tzsetwall
-.Fa void
-.Fc
-.Sh DESCRIPTION
-The
-.Fn tzset
-function
-initializes time conversion information used by the library routine
-.Xr localtime 3 .
-The environment variable
-.Ev TZ
-specifies how this is done.
-.Pp
-If
-.Ev TZ
-does not appear in the environment, the best available approximation to
-local wall clock time, as specified by the
-.Xr tzfile 5 Ns -format
-file
-#ifdef UNIFDEF_MOVE_LOCALTIME
-.Pa /var/db/timezone/localtime ,
-#else /* !UNIFDEF_MOVE_LOCALTIME */
-.Pa /etc/localtime ,
-#endif /* UNIFDEF_MOVE_LOCALTIME */
-is used.
-.Pp
-If
-.Ev TZ
-appears in the environment but its value is a null string,
-Coordinated Universal Time
-.Pq Tn UTC
-is used (without leap second correction).
-.Pp
-If
-.Ev TZ
-appears in the environment and its value begins with a colon
-.Pq Ql \&: ,
-the rest of its value is used as a pathname of a
-.Xr tzfile 5 Ns -format
-file from which to read the time conversion information.
-If the first character of the pathname is a slash
-.Pq Ql / ,
-it is used as
-an absolute pathname; otherwise, it is used as a pathname relative to
-the system time conversion information directory.
-.Pp
-If its value does not begin with a colon, it is first used as the pathname
-of a file (as described above) from which to read the time conversion
-information.
-If that file cannot be read, the value is then interpreted as a direct
-specification (the format is described below) of the time conversion
-information.
-.Pp
-If the
-.Ev TZ
-environment variable does not specify a
-.Xr tzfile 5 Ns -format
-file and cannot be interpreted as a direct specification,
-.Tn UTC
-is used.
-.Pp
-The
-.Fn tzsetwall
-function
-sets things up so that
-.Xr localtime
-returns the best available approximation of local wall clock time.
-.Sh SPECIFICATION FORMAT
-When
-.Ev TZ
-is used directly as a specification of the time conversion information,
-it must have the following syntax (spaces inserted for clarity):
-.Bd -ragged -offset indent
-.Em std offset
-.Bo
-.Em dst
-.Bq Em offset
-.Bq , Em rule
-.Bc
-.Ed
-.Pp
-Where:
-.Bl -tag -width std_and_dst -offset indent
-.It Em std No and Em dst
-Three or more bytes that are the designation for the standard
-.Pq Em std
-or summer
-.Pq Em dst
-time zone.  Only
-.Em std
-is required; if
-.Em dst
-is missing, then summer time does not apply in this locale.
-Upper and lowercase letters are explicitly allowed.  Any characters
-except a leading colon
-.Pq Ql \&: ,
-digits, comma
-.Pq Ql \&, ,
-minus
-.Pq Ql \- ,
-plus
-.Pq Ql + ,
-and
-.Tn ASCII
-.Dv NUL
-are allowed.
-.It Em offset
-Indicates the value one must add to the local time to arrive at
-Coordinated Universal Time.  The
-.Em offset
-has the form:
-.Bd -ragged -offset indent
-.Sm off
-.Em hh Bo
-.Em : mm
-.Bq Em : ss
-.Bc
-.Sm on
-.Ed
-.Pp
-The minutes
-.Pq Em mm
-and seconds
-.Pq Em ss
-are optional.  The hour
-.Pq Em hh
-is required and may be a single digit.  The
-.Em offset
-following
-.Em std
-is required.  If no
-.Em offset
-follows
-.Em dst ,
-summer time is assumed to be one hour ahead of standard time.  One or
-more digits may be used; the value is always interpreted as a decimal
-number.  The hour must be between zero and 24, and the minutes (and
-seconds) \(em if present \(em between zero and 59.  If preceded by a
-.Pq Ql \-
-the time zone shall be east of the Prime Meridian; otherwise it shall be
-west (which may be indicated by an optional preceding
-.Pq Ql + ) .
-.It Em rule
-Indicates when to change to and back from summer time.  The
-.Em rule
-has the form:
-.Bd -ragged -offset indent
-.Em date/time,date/time
-.Ed
-.Pp
-where the first
-.Em date
-describes when the change from standard to summer time occurs and the
-second
-.Em date
-describes when the change back happens.  Each
-.Em time
-field describes when, in current local time, the change to the other
-time is made.
-.Pp
-The format of
-.Em date
-is one of the following:
-.Bl -tag -width "M.m.n.d"
-.It Sy J Em n
-The Julian day
-.Em n
-(1 \*(Le
-.Em n
-\*(Le 365).
-Leap days are not counted; that is, in all years \(em including leap
-years \(em February 28 is day 59 and March 1 is day 60.  It is
-impossible to explicitly refer to the occasional February 29.
-.It Em n
-The zero-based Julian day
-(0 \*(Le
-.Em n
-\*(Le 365 ) .
-Leap days are counted, and it is possible to refer to February 29.
-.It Sy M  Em m.n.d
-The
-.Em d Ns 'th
-day (0 \*(Le
-.Em d
-\*(Le 6)
-of week
-.Em n
-of month
-.Em m
-of the year
-(1 \*(Le
-.Em n
-\*(Le 5),
-(1 \*(Le
-.Em m
-\*(Le 12),
-where week 5 means
-.Do
-the last
-.Em d
-day in month
-.Em m
-.Dc
-which may occur in either the fourth or the fifth week).  Week 1 is the
-first week in which the
-.Em d Ns 'th
-day occurs.  Day zero is Sunday.
-.Pp
-The
-.Em time
-has the same format as
-.Em offset
-except that no leading sign
-.Pq Ql \-
-or
-.Pq Ql +
-is allowed.  The default, if
-.Em time
-is not given, is
-.Sy 02:00:00 .
-.El
-.Pp
-If no
-.Em rule
-is present in the
-.Ev TZ
-specification, the rules specified
-by the
-.Xr tzfile 5 Ns -format
-file
-.Em posixrules
-in the system time conversion information directory are used, with the
-standard and summer time offsets from
-.Tn UTC
-replaced by those specified by
-the
-.Em offset
-values in
-.Ev TZ .
-.El
-.Pp
-For compatibility with System V Release 3.1, a semicolon
-.Pq Ql \&;
-may be used to separate the
-.Em rule
-from the rest of the specification.
-.Sh FILES
-#ifdef UNIFDEF_TZDIR_SYMLINK
-.ds zi /var/db/timezone/zoneinfo
-#else /* !UNIFDEF_TZDIR_SYMLINK */
-.ds zi /usr/share/zoneinfo
-#endif /* UNIFDEF_TZDIR_SYMLINK */
-.Bl -tag -width \*(zi/posixrules -compact
-.It Pa /etc/localtime
-local time zone file
-.It Pa \*(zi
-time zone directory
-.It Pa \*(zi/posixrules
-rules for
-.Tn POSIX Ns -style
-.Tn TZ Ns 's
-.It Pa \*(zi/GMT
-for
-.Tn UTC
-leap seconds
-.El
-.Pp
-If the file
-.Pa \*(zi/GMT
-does not exist,
-.Tn UTC
-leap seconds are loaded from
-.Pa \*(zi/posixrules .
-.Sh SEE ALSO
-.Xr date 1 ,
-.Xr gettimeofday 2 ,
-.Xr ctime 3 ,
-.Xr getenv 3 ,
-.Xr time 3 ,
-.Xr tzfile 5
-.Sh HISTORY
-The
-.Fn tzset
-and
-.Fn tzsetwall
-functions first appeared in
-.Bx 4.4 .