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-.\" Copyright (c) 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Arthur David Olson of the National Cancer Institute.
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 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.
-.\"
-.\"	@(#)tzfile.5	8.1 (Berkeley) 6/8/93
-.\"
-.Dd June 8, 1993
-.Dt TZFILE 5
-.Os
-.Sh NAME
-.Nm tzfile
-.Nd time zone information
-.Sh SYNOPSIS
-.Fd #include <tzfile.h>
-.Sh DESCRIPTION
-The time zone information files used by
-.Xr tzset 3
-begin with bytes reserved for future use,
-followed by four four-byte values of type
-.Em long ,
-written in a ``standard'' byte order
-(the high-order byte of the value is written first).
-These values are,
-in order:
-.Bl -tag -width tzh_ttisstdcnt
-.It Fa tzh_ttisstdcnt
-The number of standard/wall indicators stored in the file.
-.It Fa tzh_leapcnt
-The number of leap seconds for which data is stored in the file.
-.It Fa tzh_timecnt
-The number of "transition times" for which data is stored
-in the file.
-.It Fa tzh_typecnt
-The number of "local time types" for which data is stored
-in the file (must not be zero).
-.It Fa tzh_charcnt
-The number of characters of "time zone abbreviation strings"
-stored in the file.
-.El
-.Pp
-The above header is followed by
-.Fa tzh_timecnt
-four-byte values of type
-.Em long ,
-sorted in ascending order.
-These values are written in ``standard'' byte order.
-Each is used as a transition time (as returned by
-.Xr time 2 )
-at which the rules for computing local time change.
-Next come
-.Fa tzh_timecnt
-one-byte values of type
-.Fa unsigned char ;
-each one tells which of the different types of ``local time'' types
-described in the file is associated with the same-indexed transition time.
-These values serve as indices into an array of
-.Fa ttinfo
-structures that appears next in the file; 
-these structures are defined as follows:
-.Bd -literal -offset indent
-struct ttinfo {	
-	long	tt_gmtoff;
-	int	tt_isdst;
-	unsigned int	tt_abbrind;
-};
-.Ed
-.Pp
-Each structure is written as a four-byte value for
-.Fa tt_gmtoff
-of type
-.Em long ,
-in a standard byte order, followed by a one-byte value for
-.Fa tt_isdst
-and a one-byte value for
-.Fa tt_abbrind .
-In each structure,
-.Fa tt_gmtoff
-gives the number of seconds to be added to
-.Tn GMT ,
-.Fa tt_isdst
-tells whether
-.Fa tm_isdst
-should be set by
-.Xr localtime 3
-and
-.Fa tt_abbrind
-serves as an index into the array of time zone abbreviation characters
-that follow the
-.Fa ttinfo
-structure(s) in the file.
-.Pp
-Then there are
-.Fa tzh_leapcnt
-pairs of four-byte values, written in standard byte order;
-the first value of each pair gives the time
-(as returned by 
-.Xr time 2 )
-at which a leap second occurs;
-the second gives the
-.Em total
-number of leap seconds to be applied after the given time.
-The pairs of values are sorted in ascending order by time.
-.Pp
-Finally there are
-.Fa tzh_ttisstdcnt
-standard/wall indicators, each stored as a one-byte value;
-they tell whether the transition times associated with local time types
-were specified as standard time or wall clock time,
-and are used when a time zone file is used in handling
-.Tn POSIX Ns -style
-time zone environment variables.
-.Pp
-.Fa Localtime
-uses the first standard-time
-.Fa ttinfo
-structure in the file
-(or simply the first
-.Fa ttinfo
-structure in the absence of a standard-time structure)
-if either
-.Fa tzh_timecnt
-is zero or the time argument is less than the first transition time recorded
-in the file.
-.Sh SEE ALSO
-.Xr ctime 3
-.Sh HISTORY
-The
-.Nm tzfile
-file format appeared in
-.Bx 4.3 tahoe.