tzfile man page on CentOS

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TZFILE(5)							     TZFILE(5)

NAME
       tzfile - time zone information

SYNOPSIS
       #include <tzfile.h>

DESCRIPTION
       The  time  zone information files used by tzset(3) begin with the magic
       characters "TZif" to identify then as time zone information files, fol‐
       lowed  by  sixteen bytes reserved for future use, followed by six four-
       byte values of type long, written in a  ``standard''  byte  order  (the
       high-order  byte	 of the value is written first).  These values are, in
       order:

       tzh_ttisgmtcnt
	      The number of UTC/local indicators stored in the file.

       tzh_ttisstdcnt
	      The number of standard/wall indicators stored in the file.

       tzh_leapcnt
	      The number of leap seconds for which data is stored in the file.

       tzh_timecnt
	      The number of "transition times" for which data is stored in the
	      file.

       tzh_typecnt
	      The number of "local time types" for which data is stored in the
	      file (must not be zero).

       tzh_charcnt
	      The number of characters of  "time  zone	abbreviation  strings"
	      stored in the file.

       The  above  header  is followed by tzh_timecnt four-byte values of type
       long, sorted in ascending order.	 These values are written  in  ``stan‐
       dard''  byte  order.  Each is used as a transition time (as returned by
       time(2)) at which the rules for computing local time change.  Next come
       tzh_timecnt one-byte values of type 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 ttinfo structures that appears next in  the
       file; these structures are defined as follows:

	    struct ttinfo {
		 long	       tt_gmtoff;
		 int	       tt_isdst;
		 unsigned int  tt_abbrind;
	    };

       Each  structure	is  written as a four-byte value for tt_gmtoff of type
       long, in a standard byte	 order,	 followed  by  a  one-byte  value  for
       tt_isdst	 and  a	 one-byte  value  for  tt_abbrind.  In each structure,
       tt_gmtoff gives the number of seconds to	 be  added  to	UTC,  tt_isdst
       tells  whether  tm_isdst	 should be set by localtime(3), and tt_abbrind
       serves as an index into the array of time zone abbreviation  characters
       that follow the ttinfo structure(s) in the file.

       Then  there are tzh_leapcnt pairs of four-byte values, written in stan‐
       dard byte order; the first value	 of  each  pair	 gives	the  time  (as
       returned	 by  time(2))  at which a leap second occurs; the second gives
       the total number of leap seconds to be applied after  the  given	 time.
       The pairs of values are sorted in ascending order by time.

       Then  there are 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	POSIX-
       style time zone environment variables.

       Finally,	 there are tzh_ttisgmtcnt UTC/local indicators, each stored as
       a one-byte value; they tell whether  the	 transition  times  associated
       with local time types were specified as UTC or local time, and are used
       when a time zone file is used in handling POSIX-style time  zone	 envi‐
       ronment variables.

       Localtime uses the first standard-time ttinfo structure in the file (or
       simply the first ttinfo structure in the	 absence  of  a	 standard-time
       structure)  if  either tzh_timecnt is zero or the time argument is less
       than the first transition time recorded in the file.

								     TZFILE(5)
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