zic man page on Ubuntu

Man page or keyword search:  
man Server   6591 pages
apropos Keyword Search (all sections)
Output format
Ubuntu logo
[printable version]

ZIC(8)									ZIC(8)

NAME
       zic - time zone compiler

SYNOPSIS
       zic  [  -v  ]  [ -d directory ] [ -l localtime ] [ -p posixrules ] [ -L
       leapsecondfilename ] [ -s ] [ -y command ] [ filename ... ]

DESCRIPTION
       Zic reads text from the file(s) named on the command line  and  creates
       the  time  conversion  information files specified in this input.  If a
       filename is -, the standard input is read.

       These options are available:

       -d directory
	      Create time conversion information files in the named  directory
	      rather than in the standard directory named below.

       -l timezone
	      Use  the	given time zone as local time.	Zic will act as if the
	      input contained a link line of the form

		   Link timezone       localtime

       -p timezone
	      Use the given time zone's rules when handling POSIX-format  time
	      zone  environment	 variables.  Zic will act as if the input con‐
	      tained a link line of the form

		   Link timezone       posixrules

       -L leapsecondfilename
	      Read leap second information from the file with the given	 name.
	      If  this	option is not used, no leap second information appears
	      in output files.

       -v     Complain if a year that appears in a data file  is  outside  the
	      range of years representable by time(2) values.

       -s     Limit  time values stored in output files to values that are the
	      same whether they're taken to be signed or  unsigned.   You  can
	      use this option to generate SVVS-compatible files.

       -y command
	      Use  the given command rather than yearistype when checking year
	      types (see below).

       Input lines are made up of  fields.   Fields  are  separated  from  one
       another	by any number of white space characters.  Leading and trailing
       white space on input lines is ignored.  An unquoted sharp character (#)
       in  the input introduces a comment which extends to the end of the line
       the sharp character appears on.	White space characters and sharp char‐
       acters  may  be	enclosed in double quotes (") if they're to be used as
       part of a field.	 Any line that is blank (after comment	stripping)  is
       ignored.	  Non-blank  lines  are	 expected to be of one of three types:
       rule lines, zone lines, and link lines.

       A rule line has the form

	    Rule  NAME	FROM  TO    TYPE  IN   ON	AT    SAVE  LETTER/S

       For example:

	    Rule  US	1967  1973  -	  Apr  lastSun	2:00  1:00  D

       The fields that make up a rule line are:

       NAME    Gives the (arbitrary) name of the set of	 rules	this  rule  is
	       part of.

       FROM    Gives  the  first  year in which the rule applies.  Any integer
	       year can be supplied; the Gregorian calendar is	assumed.   The
	       word minimum (or an abbreviation) means the minimum year repre‐
	       sentable as an integer.	The word maximum (or an	 abbreviation)
	       means  the maximum year representable as an integer.  Rules can
	       describe times that are not representable as time values,  with
	       the unrepresentable times ignored; this allows rules to be por‐
	       table among hosts with differing time value types.

       TO      Gives the final year in which the rule applies.	In addition to
	       minimum	and maximum (as above), the word only (or an abbrevia‐
	       tion) may be used to repeat the value of the FROM field.

       TYPE    Gives the type of year in which the rule applies.  If TYPE is -
	       then  the  rule applies in all years between FROM and TO inclu‐
	       sive.  If TYPE is something else, then zic executes the command
		    yearistype year type
	       to check the type of a year: an exit status of zero is taken to
	       mean  that the year is of the given type; an exit status of one
	       is taken to mean that the year is not of the given type.

       IN      Names the month in which the rule takes	effect.	  Month	 names
	       may be abbreviated.

       ON      Gives the day on which the rule takes effect.  Recognized forms
	       include:

		    5	     the fifth of the month
		    lastSun  the last Sunday in the month
		    lastMon  the last Monday in the month
		    Sun>=8   first Sunday on or after the eighth
		    Sun<=25  last Sunday on or before the 25th

	       Names of days of the week may be abbreviated or spelled out  in
	       full.  Note that there must be no spaces within the ON field.

       AT      Gives  the  time of day at which the rule takes effect.	Recog‐
	       nized forms include:

		    2	     time in hours
		    2:00     time in hours and minutes
		    15:00    24-hour format time (for times after noon)
		    1:28:14  time in hours, minutes, and seconds

	       where hour 0 is midnight at the start of the day, and  hour  24
	       is  midnight  at the end of the day.  Any of these forms may be
	       followed by the letter w if  the	 given	time  is  local	 "wall
	       clock" time, s if the given time is local "standard" time, or u
	       (or g or z) if the given time is universal time; in the absence
	       of an indicator, wall clock time is assumed.

       SAVE    Gives  the  amount  of  time to be added to local standard time
	       when the rule is in effect.  This field has the same format  as
	       the AT field (although, of course, the w and s suffixes are not
	       used).

       LETTER/S
	       Gives the "variable part" (for example, the "S" or "D" in "EST"
	       or  "EDT") of time zone abbreviations to be used when this rule
	       is in effect.  If this field is -, the variable part is null.

       A zone line has the form

	    Zone  NAME		      GMTOFF  RULES/SAVE  FORMAT  [UNTIL]

       For example:

	    Zone  Australia/Adelaide  9:30    Aus	  CST	  1971 Oct 31 2:00

       The fields that make up a zone line are:

       NAME  The name of the time zone.	 This is the name used in creating the
	     time conversion information file for the zone.

       GMTOFF
	     The  amount  of  time  to add to UTC to get standard time in this
	     zone.  This field has the same format as the AT and  SAVE	fields
	     of	 rule lines; begin the field with a minus sign if time must be
	     subtracted from UTC.

       RULES/SAVE
	     The name of the rule(s) that apply in the time  zone  or,	alter‐
	     nately, an amount of time to add to local standard time.  If this
	     field is - then standard time always applies in the time zone.

       FORMAT
	     The format for time zone abbreviations in this  time  zone.   The
	     pair  of  characters %s is used to show where the "variable part"
	     of the time zone abbreviation goes.   Alternately,	 a  slash  (/)
	     separates standard and daylight abbreviations.

       UNTIL The  time	at  which  the	UTC offset or the rule(s) change for a
	     location.	It is specified as a year, a month, a day, and a  time
	     of	 day.  If this is specified, the time zone information is gen‐
	     erated from the given UTC offset and rule change until  the  time
	     specified.	  The month, day, and time of day have the same format
	     as the IN, ON, and AT columns of a rule; trailing columns can  be
	     omitted, and default to the earliest possible value for the miss‐
	     ing columns.

	     The next line must be a "continuation" line; this	has  the  same
	     form  as  a  zone line except that the string "Zone" and the name
	     are omitted, as the  continuation	line  will  place  information
	     starting at the time specified as the UNTIL field in the previous
	     line in the file used by the previous line.   Continuation	 lines
	     may  contain  an  UNTIL  field, just as zone lines do, indicating
	     that the next line is a further continuation.

       A link line has the form

	    Link  LINK-FROM	   LINK-TO

       For example:

	    Link  Europe/Istanbul  Asia/Istanbul

       The LINK-FROM field should appear as the NAME field in some zone	 line;
       the LINK-TO field is used as an alternate name for that zone.

       Except  for  continuation  lines,  lines may appear in any order in the
       input.

       Lines in the file that describes leap seconds have the following form:

	    Leap  YEAR	MONTH  DAY  HH:MM:SS  CORR  R/S

       For example:

	    Leap  1974	Dec    31   23:59:60  +	    S

       The YEAR, MONTH, DAY, and HH:MM:SS fields tell  when  the  leap	second
       happened.  The CORR field should be "+" if a second was added or "-" if
       a second was skipped.  The R/S field should  be	(an  abbreviation  of)
       "Stationary"  if	 the leap second time given by the other fields should
       be interpreted as UTC or (an abbreviation of)  "Rolling"	 if  the  leap
       second  time  given  by the other fields should be interpreted as local
       wall clock time.

NOTE
       For areas with more than two types of local time, you may need  to  use
       local  standard	time in the AT field of the earliest transition time's
       rule to ensure that the earliest transition time recorded in  the  com‐
       piled file is correct.

FILE
       /usr/share/zoneinfo     standard directory used for created files

SEE ALSO
       ctime(3), zdump(1)

									ZIC(8)
[top]

List of man pages available for Ubuntu

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net