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NetBSD 6.1.5 - man page for zic (netbsd section 8)

ZIC(8)				   BSD System Manager's Manual				   ZIC(8)

NAME
     zic -- time zone compiler

SYNOPSIS
     zic [--version] [-d directory] [-L leapsecondfilename] [-l localtime] [-p posixrules] [-s]
	 [-v] [-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:
     --version	 Output version information and exit.
     -d directory
		 Create time conversion information files in the named directory rather than in
		 the standard directory named below.
     -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.
     -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 contained a link line of the form
		       Link timezone  posixrules
     -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.
     -v 	 Complain if a year that appears in a data file is outside the range of years
		 representable by time(3) values.  Also complain if a time of 24:00 (which cannot
		 be handled by pre-1998 versions of zic) appears in the input.
     -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 characters 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.

		 Names (such as month names) must be in English and are case insensitive.  Abbre-
		 viations, if used, must be unambiguous in context.

		 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 representable as an integer.
			   The word maximum (or an abbreviation) means the maximum year repre-
			   sentable as an integer.  Rules can describe times that are not repre-
			   sentable as time values, with the unrepresentable times ignored; this
			   allows rules to be portable 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 abbreviation) 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 inclusive.  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.  Recognized
			   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
				 -	  equivalent to 0
			   where hour 0 is midnight at the start of the day, and hour 24 is mid-
			   night 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    [UNTILYEAR [MONTH
		       [DAY [TIME]]]]
		 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, alterna-
			     tively, 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.  Alternatively, a slash (/) separates
			     standard and daylight abbreviations.
		 UNTILYEAR [MONTH [DAY [TIME]]]
			     The time at which the UTC offset or the rule(s) change for a loca-
			     tion.  It is specified as a year, a month, a day, and a time of day.
			     If this is specified, the time zone information is generated 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 fields of a rule; trailing fields can be omitted, and default to
			     the earliest possible value for the missing fields.
		 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 continua-
		 tion line will place information starting at the time specified as the until
		 information in the previous line in the file used by the previous line.  Contin-
		 uation lines may contain until information, 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 alternative 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.

EXTENDED EXAMPLE
     Here is an extended example of zic input, intended to illustrate many of its features.
     # Rule NAME  FROM TO   TYPE IN  ON      AT    SAVE LETTER/S
     Rule   Swiss 1940 only -	 Nov 2	     0:00  1:00 S
     Rule   Swiss 1940 only -	 Dec 31      0:00  0	-
     Rule   Swiss 1941 1942 -	 May Sun>=1  2:00  1:00 S
     Rule   Swiss 1941 1942 -	 Oct Sun>=1  0:00  0

     Rule   EU	  1977 1980 -	 Apr Sun>=1  1:00u 1:00 S
     Rule   EU	  1977 only -	 Sep lastSun 1:00u 0	-
     Rule   EU	  1978 only -	 Oct  1      1:00u 0	-
     Rule   EU	  1979 1995 -	 Sep lastSun 1:00u 0	-
     Rule   EU	  1981 max  -	 Mar lastSun 1:00u 1:00 S
     Rule   EU	  1996 max  -	 Oct lastSun 1:00u 0	-

     # Zone NAME	  GMTOFF  RULES FORMAT UNTIL
     Zone   Europe/Zurich 0:34:08 -	LMT    1848 Sep 12
			  0:29:44 -	BMT    1894 Jun
			  1:00	  Swiss CE%sT  1981
			  1:00	  EU	CE%sT
     Link   Europe/Zurich Switzerland

     In this example, the zone is named Europe/Zurich but it has an alias as Switzerland.  Zurich
     was 34 minutes and 8 seconds west of GMT until 1848-09-12 at 00:00, when the offset changed
     to 29 minutes and 44 seconds.  After 1894-06-01 at 00:00 Swiss daylight saving rules
     (defined with lines beginning with "Rule Swiss") apply, and the GMT offset became one hour.
     From 1981 to the present, EU daylight saving rules have applied, and the UTC offset has
     remained at one hour.

     In 1940, daylight saving time applied from November 2 at 00:00 to December 31 at 00:00.  In
     1941 and 1942, daylight saving time applied from the first Sunday in May at 02:00 to the
     first Sunday in October at 00:00.	The pre-1981 EU daylight-saving rules have no effect
     here, but are included for completeness.  Since 1981, daylight saving has begun on the last
     Sunday in March at 01:00 UTC.  Until 1995 it ended the last Sunday in September at 01:00
     UTC, but this changed to the last Sunday in October starting in 1996.

     For purposes of display, "LMT" and "BMT" were initially used, respectively.  Since Swiss
     rules and later EU rules were applied, the display name for the timezone has been CET for
     standard time and CEST for daylight saving time.

NOTES
     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 compiled file is correct.

     If, for a particular zone, a clock advance caused by the start of daylight saving coincides
     with and is equal to a clock retreat caused by a change in UTC offset, zic produces a single
     transition to daylight saving at the new UTC offset (without any change in wall clock time).
     To get separate transitions use multiple zone continuation lines specifying transition
     instants using universal time.

FILES
     /usr/share/zoneinfo - standard directory used for created files

SEE ALSO
     ctime(3), tzfile(5), zdump(8)

BSD					December 20, 2003				      BSD


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