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ZIC(8)											   ZIC(8)

NAME
       zic - time zone compiler

SYNOPSIS
       zic [ -v ] [ -d directory ] [ -l localtime ] [ 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  file  contained	a
	      link line of the form

		   Link timezone       localtime

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

	      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.

       A rule line has the form

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

       For example:

	    Rule  USA	1969  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.	The word minimum (or an abbrevia-
	       tion) means the minimum year with a representable time value.   The  word  maximum
	       (or an abbreviation) means the maximum year with a representable time value.

       TO      Gives  the final year in which the rule applies.  In addition to minimum and maxi-
	       mum (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 year applies.  If TYPE is - then the rule
	       applies in all years between FROM and TO inclusive; if TYPE is  uspres,	the  rule
	       applies	in U.S. Presidential election years; if TYPE is nonpres, the rule applies
	       in years other than U.S. Presidential election years.  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 affect.  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

	       Any of these forms may be followed by the letter w if  the  given  time	is  local
	       ``wall  clock''	time  or  s  if the given time is local ``standard'' time; in the
	       absence of w or s, 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/South-west	9:30	Aus	    CST     1987 Mar 15 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 GMT 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 GMT.

       RULES/SAVE
	     The  name	of  the rule(s) that apply in the time zone or, alternately, 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.
	     UNTIL  The time at which the GMT 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 generated from the given GMT offset and rule change until
	     the time specified.

	     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 pre-
	     vious 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  con-
	     tinuation.

       A link line has the form

	    Link  LINK-FROM   LINK-TO

       For example:

	    Link  US/Eastern  EST5EDT

       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.

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 transi-
       tion time recorded in the compiled file is correct.

FILES
       /usr/share/zoneinfostandard directory used for created files

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

											   ZIC(8)
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