# 2.11BSD#431 - /usr/man/cat8/zic.0

    ZIC(8)		    UNIX Programmer's Manual		   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 out-
    	  side the range of years representable 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 strip-
    	  ping) 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:

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    ZIC(8)		    UNIX Programmer's Manual		   ZIC(8)

         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 abbreviation) means the minimum
    	     year with a representable time value.  The word max-
    	     imum (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 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 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 com-
    	     mand
    		  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

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    ZIC(8)		    UNIX Programmer's Manual		   ZIC(8)

    	     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 stan-
    	     dard 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 abbre-
    	     viations 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.

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    ZIC(8)		    UNIX Programmer's Manual		   ZIC(8)

    	   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 con-
    	   tinuation 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 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 ear-
         liest transition time's rule to ensure that the earliest
         transition 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)

    Printed 11/24/99						4

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