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ZIC(8)                      System Manager'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.

       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 charac-
       ter) 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:

       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 mini-
               mum  (or  an abbreviation) means the minimum year with a repre-
               sentable 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 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
               inclusive;  if  TYPE is uspres, the rule applies in U.S. Presi-
               dential 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<&lt;=25   last Sunday on or before the 25th

               Names of days of the week may be abbreviated or spelled out  in
               full.  Note: 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

       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, 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.  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 speci-
             fied, 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 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  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.

OPTIONS
       -v             Complain  if  a year that appears in a data file is out-
                      side the range of years  representable  by  system  time
                      values  (0:00:00  AM GMT, January 1, 1970, to 3:14:07 AM
                      GMT, January 19, 2038).

       -d directory   Create time conversion information files in  the  direc-
                      tory  directory  rather  than  in the standard directory
                      /usr/share/lib/zoneinfo.

       -l timezone    Use the time zone timezone as local time.  zic will  act
                      as if the file contained a link line of the form

                           Link  timezone                   localtime

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

SEE ALSO
       time(1V), ctime(3V), tzfile(5), zdump(8)

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 com-
       piled file is correct.



                               17 November 1987                         ZIC(8)