zic


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.
               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

       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.
       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)
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