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    Command:

    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  timezone 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 timezone'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.  Nonblank lines are expected to be of one of three types: rule
    
           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
                   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 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
                        -        equivalent to 0
    
                   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.
    
           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 timezone.  This is the name used in creating the
                 time conversion information file for the zone.
    
           UTCOFF
                 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 timezone or, alter-
                 nately, an amount of time to add to local standard time.  If this
                 field is - then standard time always applies in the timezone.
    
           FORMAT
                 The format for timezone abbreviations in this timezone.  The pair
                 of characters %s is used to show where the "variable part" of the
                 timezone  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 timezone information is gener-
                 ated  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  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.
    
    
    

    FILES

           /usr/local/etc/zoneinfo standard directory used for created files
    
    
    

    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.
    
    
    

    SEE ALSO

           tzfile(5), zdump(8)
    
                                      2010-02-25                            ZIC(8)
    
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