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man:zic

ZIC(8) Linux System Administration ZIC(8)

NAME

     zic - timezone compiler

SYNOPSIS

     zic [-v] [-d directory] [-l localtime] [-p posixrules]
         [-L leapsecondfilename] [-s] [-y command] [filename...]

DESCRIPTION

     The  zic  program 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 -, standard input is read.
     These options are available:
  1. d directory

Create time conversion information files in the named directory

            rather than in the standard directory named below.
  1. 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
  1. 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
  1. 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.
  1. v Complain if a year that appears in a data file is outside the

range of years representable by time(2) values.

  1. 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.
  1. 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
     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  US    1967  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.   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
             inclusive.   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  mid-
     night 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 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 timezone 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                UTCOFF  RULES/SAVE  FORMAT  [UNTIL]
     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 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.
     Lines in the file that describes leap seconds have the following form:
     Leap  YEAR  MONTH  DAY  HH:MM:SS  CORR  R/S
     For example:
     Leap  1974  Dec    31   23:59:60  +     S
     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)

COLOPHON

     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
     https://www.kernel.org/doc/man-pages/.
                                2010-02-25                            ZIC(8)
/data/webs/external/dokuwiki/data/pages/man/zic.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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