tzic(1M) tzic(1M)NAME tzic - time zone compiler SYNOPSIS tzic [-v] [-d directory] [-l localtime] [-p posixrules] [-L leapsecondfilename] [-s] [filename...] DESCRIPTION tzic 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. tzic interprets the following flag options: -v Complain if a year that appears in a data file is out- side the range of years representable by time(2) values. -d directory Create time conversion information files in the named directory rather than in the standard directory named below. -p timezone Use the rules of the given time zone when handling POSIX-format time zone environment variables. tzic acts as if the file contained a link line of the form Link timezone posixrules -l localtime Use the given time zone as local time. tzic acts as if the file contained a link line of the form Link timezone localtime -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. -s Limit time values stored in ouput files to values that are the same whether they are taken to be signed or un- signed. You can use this option to generate files com- patible with the System V Interface Definition (SVID). Input lines are made up of fields. Fields are separated from one another by any number of space characters. Leading and trailing spaces on input lines are ignored. An unquoted April, 1990 1
tzic(1M) tzic(1M)number sign character (#) in the input introduces a comment which extends to the end of the line the number sign charac- ter appears on. Space characters and number sign 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 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 An example is: Rule USA 1969 1973 - Apr lastSun 2:00 1:00 D The fields that make up a rule line are: NAME The (arbitrary) name of the set of rules this rule is part of. FROM 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 maximum (or an abbreviation) means the maximum year with a representable time value. TO The final year in which the rule applies. In ad- dition to minimum and maximum (as above), the word only (or an abbreviation) may be used to re- peat the value of the FROM field. TYPE 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 United States presidential election years. If TYPE is nonpres, the rule applies in years other than U.S. presidential election years. If TYPE is some- thing else, then tzic executes the command yearistype year type to check the type of a year. An exit status of 0 is taken to mean that the year is of the given type; an exit status of 1 is taken to mean that the year is not of the given type. IN The month in which the rule takes effect. Month names may be abbreviated. ON The day on which the rule takes effect. Recog- 2 April, 1990
tzic(1M) tzic(1M)nized forms include: 5 The fifth of the month lastSun The last Sunday in the month lastMon The last Monday in the month Sun>=8 The first Sunday on or after the 8th Sun<=25 The 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 The time of day at which the rule takes effect. Recognized forms include: 2 Time in hours 2:00 Time in hours and minutes 15:00 24-hour time format (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 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, the w and s suffixes are not used). LETTER/S 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] An example is: 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 Greenwich mean time (GMT) to get standard time in this zone. This field has the same format as the AT and SAVE April, 1990 3
tzic(1M) tzic(1M)fields of rule lines. The field must begin 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 gen- erated from the given GMT offset and rule change until the time specified. The next line must be a ``continuation'' line. This line has the same form as a zone line except that the string Zone and the name are omitted be- cause the continuation line places information starting at the time specified as the UNTIL field in the previous line in the file used by the pre- vious line. Continuation lines may contain an UNTIL field, just as zone lines do, to indicate that the next line is a further continuation. A link line has the form Link LINK-FROM LINK-TO An example: Link US/Eastern EST5EDT LINK-FROM The same as the NAME field in some zone line. LINK-TO An alternate name for the same NAME field as above in that zone line. Except for continuation lines, lines may appear in any order in the input. Lines in the file that describe leap seconds have the fol- lowing form: 4 April, 1990
tzic(1M) tzic(1M)Leap YEAR MONTH DAY HH:MM:SS CORR R/S An example is: Leap 1974 Dec 31 23:59 + 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 GMT or (an abbreviation of) Rolling if the leap second time given by the other fields should be intpreted as local wall clock time. 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 ear- liest transition time's rule to ensure that the earliest transition time recorded in the compiled file is correct. FILES /etc/tzic /etc/zoneinfo Standard directory used for created files SEE ALSO tzdump(1M), ctime(3), tzfile(4). April, 1990 5