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ZIC(8) ZIC(8) NNAAMMEE zic - time zone compiler SSYYNNOOPPSSIISS zziicc [ --vv ] [ --dd _d_i_r_e_c_t_o_r_y ] [ --ll _l_o_c_a_l_t_i_m_e ] [ --pp _p_o_s_i_x_r_u_l_e_s ] [ --LL _l_e_a_p_s_e_c_o_n_d_f_i_l_e_n_a_m_e ] [ --ss ] [ --yy _c_o_m_m_a_n_d ] [ _f_i_l_e_n_a_m_e ... ] DDEESSCCRRIIPPTTIIOONN _Z_i_c reads text from the file(s) named on the command line and creates the time conversion information files speci- fied in this input. If a _f_i_l_e_n_a_m_e is --, the standard input is read. These options are available: --dd _d_i_r_e_c_t_o_r_y Create time conversion information files in the named directory rather than in the standard direc- tory named below. --ll _t_i_m_e_z_o_n_e Use the given time zone as local time. _Z_i_c will act as if the input contained a link line of the form Link _t_i_m_e_z_o_n_e localtime --pp _t_i_m_e_z_o_n_e Use the given time zone's rules when handling POSIX-format time zone environment variables. _Z_i_c will act as if the input contained a link line of the form Link _t_i_m_e_z_o_n_e posixrules --LL _l_e_a_p_s_e_c_o_n_d_f_i_l_e_n_a_m_e 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. --vv Complain if a year that appears in a data file is outside the range of years representable by _t_i_m_e(2) values. --ss 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. --yy _c_o_m_m_a_n_d Use the given _c_o_m_m_a_n_d rather than yyeeaarriissttyyppee when checking year types (see below). 1 ZIC(8) ZIC(8) 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 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. 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 US 1967 1973 - Apr lastSun 2:00 1:00 D The fields that make up a rule line are: NNAAMMEE Gives the (arbitrary) name of the set of rules this rule is part of. FFRROOMM Gives the first year in which the rule applies. Any integer year can be supplied; the Gregorian calendar is assumed. The word mmiinniimmuumm (or an abbreviation) means the minimum year representable as an integer. The word mmaaxxiimmuumm (or an abbrevia- tion) means the maximum year representable as an integer. Rules can describe times that are not representable as time values, with the unrepre- sentable times ignored; this allows rules to be portable among hosts with differing time value types. TTOO Gives the final year in which the rule applies. In addition to mmiinniimmuumm and mmaaxxiimmuumm (as above), the word oonnllyy (or an abbreviation) may be used to repeat the value of the FFRROOMM field. TTYYPPEE Gives the type of year in which the rule applies. If TTYYPPEE is -- then the rule applies in all years between FFRROOMM and TTOO inclusive. If TTYYPPEE is some- thing else, then _z_i_c executes the command yyeeaarriissttyyppee _y_e_a_r _t_y_p_e 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. IINN Names the month in which the rule takes effect. Month names may be abbreviated. 2 ZIC(8) ZIC(8) OONN 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 OONN field. AATT Gives 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 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 ww if the given time is local "wall clock" time, ss if the given time is local "standard" time, or uu (or gg or zz) if the given time is universal time; in the absence of an indicator, wall clock time is assumed. SSAAVVEE 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 AATT field (although, of course, the ww and ss suffixes are not used). LLEETTTTEERR//SS 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/Adelaide 9:30 Aus CST 1971 Oct 31 2:00 The fields that make up a zone line are: NNAAMMEE The name of the time zone. This is the name used in creating the time conversion information file for the zone. 3 ZIC(8) ZIC(8) GGMMTTOOFFFF The amount of time to add to GMT to get standard time in this zone. This field has the same format as the AATT and SSAAVVEE fields of rule lines; begin the field with a minus sign if time must be subtracted from GMT. RRUULLEESS//SSAAVVEE 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. FFOORRMMAATT The format for time zone abbreviations in this time zone. The pair of characters %%ss is used to show where the "variable part" of the time zone abbrevia- tion goes. Alternately, a slash (/) separates stan- dard and daylight abbreviations. UUNNTTIILL 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 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 missing 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 con- tinuation line will place information starting at the time specified as the UUNNTTIILL field in the previ- ous line in the file used by the previous line. Continuation lines may contain an UUNNTTIILL 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 LLIINNKK--FFRROOMM field should appear as the NNAAMMEE field in some zone line; the LLIINNKK--TTOO field is used as an alternate name for that zone. Except for continuation lines, lines may appear in any order in the input. 4 ZIC(8) ZIC(8) 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 YYEEAARR, MMOONNTTHH, DDAAYY, and HHHH::MMMM::SSSS fields tell when the leap second happened. The CCOORRRR field should be "+" if a second was added or "-" if a second was skipped. The RR//SS 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 interpreted as local wall clock time. NNOOTTEE For areas with more than two types of local time, you may need to use local standard time in the AATT field of the earliest transition time's rule to ensure that the earli- est transition time recorded in the compiled file is cor- rect. FFIILLEE /usr/local/etc/zoneinfo standard directory used for cre- ated files SSEEEE AALLSSOO newctime(3), tzfile(5), zdump(8) 5