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1996-10-24
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2,363 lines
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 ] [ _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 specified
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 directory 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 out-
side the range of years representable by _t_i_m_e(2) val-
ues.
--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.
Input lines are made up of fields. Fields are sepa-
rated 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 strip-
ping) 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
RRuullee NNAAMMEE FFRROOMM TTOO TTYYPPEE IINN OONN AATT SSAAVVEE LLEETTTTEERR//SS
For example:
Rule USA 1969 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. The
word mmiinniimmuumm (or an abbreviation) means the minimum
year with a representable time value. The word mmaaxx--
iimmuumm (or an abbreviation) means the maximum year
with a representable time value.
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 uusspprreess,
the rule applies in U.S. Presidential election
years; if TTYYPPEE is nnoonnpprreess, the rule applies in years
other than U.S. Presidential election years. If
TTYYPPEE is something else, then _z_i_c executes the com-
mand
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.
OONN Gives the day on which the rule takes effect. Rec-
ognized 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 or ss if
the given time is local "standard" time; in the
absence of ww or ss, wall clock time is assumed.
SSAAVVEE Gives the amount of time to be added to local stan-
dard 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/South-west 9:30 Aus CST 1987 Mar 15 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.
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 abbreviation
goes.
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 specified, the
time zone information is generated from the given GMT
offset and rule change until the time specified.
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 spec-
ified as the UUNNTTIILL field in the previous 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 continua-
tion.
A link line has the form
Link LINK-FROM LINK-TO
For example:
Link US/Eastern EST5EDT
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.
Lines in the file that describes leap seconds have the fol-
lowing form:
LLeeaapp YYEEAARR MMOONNTTHH DDAAYY HHHH::MMMM::SSSS CCOORRRR RR//SS
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 sec-
ond 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 ear-
liest transition time's rule to ensure that the earliest
transition time recorded in the compiled file is correct.
FFIILLEE
/etc/zoneinfo standard directory used for created files
SSEEEE AALLSSOO
newctime(3), tzfile(5), zdump(8)
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