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Index for Section 8 |
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Alphabetical listing for Z |
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zic(8)
NAME
zic - Time zone compiler
SYNOPSIS
/usr/bin/zic [ -d directory ] [ -l localtime ] [ -v ] [ filename ... ]
FLAGS
-d directory
Create time conversion information files in the named directory rather
than in the standard directory named below.
-l timezone
Use the given time zone as local time. The zic compiler will act as if
the file contained a link line of the form:
link timezone localtime
-v Complain if a year that appears in a data file is outside the range of
years representable by time values.
DESCRIPTION
The zic compiler 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.
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 number sign (#) 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 quotation marks (" ") if they are 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 USA 1969 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. 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 Gives the final year in which the rule applies. In addition to minimum
and maximum (as above), the word only (or an abbreviation) 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
`uspres', the rule applies in U.S. Presidential election years; if TYPE
is `nonpres', the rule applies in years other than U.S. Presidential
election years. If TYPE is something else, then zic executes the
following command to check the type of a year:
yearistype year type
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. 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 w if the given time is
local `wall clock' time or the letter s if the given time is local
`standard' time; in the absence of either the letter w or the letter s,
`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 letter w and w suffixes are not used).
LETTER/S
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:
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 GMT 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 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 -,
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 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
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 US/Eastern EST5EDT
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.
NOTE: 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 compiled
file is correct.
FILES
/etc/zoneinfo
Standard directory used for created files
RELATED INFORMATION
Commands: zdump(8)
Functions: ctime(3)
Files: tzfile(4)