zic(1M) DG/UX R4.11 zic(1M)
NAME
zic - time zone compiler
SYNOPSIS
zic [-v] [ -d directory ] [ -l timezone ] [ filename ... ]
where:
directory The pathname of a directory containing timezone
information; default = /usr/lib/locale/TZ
timezone The name of a time zone to use as local time
filename The name of the file from which to take input
DESCRIPTION
Zic 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 by any
number of white space characters. Leading and trailing white space
on input lines is ignored. A pound sign (#) in the input introduces
a comment which extends to the end of the line the pound sign appears
on. White space characters and pound signs 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 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
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: 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 s if the given
time is local ``standard'' time; in the absence of w or 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 w and s 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 US/Eastern -5:00 USA E%sT
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 `-' 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 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.
Options
-v Complain if a year that appears in a data file is outside the
range of years representable by system time values (0:00:00 AM
GMT, January 1, 1970, to 3:14:07 AM GMT, January 19, 2038).
-d directory
Create time conversion information files in the directory
directory rather than in the standard directory
/usr/lib/locale/TZ.
-l timezone
Use the time zone timezone as local time. zic will act as if
the file contained a link line of the form
Link timezone localtime
FILES
/usr/lib/locale/TZ standard directory used for created files
SEE ALSO
time(1), ctime(3C).
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.
Licensed material--property of copyright holder(s)