TZCOMP
Section: Maintenance Commands (8)
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NAME
tzcomp - time zone compiler
SYNOPSIS
tzcomp
[
-d
directory ] [
-l
localtime ] [ filename ... ]
DESCRIPTION
Tzcomp
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.
These options are available:
- -d directory
-
Create time conversion information files in the named directory rather than
in the standard directory named below.
- -l localtime
-
Use the given time zone as local time.
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 which 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 MostNA 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.
- TO
-
Gives the last year in which the rule applies.
The word
`only'
may be used to repeat the value of the
FROM
field.
- TYPE
-
Gives the type of year in which the year applies. If
TYPE
is
"-"
then the rule applies in all years between
FROM
and
TO
inclusive.
If
TYPE
is something else, then the command
years from to type
is executed with arguments
from,
to,
and
type
taken from the rule line; the rule applies only in those years
printed by the
years
command.
The distributed
years
command is a shell script that handles year types
uspres
(United States presidential election years)
and
nonpres
(all other years);
other year types may be added by changing the script.
- 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 affect.
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 (although, of course, the 'w' and 's' suffixes are not used).
This field has the same format as the
AT
field.
- 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 FORMAT
For example:
Zone Eastern -5:00MostNAE%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
-
The name of the rule(s) that apply in the time zone.
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.
A link line has the form
Link LINK-FROM LINK-TO
For example:
Link EasternEST5EDT
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.
Lines may appear in any order in the input.
NOTE
For areas with more than two types of local time,
you may get to use local standard time in "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/tzdir standard directory used for created files
SEE ALSO
settz(3), tzfile(5)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- NOTE
-
- FILES
-
- SEE ALSO
-
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Time: 21:49:57 GMT, February 02, 2023