[tz] [PROPOSED] Merge some changes from man-pages project
Paul Eggert
eggert at cs.ucla.edu
Tue Jun 19 01:28:40 UTC 2018
Make some minor formatting changes to be more like man-pages.
* tzfile.5: Break a line the same place that man-pages does.
* zdump.8, zic.8: Use bold, not italics, for command and function
names. Do not capitalize command names. Add a section header
OPTIONS. Document --help. Fix some problems with fonts. Don’t
quote "SEE ALSO", and don’t mention newctime(3).
Put FILES before NOTES, and format a la man-pages.
* zic.8: Also, do some fixes of our own, noticed while merging the
above. Use real life US Rule, not an invented one. Write
“UTOFF”, not “GMTOFF” (man-pages used “UTCOFF” but it’s not
necessarily UTC either). Quote more carefully.
---
tzfile.5 | 3 +-
zdump.8 | 22 ++++++++------
zic.8 | 88 ++++++++++++++++++++++++++++++++------------------------
3 files changed, 66 insertions(+), 47 deletions(-)
diff --git a/tzfile.5 b/tzfile.5
index 13213d2..2e6c3aa 100644
--- a/tzfile.5
+++ b/tzfile.5
@@ -181,7 +181,8 @@ use two minor extensions to the POSIX TZ format, as described in
.BR newtzset (3).
First, the hours part of its transition times may be signed and range from
\*-167 through 167 instead of the POSIX-required unsigned values
-from 0 through 24. Second, DST is in effect all year if it starts
+from 0 through 24.
+Second, DST is in effect all year if it starts
January 1 at 00:00 and ends December 31 at 24:00 plus the difference
between daylight saving and standard time.
.PP
diff --git a/zdump.8 b/zdump.8
index 833dd54..92e9e62 100644
--- a/zdump.8
+++ b/zdump.8
@@ -18,16 +18,19 @@ zdump \- time zone dumper
..
.ie \n(.g .ds - \f(CW-\fP
.el ds - \-
-.I Zdump
-prints the current time in each
+The
+.B zdump
+program prints the current time in each
.I zonename
named on the command line.
-.PP
-These options are available:
+.SH OPTIONS
.TP
-.BI "\*-\*-version"
+.B \*-\*-version
Output version information and exit.
.TP
+.B \*-\*-help
+Output short usage message and exit.
+.TP
.B \*-i
.I "(This option is experimental: its behavior may change in future versions.)"
Output a description of time intervals. For each
@@ -68,7 +71,7 @@ except omit the times relative to the extreme time values.
This generates output that is easier to compare to that of
implementations with different time representations.
.TP
-.BI "\*-c " [loyear,]hiyear
+.BI "\*-c " \fR[\fIloyear , \fR]\fIhiyear
Cut off interval output at the given year(s).
Cutoff times are computed using the proleptic Gregorian calendar with year 0
and with Universal Time (UT) ignoring leap seconds.
@@ -80,7 +83,7 @@ of 1970 includes the transition.
The default cutoff is
.BR \*-500,2500 .
.TP
-.BI "\*-t " [lotime,]hitime
+.BI "\*-t " \fR[\fIlotime , \fR]\fIhitime
Cut off interval output at the given time(s),
given in decimal seconds since 1970-01-01 00:00:00
Coordinated Universal Time (UTC).
@@ -220,7 +223,8 @@ for newer and
.q "UT"
for older timestamps, partly because the exact date of the
introduction of UTC is problematic.
-.SH "SEE ALSO"
-newctime(3), tzfile(5), zic(8)
+.SH SEE ALSO
+.BR tzfile (5),
+.BR zic (8)
.\" This file is in the public domain, so clarified as of
.\" 2009-05-17 by Arthur David Olson.
diff --git a/zic.8 b/zic.8
index 00d4267..3e33618 100644
--- a/zic.8
+++ b/zic.8
@@ -28,27 +28,30 @@ zic \- time zone compiler
. ds :
. ds - \-
.\}
-.I Zic
-reads text from the file(s) named on the command line
+The
+.B zic
+program reads text from the file(s) named on the command line
and creates the time conversion information files specified in this input.
If a
.I filename
is
.q "\*-" ,
-the standard input is read.
-.PP
-These options are available:
+standard input is read.
+.SH OPTIONS
.TP
-.BI "\*-\*-version"
+.B "\*-\*-version"
Output version information and exit.
.TP
+.B \*-\*-help
+Output short usage message and exit.
+.TP
.BI "\*-d " directory
Create time conversion information files in the named directory rather than
in the standard directory named below.
.TP
.BI "\*-l " timezone
Use the given time zone as local time.
-.I Zic
+.B zic
will act as if the input contained a link line of the form
.sp
.ti +.5i
@@ -57,7 +60,7 @@ Link \fItimezone\fP localtime
.BI "\*-p " timezone
Use the given time zone's rules when handling POSIX-format
time zone environment variables.
-.I Zic
+.B zic
will act as if the input contained a link line of the form
.sp
.ti +.5i
@@ -80,17 +83,17 @@ The input specifies a link to a link.
.PP
A year that appears in a data file is outside the range
of years representable by
-.IR time (2)
+.BR time (2)
values.
.PP
A time of 24:00 or more appears in the input.
Pre-1998 versions of
-.I zic
+.B zic
prohibit 24:00, and pre-2007 versions prohibit times greater than 24:00.
.PP
A rule goes past the start or end of the month.
Pre-2004 versions of
-.I zic
+.B zic
prohibit this.
.PP
The output file does not contain all the information about the
@@ -102,7 +105,7 @@ represented.
.PP
The output contains data that may not be handled properly by client
code designed for older
-.I zic
+.B zic
output formats. These compatibility issues affect only timestamps
before 1970 or after the start of 2038.
.PP
@@ -148,7 +151,7 @@ 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:
+Nonblank lines are expected to be of one of three types:
rule lines, zone lines, and link lines.
.PP
Names must be in English and are case insensitive.
@@ -165,14 +168,14 @@ abbreviation must be unambiguous in context.
A rule line has the form
.nf
.ti +.5i
-.ta \w'Rule\0\0'u +\w'NAME\0\0'u +\w'FROM\0\0'u +\w'1973\0\0'u +\w'TYPE\0\0'u +\w'Apr\0\0'u +\w'lastSun\0\0'u +\w'2:00s\0\0'u +\w'1:00d\0\0'u
+.ta \w'Rule\0\0'u +\w'NAME\0\0'u +\w'FROM\0\0'u +\w'1973\0\0'u +\w'TYPE\0\0'u +\w'Apr\0\0'u +\w'lastSun\0\0'u +\w'2:00w\0\0'u +\w'1:00d\0\0'u
.sp
Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
.sp
For example:
.ti +.5i
.sp
-Rule US 1967 1973 \*- Apr lastSun 2:00s 1:00d D
+Rule US 1967 1973 \*- Apr lastSun 2:00w 1:00d D
.sp
.fi
The fields that make up a rule line are:
@@ -220,7 +223,7 @@ field.
should be
.q \*-
and is present for compatibility with older versions of
-.I zic
+.B zic
in which it could contain year types.
.TP
.B IN
@@ -274,7 +277,7 @@ Recognized forms include:
where hour 0 is midnight at the start of the day,
and hour 24 is midnight at the end of the day.
Although
-.I zic
+.B zic
rounds times to the nearest integer second
(breaking ties to the even integer), the fractions may be useful
to other applications requiring greater precision.
@@ -321,7 +324,7 @@ Negative offsets are allowed; in Ireland, for example, daylight saving
time is observed in winter and has a negative offset relative to
Irish Standard Time.
The offset is merely added to standard time; for example,
-.I zic
+.B zic
does not distinguish a 10:30 standard time plus an 0:30
.B SAVE
from a 10:00 standard time plus a 1:00
@@ -347,8 +350,8 @@ A zone line has the form
.sp
.nf
.ti +.5i
-.ta \w'Zone\0\0'u +\w'Asia/Amman\0\0'u +\w'GMTOFF\0\0'u +\w'Jordan\0\0'u +\w'FORMAT\0\0'u
-Zone NAME GMTOFF RULES FORMAT [UNTIL]
+.ta \w'Zone\0\0'u +\w'Asia/Amman\0\0'u +\w'UTOFF\0\0'u +\w'Jordan\0\0'u +\w'FORMAT\0\0'u
+Zone NAME UTOFF RULES FORMAT [UNTIL]
.sp
For example:
.sp
@@ -357,7 +360,7 @@ Zone Asia/Amman 2:00 Jordan EE%sT 2017 Oct 27 01:00
.sp
.fi
The fields that make up a zone line are:
-.TP "\w'GMTOFF'u"
+.TP "\w'UTOFF'u"
.B NAME
The name of the time zone.
This is the name used in creating the time conversion information file for the
@@ -369,7 +372,7 @@ or
a file name component is a maximal substring that does not contain
.q "/" .
.TP
-.B GMTOFF
+.B UTOFF
The amount of time to add to UT to get standard time in this zone.
This field has the same format as the
.B AT
@@ -413,7 +416,10 @@ Alternatively,
a slash (/)
separates standard and daylight abbreviations.
To conform to POSIX, a time zone abbreviation should contain only
-alphanumeric ASCII characters, "+" and "\*-".
+alphanumeric ASCII characters,
+.q "+"
+and
+.q "\*-".
.TP
.B UNTIL
The time at which the UT offset or the rule(s) change for a location.
@@ -518,7 +524,7 @@ if the leap second time given by the other fields should be interpreted as
local wall clock time.
.SH "EXTENDED EXAMPLE"
Here is an extended example of
-.I zic
+.B zic
input, intended to illustrate many of its features.
In this example, the EU rules are for the European Union
and for its predecessor organization, the European Communities.
@@ -539,8 +545,8 @@ Rule EU 1979 1995 \*- Sep lastSun 1:00u 0 \*-
Rule EU 1981 max \*- Mar lastSun 1:00u 1:00 S
Rule EU 1996 max \*- Oct lastSun 1:00u 0 \*-
.sp
-.ta \w'# Zone\0\0'u +\w'Europe/Zurich\0\0'u +\w'GMTOFF\0\0'u +\w'0:34:08\0\0'u +\w'FORMAT\0\0'u
-# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+.ta \w'# Zone\0\0'u +\w'Europe/Zurich\0\0'u +\w'0:34:08\0\0'u +\w'RULES\0\0'u +\w'FORMAT\0\0'u
+# Zone NAME UTOFF RULES FORMAT [UNTIL]
Zone Europe/Zurich 0:34:08 \*- LMT 1853 Jul 16
0:29:46 \*- BMT 1894 Jun
1:00 Swiss CE%sT 1981
@@ -556,8 +562,9 @@ seconds east of UT until 1853-07-16 at 00:00, when the legal offset
was changed to 7\(de\|26\(fm\|22.50\(sd; although this works out to
0:29:45.50, the input format cannot represent fractional seconds so it
is rounded here. After 1894-06-01 at 00:00 the UT offset became one hour
-and Swiss daylight saving rules (defined with lines beginning with "Rule
-Swiss") apply. From 1981 to the present, EU daylight saving rules have
+and Swiss daylight saving rules (defined with lines beginning with
+.q "Rule Swiss")
+apply. From 1981 to the present, EU daylight saving rules have
applied, and the UTC offset has remained at one hour.
.PP
In 1941 and 1942, daylight saving time applied from the first Monday
@@ -568,11 +575,21 @@ saving has begun on the last Sunday in March at 01:00 UTC.
Until 1995 it ended the last Sunday in September at 01:00 UTC,
but this changed to the last Sunday in October starting in 1996.
.PP
-For purposes of
-display, "LMT" and "BMT" were initially used, respectively. Since
+For purposes of display,
+.q "LMT"
+and
+.q "BMT"
+were initially used, respectively. Since
Swiss rules and later EU rules were applied, the display name for the
time zone has been CET for standard time and CEST for daylight saving
time.
+.SH FILES
+.TP
+.I /etc/localtime
+Default local time zone file.
+.TP
+.I /usr/share/zoneinfo
+Default time zone information directory.
.SH NOTES
For areas with more than two types of local time,
you may need to use local standard time in the
@@ -585,17 +602,14 @@ for a particular zone,
a clock advance caused by the start of daylight saving
coincides with and is equal to
a clock retreat caused by a change in UT offset,
-.IR zic
+.B zic
produces a single transition to daylight saving at the new UT offset
(without any change in wall clock time).
To get separate transitions
use multiple zone continuation lines
specifying transition instants using universal time.
-.SH FILES
-.ta \w'/usr/share/zoneinfo\0\0'u
-/etc/localtime default local time zone file
-/usr/share/zoneinfo default time zone information directory
-.SH "SEE ALSO"
-newctime(3), tzfile(5), zdump(8)
+.SH SEE ALSO
+.BR tzfile (5),
+.BR zdump (8)
.\" This file is in the public domain, so clarified as of
.\" 2009-05-17 by Arthur David Olson.
--
2.17.1
More information about the tz
mailing list