zic(8): more markup fixes
Still need to go over the tables.
This commit is contained in:
uwe
parent
103a2ebfe9
commit
2f0b3b676b
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@ -1,4 +1,4 @@
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.\" $NetBSD: zic.8,v 1.45 2023/12/06 21:42:01 kre Exp $
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.\" $NetBSD: zic.8,v 1.46 2023/12/07 16:16:03 uwe Exp $
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.\" @(#)zic.8 8.6
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.\" This file is in the public domain, so clarified as of
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.\" 2009-05-17 by Arthur David Olson.
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@ -22,7 +22,7 @@
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.Op Fl t Ar file
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.Op Fl v
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.Op Fl y Ar command
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.Op Ar Filename ...
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.Op Ar
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.Sh DESCRIPTION
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The
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.Nm
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@ -30,16 +30,15 @@ program reads text from the file(s) named on the command line
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and creates the timezone information format (TZif) files
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specified in this input.
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If a
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.Ar filename
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.Ar file
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is
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.Ar \&- ,
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.Ql \&- ,
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standard input is read.
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.Pp
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.Sh OPTIONS
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.Bl -tag -width XXXXXXXXXX -compact
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.It Fl \-version
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.Ss Options
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.Bl -tag -width Fl
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.It Fl Fl version
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Output version information and exit.
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.It Fl \-help
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.It Fl Fl help
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Output short usage message and exit.
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.It Fl b Ar bloat
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Output backward-compatibility data as specified by
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@ -47,37 +46,40 @@ Output backward-compatibility data as specified by
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If
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.Ar bloat
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is
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.Dv fat ,
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.Ql fat ,
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generate additional data entries that work around potential bugs or
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incompatibilities in older software, such as software that mishandles
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the 64-bit generated data.
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If
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.Ar bloat
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is
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.Dv slim ,
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.Ql slim ,
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keep the output files small; this can help check for the bugs
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and incompatibilities.
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The default is
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.Dv slim ,
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.Ql slim ,
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as software that mishandles 64-bit data typically
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mishandles timestamps after the year 2038 anyway.
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Also see the
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.Fl r
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option for another way to alter output size.
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.It Fl d Ar directory
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Create time conversion information files in the named directory rather than
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in the standard directory named below.
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Create time conversion information files in the named
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.Ar directory
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rather than in the standard directory named below.
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.It Fl l Ar timezone
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Use the
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Use the
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.Ar timezone
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as local time.
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.Nm
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will act as if the input contained a link line of the form
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.Dl Link timezone localtime
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.Pp
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.D1 Li Link Ar timezone Li localtime
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.Pp
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If
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.Ar timezone
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is
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.Dv \&- ,
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.Ql - ,
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any already-existing link is removed.
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.It Fl L Ar leapsecondfilename
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Read leap second information from the file with the given name.
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@ -85,32 +87,32 @@ If this option is not used,
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no leap second information appears in output files.
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.It Fl p Ar timezone
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Use
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.Ar timezone's
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rules when handling POSIX-format
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TZ strings like
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.Qq EET\&-2EEST
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.Ar timezone Ap s
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rules when handling POSIX-format TZ strings like
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.Ql EET-2EEST
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that lack transition rules.
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.Nm
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will act as if the input contained a link line of the form
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.Dl Link timezone posixrules
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.Pp
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.D1 Li Link Ar timezone Li posixrules
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.Pp
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Unless
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.Ar timezone
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is
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.Dq \&- ,
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.Ql - ,
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this option is obsolete and poorly supported.
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Among other things it should not be used for timestamps after the year 2037,
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and it should not be combined with
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.Fl b Ar slim
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.Fl b Cm slim
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if
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.Va timezone's
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.Ar timezone Ap s
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transitions are at standard time or Universal Time (UT) instead of local time.
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If
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.Ar timezone
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is
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.Dv \&- ,
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.Ql - ,
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any already-existing link is removed.
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.It Fl r Op Ar @lo / Op Ar @hi
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.It Fl r Op Cm @ Ns Ar lo Ns Op Cm /@ Ns Ar hi
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Limit the applicability of output files
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to timestamps in the range from
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.Ar lo
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@ -127,36 +129,36 @@ The output files use UT offset 0 and abbreviation
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.Qq "\*-00"
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in place of the omitted timestamp data.
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For example,
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.Bd -literal
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zic -r @0
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.Ed
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.Pp
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.Dl zic -r @0
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.Pp
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omits data intended for negative timestamps (i.e., before the Epoch), and
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.Bd -literal
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zic -r @0/@2147483648
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.Ed
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.Pp
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.Dl zic -r @0/@2147483648
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.Pp
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outputs data intended only for nonnegative timestamps that fit into
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31-bit signed integers.
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Or using
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Or using
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.Xr date 1 ,
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.Bd -literal
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zic -r @$(date +%s)
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.Ed
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.Pp
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.Dl zic -r @$(date +%s)
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.Pp
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omits data intended for past timestamps.
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Although this option typically reduces the output file's size,
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the size can increase due to the need to represent the timestamp range
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boundaries, particularly if
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.Ar hi
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causes a TZif file to contain explicit entries for
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.Ar pre- hi
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.No pre- Ns Ar hi
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transitions rather than concisely representing them
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with an extended POSIX TZ string.
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Also see the
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.Fl b Ar slim
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.Fl b Cm slim
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option for another way to shrink output size.
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.It Fl R Ar @hi
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.It Fl R Cm @ Ns Ar hi
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Generate redundant trailing explicit transitions for timestamps
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that occur less than
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Ar hi
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.Ar hi
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seconds since the Epoch, even though the transitions could be
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more concisely represented via the extended POSIX TZ string.
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This option does not affect the represented timestamps.
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@ -170,7 +172,7 @@ the named file rather than in the standard location.
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Be more verbose, and complain about the following situations:
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.Bl -dash
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.It
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+The input specifies a link to a link,
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The input specifies a link to a link,
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something not supported by some older parsers, including
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.Nm
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itself through release 2022e.
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@ -189,7 +191,7 @@ Pre-2004 versions of
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prohibit this.
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.It
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A time zone abbreviation uses a
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.Dv %z
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.Ql %z
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format.
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Pre-2015 versions of
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.Nm
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@ -204,19 +206,19 @@ The input contains abbreviations that are mishandled by pre-2018 versions of
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.Nm
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due to a longstanding coding bug.
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These abbreviations include
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.Qq L
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.Ql L
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for
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.Qq Link ,
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.Qq mi
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.Ql Link ,
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.Ql mi
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for
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.Qq min ,
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.Qq Sa
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.Ql min ,
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.Ql Sa
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for
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.Qq Sat ,
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.Ql Sat ,
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and
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.Qq Su
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.Ql Su
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for
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.Qq Sun .
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.Ql Sun .
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.It
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The output file does not contain all the information about the
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long-term future of a timezone, because the future cannot be summarized as
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@ -228,7 +230,7 @@ an extended POSIX TZ string cannot represent.
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.It
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The output contains data that may not be handled properly by client
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code designed for older
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.Xr zic 8
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.Nm
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output formats.
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These compatibility issues affect only timestamps
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before 1970 or after the start of 2038.
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@ -237,8 +239,9 @@ The output contains a truncated leap second table,
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which can cause some older TZif readers to misbehave.
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This can occur if the
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.Fl L
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option is used, and either an Expires line is present or
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the
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option is used, and either an
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.Ql Expires
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line is present or the
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.Fl r
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option is also used.
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.It
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@ -253,35 +256,40 @@ POSIX requires at least 3, and requires implementations to support
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at least 6.
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.It
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An output file name contains a byte that is not an ASCII letter,
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.Qq - ,
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.Qq / ,
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.Ql - ,
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.Ql / ,
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or
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.Qq _ ;
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or it
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.Ql _ ;
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or it contains a file name component that contains more than 14 bytes
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or that starts with
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.Qq - .
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.Ql - .
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.El
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.El
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.Pp
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.\"
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.Ss Zone description file format
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Input files should be text files, that is, they should be a series of
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zero or more lines, each ending in a newline byte and containing at
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most 2048 bytes counting the newline, and without any
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.Dv NUL
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.Tn NUL
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bytes.
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The input text's encoding
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is typically UTF-8 or ASCII; it should have a unibyte representation
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for the POSIX Portable Character Set (PPCS)
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.Rs
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.%U https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap06.html
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.Re
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is typically
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.Tn UTF-8
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or
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.Tn ASCII ;
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it should have a unibyte representation
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for the POSIX Portable Character Set
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.Tn ( PPCS )
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.Pq Lk https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap06.html
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and the encoding's non-unibyte characters should consist entirely of
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non-PPCS bytes.
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Non-PPCS characters typically occur only in comments:
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.No non- Ns Tn PPCS
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bytes.
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.No Non- Ns Tn PPCS
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characters typically occur only in comments:
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although output file names and time zone abbreviations can contain
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nearly any character, other software will work better if these are
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limited to the restricted syntax described under the
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.Op v
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.Fl v
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option.
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.Pp
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Input lines are made up of fields.
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@ -289,12 +297,13 @@ Fields are separated from one another by one or more white space characters.
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The white space characters are space, form feed, carriage return, newline,
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tab, and vertical tab.
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Leading and trailing white space on input lines is ignored.
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An unquoted sharp character (#) in the input introduces a comment which extends
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An unquoted sharp character
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.Pq Ql #
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in the input introduces a comment which extends
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to the end of the line the sharp character appears on.
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White space characters and sharp characters may be enclosed in double
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quotes
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.Pq \&"
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.\" XXX "
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.Pq Ql \*q
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if they're to be used as part of a field.
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Any line that is blank (after comment stripping) is ignored.
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Nonblank lines are expected to be of one of three types:
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@ -303,15 +312,20 @@ rule lines, zone lines, and link lines.
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Names must be in English and are case insensitive.
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They appear in several contexts, and include month and weekday names
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and keywords such as
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.Qq maximum ,
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.Qq only ,
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.Qq Rolling ,
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.Ql maximum ,
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.Ql only ,
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.Ql Rolling ,
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and
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.Qq Zone .
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.Ql Zone .
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A name can be abbreviated by omitting all but an initial prefix; any
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abbreviation must be unambiguous in context.
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.\"
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.\" Rule Line
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.\"
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.Pp
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A rule line has the form
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A
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.Sy rule line
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has the form
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.Pp
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.Bl -column -compact -offset indent "Rule" "NAME" "FROM" "1995" "\&*" "Apr" "lastSun" "2:00w" "1:00d" "LETTER/S"
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.It Rule NAME FROM TO \&- IN ON AT SAVE LETTER/S
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@ -324,119 +338,129 @@ For example:
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.El
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.Pp
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The fields that make up a rule line are:
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.Bl -tag -width "LETTER/S"
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.It NAME
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.Bl -tag -width Ar
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.\"
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.It Ar NAME
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Gives the name of the rule set that contains this line.
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The name must start with a character that is neither
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an ASCII digit nor
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.Ar \&-
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The name must start with a character that is neither an
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.Tn ASCII
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digit nor
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.Ql -
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nor
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.Ar + .
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.Ql + .
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To allow for future extensions,
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an unquoted name should not contain characters from the set
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.Ar !$%&'()*,/:;<=>?@[\e]^`{|}~ .
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.It FROM
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.Ql !$%&'()*,/:;<=>?@[\e]^`{|}~ .
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.\"
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.It Ar FROM
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Gives the first year in which the rule applies.
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Any signed integer year can be supplied; the proleptic Gregorian calendar
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is assumed, with year 0 preceding year 1.
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The word
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.Em minimum
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.Ql minimum
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(or an abbreviation) means the indefinite past.
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The word
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.Em maximum
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.Ql maximum
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(or an abbreviation) means the indefinite future.
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Rules can describe times that are not representable as time values,
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with the unrepresentable times ignored; this allows rules to be portable
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among hosts with differing time value types.
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.It TO
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||||
.\"
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.It Ar TO
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Gives the final year in which the rule applies.
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In addition to
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.Em minimum
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.Ql minimum
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and
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.Em maximum
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.Ql maximum
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||||
(as above),
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the word
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||||
.Em only
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||||
.Ql only
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||||
(or an abbreviation)
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||||
may be used to repeat the value of the
|
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.Em FROM
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||||
.Ar FROM
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||||
field.
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||||
.It \&-
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||||
.\"
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||||
.It Cm \&-
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||||
should be
|
||||
.Qq \&-
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||||
.Ql \&-
|
||||
for compatibility with older versions of
|
||||
.Nm .
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||||
It was previously known as the
|
||||
.Em TYPE
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||||
.Ar TYPE
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||||
field, which could contain values to allow a
|
||||
separate script to further restrict in which
|
||||
.Em types
|
||||
of years the rule would apply.
|
||||
.It IN
|
||||
.\"
|
||||
.It Ar IN
|
||||
Names the month in which the rule takes effect.
|
||||
Month names may be abbreviated.
|
||||
.It ON
|
||||
.\"
|
||||
.It Ar ON
|
||||
Gives the day on which the rule takes effect.
|
||||
Recognized forms include:
|
||||
.Pp
|
||||
.Bl -tag -width lastSun -compact -offset indent
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||||
.It 5
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||||
.Bl -tag -width Li -offset indent -compact
|
||||
.It Li 5
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||||
the fifth of the month
|
||||
.It lastSun
|
||||
.It Li lastSun
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||||
the last Sunday in the month
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||||
.It lastMon
|
||||
.It Li lastMon
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||||
the last Monday in the month
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||||
.It Sun\*[Ge]8
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||||
.It Li Sun>=8
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||||
first Sunday on or after the eighth
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||||
.It Sun\*[Le]25
|
||||
.It Li Sun<=25
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||||
last Sunday on or before the 25th
|
||||
.El
|
||||
.Pp
|
||||
Names of days of the week may be abbreviated or spelled out in full.
|
||||
A weekday name (e.g.,
|
||||
.Qq Sunday )
|
||||
.Ql Sunday )
|
||||
or a weekday name preceded by
|
||||
.Qq last
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||||
.Ql last
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||||
(e.g.,
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||||
.Qq lastSunday )
|
||||
.Ql lastSunday )
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||||
may be abbreviated or spelled out in full.
|
||||
There must be no white space characters within the
|
||||
.Em ON
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||||
.Ar ON
|
||||
field.
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||||
The
|
||||
.Qq <=
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||||
.Ql <=
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||||
and
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||||
.Qq >=
|
||||
.Ql >=
|
||||
constructs can result in a day in the neighboring month;
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||||
for example, the IN-ON combination
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.Qq "Oct Sun>=31"
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||||
tands for the first Sunday on or after October 31,
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for example, the IN\(enON combination
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.Ql "Oct Sun>=31"
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||||
stands for the first Sunday on or after October 31,
|
||||
even if that Sunday occurs in November.
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||||
.It AT
|
||||
.\"
|
||||
.It Ar AT
|
||||
Gives the time of day at which the rule takes effect,
|
||||
relative to 00:00, the start of a calendar day.
|
||||
Recognized forms include:
|
||||
.Pp
|
||||
.Bl -tag -width "00X19X32X13" -compact -offset indent
|
||||
.It 2
|
||||
.Bl -tag -width Li -compact -offset indent
|
||||
.It Li 2
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||||
time in hours
|
||||
.It 2:00
|
||||
.It Li 2:00
|
||||
time in hours and minutes
|
||||
.It 01:28:14
|
||||
.It Li 01:28:14
|
||||
time in hours, minutes, and seconds
|
||||
.It 00:19:32.13
|
||||
.It Li 00:19:32.13
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||||
time with fractional seconds
|
||||
.It 12:00
|
||||
.It Li 12:00
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||||
midday, 12 hours after 00:00
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||||
.It 15:00
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||||
3 PM, 15 hours after 00:00
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||||
.It 24:00
|
||||
.It Li 15:00
|
||||
3
|
||||
.Tn PM ,
|
||||
15 hours after 00:00
|
||||
.It Li 24:00
|
||||
end of day, 24 hours after 00:00
|
||||
.It 260:00
|
||||
.It Li 260:00
|
||||
260 hours after 00:00
|
||||
.It \-2:30
|
||||
.It Li -2:30
|
||||
2.5 hours before 00:00
|
||||
.It \-
|
||||
.It Li -
|
||||
equivalent to 0
|
||||
.El
|
||||
.Pp
|
||||
|
|
@ -447,43 +471,45 @@ rounds times to the nearest integer second
|
|||
to other applications requiring greater precision.
|
||||
The source format does not specify any maximum precision.
|
||||
Any of these forms may be followed by the letter
|
||||
.Em w
|
||||
.Ql w
|
||||
if the given time is local or
|
||||
.Qq wall clock
|
||||
.Dq wall clock
|
||||
time,
|
||||
.Em s
|
||||
.Ql s
|
||||
if the given time is standard time without any adjustment for daylight saving,
|
||||
or
|
||||
.Em u
|
||||
.Ql u
|
||||
(or
|
||||
.Em g
|
||||
.Ql g
|
||||
or
|
||||
.Em z )
|
||||
.Ql z )
|
||||
if the given time is universal time;
|
||||
in the absence of an indicator,
|
||||
local (wall clock) time is assumed.
|
||||
These forms ignore leap seconds; for example,
|
||||
if a leap second occurs at 00:59:60 local time,
|
||||
.Qq "1:00"
|
||||
.Ql "1:00"
|
||||
stands for 3601 seconds after local midnight instead of the usual 3600 seconds.
|
||||
The intent is that a rule line describes the instants when a
|
||||
clock/calendar set to the type of time specified in the
|
||||
.Em AT
|
||||
.Ar AT
|
||||
field would show the specified date and time of day.
|
||||
.It SAVE
|
||||
.\"
|
||||
.It Ar SAVE
|
||||
Gives the amount of time to be added to local standard time when the rule is in
|
||||
effect, and whether the resulting time is standard or daylight saving.
|
||||
This field has the same format as the
|
||||
.Em AT
|
||||
.Ar AT
|
||||
field
|
||||
.Em s
|
||||
.\" XXX: edito?
|
||||
.Ql s
|
||||
for standard time and
|
||||
.Em d
|
||||
.Ql d
|
||||
for daylight saving time.
|
||||
The suffix letter is typically omitted, and defaults to
|
||||
.Em s
|
||||
.Ql s
|
||||
if the offset is zero and to
|
||||
.Em d
|
||||
.Ql d
|
||||
otherwise.
|
||||
Negative offsets are allowed; in Ireland, for example, daylight saving
|
||||
time is observed in winter and has a negative offset relative to
|
||||
|
|
@ -491,27 +517,33 @@ Irish Standard Time.
|
|||
The offset is merely added to standard time; for example,
|
||||
.Nm
|
||||
does not distinguish a 10:30 standard time plus an 0:30
|
||||
.Em SAVE
|
||||
.Ar SAVE
|
||||
from a 10:00 standard time plus a 1:00
|
||||
.Em SAVE .
|
||||
.It LETTER/S
|
||||
.Ar SAVE .
|
||||
.\"
|
||||
.It Ar LETTER/S
|
||||
Gives the
|
||||
.Qq variable part
|
||||
.Dq variable part
|
||||
(for example, the
|
||||
.Qq S
|
||||
.Ql S
|
||||
or
|
||||
.Qq D
|
||||
.Ql D
|
||||
in
|
||||
.Qq EST
|
||||
.Ql EST
|
||||
or
|
||||
.Qq EDT )
|
||||
.Ql EDT )
|
||||
of time zone abbreviations to be used when this rule is in effect.
|
||||
If this field is
|
||||
.Em \&- ,
|
||||
.Ql - ,
|
||||
the variable part is null.
|
||||
.El
|
||||
.\"
|
||||
.\" Zone Line
|
||||
.\"
|
||||
.Pp
|
||||
A zone line has the form:
|
||||
A
|
||||
.Sy zone line
|
||||
has the form:
|
||||
.Pp
|
||||
.Bl -column -compact -offset indent "Zone" "Asia/Amman" "STDOFF" "RULES/SAVE" "FORMAT" "[UNTIL]"
|
||||
Zone NAME STDOFF RULES/SAVE FORMAT [UNTIL]
|
||||
|
|
@ -524,90 +556,108 @@ Zone Asia/Amman 2:00 Jordan EE%sT 2017 Oct 27 1:00
|
|||
.El
|
||||
.Pp
|
||||
The fields that make up a zone line are:
|
||||
.Bl -tag -width "RULES/SAVE"
|
||||
.It NAME
|
||||
.Bl -tag -width Ar
|
||||
.It Ar NAME
|
||||
The name of the timezone.
|
||||
This is the name used in creating the time conversion information file for the
|
||||
timezone.
|
||||
It should not contain a file name component
|
||||
.Qq .
|
||||
.Ql \&.
|
||||
or
|
||||
.Qq .. ;
|
||||
.Ql \&.. ;
|
||||
a file name component is a maximal substring that does not contain
|
||||
.Qq / .
|
||||
.It STDOFF
|
||||
.Ql / .
|
||||
.\"
|
||||
.It Ar STDOFF
|
||||
The amount of time to add to UT to get standard time,
|
||||
without any adjustment for daylight saving.
|
||||
This field has the same format as the
|
||||
.Em AT
|
||||
.Ar AT
|
||||
and
|
||||
.Em SAVE
|
||||
.Ar SAVE
|
||||
fields of rule lines, except without suffix letters;
|
||||
begin the field with a minus sign if time must be subtracted from UT.
|
||||
.It RULES
|
||||
.\"
|
||||
.It Ar RULES
|
||||
The name of the rules that apply in the timezone or,
|
||||
alternatively, a field in the same format as a rule-line SAVE column,
|
||||
giving the amount of time to be added to local standard time
|
||||
alternatively, a field in the same format as a rule-line
|
||||
.Ar SAVE
|
||||
column, giving the amount of time to be added to local standard time
|
||||
and whether the resulting time is standard or daylight saving.
|
||||
If this field is
|
||||
.Em \&-
|
||||
.Ql \&-
|
||||
then standard time always applies.
|
||||
When an amount of time is given, only the sum of standard time and
|
||||
this amount matters.
|
||||
.It FORMAT
|
||||
.It Ar FORMAT
|
||||
The format for time zone abbreviations.
|
||||
The pair of characters
|
||||
.Em %s
|
||||
.Ql %s
|
||||
is used to show where the
|
||||
.Qq variable part
|
||||
.Dq variable part
|
||||
of the time zone abbreviation goes.
|
||||
Alternatively, a format can use the pair of characters
|
||||
.Em %z
|
||||
+to stand for the UT offset in the form
|
||||
.Em \(+- hh ,
|
||||
.Em \(+- hhmm ,
|
||||
.Ql %z
|
||||
to stand for the UT offset in the form
|
||||
.Pf \(+- Em \^hh ,
|
||||
.Pf \(+- Em \^hhmm ,
|
||||
or
|
||||
.Em \(+- hhmmss ,
|
||||
.Pf \(+- Em \^hhmmss ,
|
||||
using the shortest form that does not lose information, where
|
||||
.Em hh ,
|
||||
.Em mm ,
|
||||
and
|
||||
.Em ss
|
||||
are the hours, minutes, and seconds east (+) or west (\-) of UT.
|
||||
are the hours, minutes, and seconds east
|
||||
.Pq \&+
|
||||
or west
|
||||
.Pq \-
|
||||
of UT.
|
||||
Alternatively,
|
||||
a slash
|
||||
.Pq \&/
|
||||
.Pq Ql \&/
|
||||
separates standard and daylight abbreviations.
|
||||
To conform to POSIX, a time zone abbreviation should contain only
|
||||
alphanumeric ASCII characters,
|
||||
.Qq +
|
||||
alphanumeric
|
||||
.Tn ASCII
|
||||
characters,
|
||||
.Ql +
|
||||
and
|
||||
.Qq \&- .
|
||||
.Ql \&- .
|
||||
By convention, the time zone abbreviation
|
||||
.Qq \&-00
|
||||
.Ql \&-00
|
||||
is a placeholder that means local time is unspecified.
|
||||
.It UNTIL
|
||||
.\"
|
||||
.It Ar UNTIL
|
||||
The time at which the UT offset or the rule(s) change for a location.
|
||||
It takes the form of one to four fields YEAR [MONTH [DAY [TIME]]].
|
||||
It takes the form of one to four fields
|
||||
.Ar YEAR Oo
|
||||
.Ar MONTH Oo
|
||||
.Ar DAY Oo
|
||||
.Ar TIME
|
||||
.Oc Oc Oc .
|
||||
If this is specified,
|
||||
the time zone information is generated from the given UT offset
|
||||
and rule change until the time specified, which is interpreted using
|
||||
the rules in effect just before the transition.
|
||||
The month, day, and time of day have the same format as the IN, ON, and AT
|
||||
The month, day, and time of day have the same format as the
|
||||
.Ar IN ,
|
||||
.Ar ON ,
|
||||
and
|
||||
.Ar AT
|
||||
fields of a rule; trailing fields can be omitted, and default to the
|
||||
earliest possible value for the missing fields.
|
||||
.Pp
|
||||
The next line must be a
|
||||
.Qq continuation
|
||||
line; this has the same form as a zone line except that the
|
||||
string
|
||||
.Qq Zone
|
||||
.Sy continuation line ;
|
||||
this has the same form as a zone line except that the string
|
||||
.Ql Zone
|
||||
and the name are omitted, as the continuation line will
|
||||
place information starting at the time specified as the
|
||||
.Em until
|
||||
.Ar UNTIL
|
||||
information in the previous line in the file used by the previous line.
|
||||
Continuation lines may contain
|
||||
.Em until
|
||||
.Ar UNTIL
|
||||
information, just as zone lines do, indicating that the next line is a further
|
||||
continuation.
|
||||
.El
|
||||
|
|
@ -618,25 +668,25 @@ A zone or continuation line
|
|||
.Em L
|
||||
with a named rule set starts with standard time by default:
|
||||
that is, any of
|
||||
.Em L Ns 's
|
||||
.Em L Ap s
|
||||
timestamps preceding
|
||||
.Em L Ns 's
|
||||
.Em L Ap s
|
||||
earliest rule use the rule in effect after
|
||||
.Em L Ns 's
|
||||
.Em L Ap s
|
||||
first transition into standard time.
|
||||
In a single zone it is an error if two rules take effect at the same
|
||||
instant, or if two zone changes take effect at the same instant.
|
||||
.Pp
|
||||
If a continuation line subtracts
|
||||
.Dv N
|
||||
.Ar N
|
||||
seconds from the UT offset after a transition that would be
|
||||
interpreted to be later if using the continuation line's UT offset and
|
||||
rules, the
|
||||
.Em until
|
||||
.Ar UNTIL
|
||||
time of the previous zone or continuation line is interpreted
|
||||
according to the continuation line's UT offset and rules, and any rule
|
||||
that would otherwise take effect in the next
|
||||
.Dv N
|
||||
.Ar N
|
||||
seconds is instead assumed to take effect simultaneously.
|
||||
For example:
|
||||
.Pp
|
||||
|
|
@ -655,11 +705,16 @@ Here, an incorrect reading would be there were two clock changes on 1973-04-29,
|
|||
the first from 02:00 EST (\&-05) to 01:00 CST (\&-06),
|
||||
and the second an hour later from 02:00 CST (\&-06) to 03:00 CDT (\&-05).
|
||||
However,
|
||||
.Nm
|
||||
.Nm
|
||||
interprets this more sensibly as a single transition from 02:00 CST (\&-05) to
|
||||
02:00 CDT (\&-05).
|
||||
.\"
|
||||
.\" Link Line
|
||||
.\"
|
||||
.Pp
|
||||
A link line has the form
|
||||
A
|
||||
.Sy link line
|
||||
has the form
|
||||
.Pp
|
||||
.Bl -column -compact -offset indent "Link" "Europe/Istanbul" "Asia/Istanbul"
|
||||
.It Link TARGET LINK-NAME
|
||||
|
|
@ -672,18 +727,17 @@ For example:
|
|||
.El
|
||||
.Pp
|
||||
The
|
||||
.Em TARGET
|
||||
.Ar TARGET
|
||||
field should appear as the
|
||||
.Em NAME
|
||||
field in some zone line.
|
||||
.Ar NAME
|
||||
field in some zone line or as the
|
||||
.Em LINK-NAME
|
||||
.Ar LINK-NAME
|
||||
field in some link line.
|
||||
The
|
||||
.Em LINK-NAME
|
||||
.Ar LINK-NAME
|
||||
field is used as an alternative name for that zone;
|
||||
it has the same syntax as a zone line's
|
||||
.Em NAME
|
||||
.Ar NAME
|
||||
field.
|
||||
Links can chain together, although the behavior is unspecified if a
|
||||
chain of one or more links does not terminate in a Zone name.
|
||||
|
|
@ -702,10 +756,15 @@ Except for continuation lines,
|
|||
lines may appear in any order in the input.
|
||||
However, the behavior is unspecified if multiple zone or link lines
|
||||
define the same name.
|
||||
.Pp
|
||||
.\"
|
||||
.Ss Leap second file format
|
||||
The file that describes leap seconds can have leap lines and an
|
||||
expiration line.
|
||||
Leap lines have the following form:
|
||||
.\"
|
||||
.\" Leap Line
|
||||
.\"
|
||||
.Sy Leap lines
|
||||
have the following form:
|
||||
.Pp
|
||||
.Bl -column -compat -offset indent "Leap" "YEAR" "MONTH" "DAY" "HH:MM:SS" "CORR""R/S"
|
||||
.It Leap YEAR MONTH DAY HH:MM:SS CORR R/S
|
||||
|
|
@ -718,30 +777,29 @@ For example:
|
|||
.El
|
||||
.Pp
|
||||
The
|
||||
.Em YEAR ,
|
||||
.Em MONTH ,
|
||||
.Em DAY ,
|
||||
.Ar YEAR ,
|
||||
.Ar MONTH ,
|
||||
.Ar DAY ,
|
||||
and
|
||||
.Em HH:MM:SS
|
||||
.Ar HH:MM:SS
|
||||
fields tell when the leap second happened.
|
||||
The
|
||||
.Em CORR
|
||||
.Ar CORR
|
||||
field
|
||||
should be
|
||||
.Qq \&+
|
||||
if a second was added
|
||||
or
|
||||
.Qq \&-
|
||||
.Ql \&+
|
||||
if a second was added or
|
||||
.Ql \&-
|
||||
if a second was skipped.
|
||||
The
|
||||
.Em R/S
|
||||
.Ar R/S
|
||||
field
|
||||
should be (an abbreviation of)
|
||||
.Qq Stationary
|
||||
.Ql Stationary
|
||||
if the leap second time given by the other fields should be interpreted as UTC
|
||||
or
|
||||
(an abbreviation of)
|
||||
.Qq Rolling
|
||||
.Ql Rolling
|
||||
if the leap second time given by the other fields should be interpreted as
|
||||
local (wall clock) time.
|
||||
.Pp
|
||||
|
|
@ -757,8 +815,13 @@ which means rolling leap seconds are not used in practice;
|
|||
also, they are not supported if the
|
||||
.Fl r
|
||||
option is used.
|
||||
.\"
|
||||
.\" Expiration Line
|
||||
.\"
|
||||
.Pp
|
||||
The expiration line, if present, has the form:
|
||||
The
|
||||
.Sy expiration line ,
|
||||
if present, has the form:
|
||||
.Pp
|
||||
.Bl -column -compact -offset indent "Expires" "YEAR" "MONTH" "DAY" "HH:MM:SS"
|
||||
.It Expires YEAR MONTH DAY HH:MM:SS
|
||||
|
|
@ -845,16 +908,16 @@ time.
|
|||
Input files use the format described in this section; output files use
|
||||
.Xr tzfile 5
|
||||
format.
|
||||
.Bl -tag -width /usr/share/zoneinfo -compact
|
||||
.Bl -tag -width Pa -compact
|
||||
.It Pa /etc/localtime
|
||||
Default local timezone file
|
||||
Default local timezone file
|
||||
.It Pa /usr/share/zoneinfo
|
||||
Default timezone information directory
|
||||
.El
|
||||
.Sh NOTES
|
||||
For areas with more than two types of local time,
|
||||
you may need to use local standard time in the
|
||||
.Em AT
|
||||
.Ar AT
|
||||
field of the earliest transition time's rule to ensure that
|
||||
the earliest transition time recorded in the compiled file is correct.
|
||||
.Pp
|
||||
|
|
@ -863,7 +926,7 @@ for a particular timezone,
|
|||
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,
|
||||
.Ic zic
|
||||
.Nm
|
||||
produces a single transition to daylight saving at the new UT offset
|
||||
without any change in local (wall clock) time.
|
||||
To get separate transitions
|
||||
|
|
|
|||
Loading…
Reference in New Issue