[src/trunk]: src/lib/libc/time welcome to tzcond-2016f

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/28a616e3577c
branches:  trunk
changeset: 347793:28a616e3577c
user:      christos <christos%NetBSD.org@localhost>
date:      Fri Sep 16 17:12:06 2016 +0000

description:
welcome to tzcond-2016f

diffstat:

 lib/libc/time/Makefile       |    2 +-
 lib/libc/time/NEWS           |  129 ++++++++
 lib/libc/time/Theory         |    7 +-
 lib/libc/time/tz-art.htm     |  247 ++++++++------
 lib/libc/time/tz-how-to.html |  680 +++++++++++++++++++++++++++++++++++++++++++
 lib/libc/time/tz-link.htm    |  163 +++++----
 lib/libc/time/zic.c          |   64 +++-
 7 files changed, 1097 insertions(+), 195 deletions(-)

diffs (truncated from 1718 to 300 lines):

diff -r aa71662fc4a0 -r 28a616e3577c lib/libc/time/Makefile
--- a/lib/libc/time/Makefile    Fri Sep 16 15:24:47 2016 +0000
+++ b/lib/libc/time/Makefile    Fri Sep 16 17:12:06 2016 +0000
@@ -5,7 +5,7 @@
 PACKAGE=       tzcode
 
 # Version numbers of the code and data distributions.
-VERSION=       2016b
+VERSION=       2016f
 
 # Email address for bug reports.
 BUGEMAIL=      tz%iana.org@localhost
diff -r aa71662fc4a0 -r 28a616e3577c lib/libc/time/NEWS
--- a/lib/libc/time/NEWS        Fri Sep 16 15:24:47 2016 +0000
+++ b/lib/libc/time/NEWS        Fri Sep 16 17:12:06 2016 +0000
@@ -1,7 +1,136 @@
 News for the tz database
 
+Release 2016f - 2016-07-05 16:26:51 +0200
+
+  Changes affecting future time stamps
+
+    The Egyptian government changed its mind on short notice, and
+    Africa/Cairo will not introduce DST starting 2016-07-07 after all.
+    (Thanks to Mina Samuel.)
+
+    Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
+    (Thanks to Stepan Golosunov.)
+
+  Changes to past and future time stamps
+
+    Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
+    abbreviations instead of invented ones.
+
+  Changes affecting past time stamps
+
+    Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
+    (Thanks to Stepan Golosunov.)
+
+
+Release 2016e - 2016-06-14 08:46:16 -0700
+
+  Changes affecting future time stamps
+
+    Africa/Cairo observes DST in 2016 from July 7 to the end of October.
+    Guess October 27 and 24:00 transitions.  (Thanks to Steffen Thorsen.)
+    For future years, guess April's last Thursday to October's last
+    Thursday except for Ramadan.
+
+  Changes affecting past time stamps
+
+    Locations while uninhabited now use '-00', not 'zzz', as a
+    placeholder time zone abbreviation.  This is inspired by Internet
+    RFC 3339 and is more consistent with numeric time zone
+    abbreviations already used elsewhere.  The change affects several
+    arctic and antarctic locations, e.g., America/Cambridge_Bay before
+    1920 and Antarctica/Troll before 2005.
+
+    Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
+    at 03:00, not 23:00 the previous day.  (Thanks to Michael Deckers.)
+
+  Changes to code
+
+    zic now outputs a dummy transition at time 2**31 - 1 in zones
+    whose POSIX-style TZ strings contain a '<'.  This mostly works
+    around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
+    (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
+
+  Changes affecting documentation and commentary
+
+    tz-link.htm says why governments should give plenty of notice for
+    time zone or DST changes, and refers to Matt Johnson's blog post.
+
+    tz-link.htm mentions Tzdata for Elixir.  (Thanks to Matt Johnson.)
+
+
+Release 2016d - 2016-04-17 22:50:29 -0700
+
+  Changes affecting future time stamps
+
+    America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
+    (Thanks to Alexander Krivenyshev for the heads-up.)
+
+    Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
+    (Thanks to Alexander Krivenyshev and Matt Johnson.)
+
+    New zone Asia/Tomsk, split off from Asia/Novosibirsk.  It covers
+    Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
+    at 02:00.  (Thanks to Stepan Golosunov.)
+
+  Changes affecting past time stamps
+
+    New zone Europe/Kirov, split off from Europe/Volgograd.  It covers
+    Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
+    1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
+    the same change.  (Thanks to Stepan Golosunov.)
+
+    Russia and nearby locations had daylight-saving transitions on
+    1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
+    1992-03-28 at 23:00 and 1992-09-26 at 23:00.  (Thanks to Stepan
+    Golosunov.)
+
+    Many corrections to historical time in Kazakhstan from 1991
+    through 2005.  (Thanks to Stepan Golosunov.)  Replace Kazakhstan's
+    invented time zone abbreviations with numeric abbreviations.
+
+  Changes to commentary
+
+    Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
+
+
+Release 2016c - 2016-03-23 00:51:27 -0700
+
+  Changes affecting future time stamps
+
+    Azerbaijan no longer observes DST.  (Thanks to Steffen Thorsen.)
+
+    Chile reverts from permanent to seasonal DST.  (Thanks to Juan
+    Correa for the heads-up, and to Tim Parenti for corrections.)
+    Guess that future transitions are August's and May's second
+    Saturdays at 24:00 mainland time.  Also, call the period from
+    2014-09-07 through 2016-05-14 daylight saving time instead of
+    standard time, as that seems more appropriate now.
+
+  Changes affecting past time stamps
+
+    Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
+    +02/+03 on 1989-03-26, not 1991-03-31.  Europe/Volgograd changed
+    from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
+    (Thanks to Stepan Golosunov.)
+
+  Changes to commentary
+
+    Several updates and URLs for historical and proposed Russian changes.
+    (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
+
+
 Release 2016b - 2016-03-12 17:30:14 -0800
 
+  Compatibility note
+
+    Starting with release 2016b, some data entries cause zic implementations
+    derived from tz releases 2005j through 2015e to issue warnings like
+    "time zone abbreviation differs from POSIX standard (+03)".
+    These warnings should not otherwise affect zic's output and can safely be
+    ignored on today's platforms, as the warnings refer to a restriction in
+    POSIX.1-1988 that was removed in POSIX.1-2001.  One way to suppress the
+    warnings is to upgrade to zic derived from tz releases 2015f and later.
+
   Changes affecting future time stamps
 
     New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
diff -r aa71662fc4a0 -r 28a616e3577c lib/libc/time/Theory
--- a/lib/libc/time/Theory      Fri Sep 16 15:24:47 2016 +0000
+++ b/lib/libc/time/Theory      Fri Sep 16 17:12:06 2016 +0000
@@ -227,9 +227,10 @@
                        name identifying each zone and append 'T', 'ST', etc.
                        as before; e.g. 'VLAST' for VLAdivostok Summer Time.
 
-       Use UT (with time zone abbreviation 'zzz') for locations while
-               uninhabited.  The 'zzz' mnemonic is that these locations are,
-               in some sense, asleep.
+       Use UT (with time zone abbreviation '-00') for locations while
+               uninhabited.  The leading '-' is a flag that the time
+               zone is in some sense undefined; this notation is
+               derived from Internet RFC 3339.
 
 Application writers should note that these abbreviations are ambiguous
 in practice: e.g. 'CST' has a different meaning in China than
diff -r aa71662fc4a0 -r 28a616e3577c lib/libc/time/tz-art.htm
--- a/lib/libc/time/tz-art.htm  Fri Sep 16 15:24:47 2016 +0000
+++ b/lib/libc/time/tz-art.htm  Fri Sep 16 17:12:06 2016 +0000
@@ -8,16 +8,23 @@
 </head>
 <body>
 <h1>Time and the Arts</h1>
-<p>
-This file is in the public domain, so clarified as of
-2009-05-17 by Arthur David Olson.
-</p>
-<p>
-Please send corrections to this web page to the
-<a href="mailto:tz%iana.org@localhost";>time zone mailing list</a>.</p>
-<p>
-See also <a href="tz-link.htm">Sources for Time Zone and Daylight Saving Time Data</a>.</p>
-<hr>
+<h2>Documentaries</h2>
+<ul>
+<li>
+"<a href="https://www.youtube.com/watch?v=84aWtseb2-4";>Daylight
+Saving Time Explained</a>" (2011; 6:39) lightly covers daylight saving
+time's theory, history, pros and cons. Among other things, it explains
+Arizona's daylight-saving enclaves quite well.</li>
+<li>
+"<a href="https://www.youtube.com/watch?v=-5wpm-gesOY";>The Problem
+with Time &amp; Timezones &ndash; Computerphile</a>" (2013; 10:12) delves
+into problems that programmers have with timekeeping.</li>
+<li>
+"About Time" (1962; 53 minutes) is part of the the
+Bell Science extravaganza, with Frank Baxter, Richard Deacon, and Les Tremayne.
+(<a href="http://www.imdb.com/title/tt0154110/";>IMDb entry</a>.)</li>
+</ul>
+<h2>Music</h2>
 <p>
 Data on recordings of "Save That Time," Russ Long, Serrob Publishing, BMI:</p>
 <table>
@@ -246,8 +253,80 @@
 <tr><td><a href="http://www.allmusic.com/album/youre-getting-better-the-word-jazz-dot-masters-mw0000736197";>AMG Rating</a></td><td>4.5 stars</td></tr>
 <tr><td>Notes</td><td>Includes the piece "What Time Is It"
 ("He knew what time it was everywhere...that counted").</td></tr>
-<tr><td>&nbsp;</td></tr>
+</table>
+
+<h2>TV episodes</h2>
 
+<ul>
+<li>
+An episode of <em>The Adventures of Superman</em> entitled "The Mysterious
+Cube," first aired 1958-02-24, had Superman convincing the controllers
+of the Arlington Time Signal to broadcast ahead of actual time;
+doing so got a crook trying to be declared dead to
+emerge a bit too early from the titular enclosure.
+</li>
+<li>
+The 1960s ITC television series <em>The Prisoner</em> included an episode
+entitled "The Chimes of Big Ben" in which our protagonist tumbled to
+the fraudulent nature of a Poland-to-England escape upon hearing "Big
+Ben" chiming on Polish local time.
+</li>
+<li>
+The series <em>Seinfeld</em> included an episode entitled "The Susie," first
+broadcast 1997-02-13, in which Kramer decides that daylight saving time
+isn't coming fast enough, so he sets his watch ahead an hour.
+</li>
+<li>
+The "20 Hours in America" episode of <em>The West Wing</em>,
+first aired 2002-09-25,
+saw White House staffers stranded in Indiana; they thought they had time to
+catch Air Force One but were done in by intra-Indiana local time changes.
+</li>
+<li>
+"In what time zone would you find New York City?" was a $200 question on
+the 1999-11-13 United States airing of <em>Who Wants to Be a Millionaire?</em>,
+and "In 1883, what industry led the movement to divide the U.S. into four time
+zones?" was a $32,000 question on the 2001-05-23 United States airing of
+the same show. At this rate, the million-dollar time-zone
+question should have been asked 2002-06-04.
+</li>
+<li>
+A private jet's mid-flight change of time zones distorts Alison Dubois'
+premonition in the "We Had a Dream" episode of <em>Medium</em>
+(originally aired 2007-02-28).
+</li>
+<li>
+In the <em>30 Rock</em> episode "Anna Howard Shaw Day"
+(first broadcast 2010-02-11),
+Jack Donaghy's date realizes that a Geneva-to-New-York business phone call
+received in the evening must be fake given the difference in local times.
+</li>
+<li>
+In the "Run by the Monkeys" episode of <em>Da Vinci's Inquest</em>
+(first broadcast 2002-11-17),
+a witness in a five-year-old fire case realizes they may not have set
+their clock back when daylight saving ended on the day of the fire,
+introducing the possibility of an hour when arson might have occurred.
+</li>
+<li>
+In "The Todd Couple" episode of <em>Outsourced</em> (first aired 2011-02-10),
+Manmeet sets up Valentine's Day teledates for 6:00 and 9:00pm;
+since one is with a New Yorker and the other with a San Franciscan,
+hilarity ensues.
+(Never mind that this should be 7:30am in Mumbai, yet for some reason the show
+proceeds as though it's also mid-evening there.)
+</li>
+<li>
+In the "14 Days to Go"/"T Minus..." episode of
+<em>You, Me and the Apocalypse</em>
+(first aired 2015-11-11 in the UK, 2016-03-10 in the US),
+the success of a mission to deal with a comet
+hinges on whether or not Russia observes daylight saving time.
+(In the US, the episode first aired in the week before the switch to DST.)
+</li>
+</ul>
+
+<table>
 <tr><td>TV episode title</td><td>The Lost Hour</td>
 <tr><td>TV series</td><td><em>Eerie, Indiana</em></td>
 <tr><td>TV episode number</td><td>10</td>
@@ -281,8 +360,11 @@
 <tr><td>Air date</td><td>2016-01-17</td></tr>
 <tr><td>Notes</td><td>The applicability of a contract hinges on the
 time zone associated with a video time stamp.</td></tr>
-<tr><td>&nbsp;</td></tr>
+</table>
 
+<h2>Books, plays, and magazines</h2>
+
+<table>
 <tr><td>Artist</td><td>Jules Verne</td></tr>
 <tr><td>Book</td><td><em>Around the World in Eighty Days</em>