Squashed 'tz/' changes from b61a7acb4..82693eb52

0fc8f915a Release 2022d
43d32e3a6 tzselect.ksh: mention nawk (the one true awk)
2d49828e3 * asia: Add Palestine URL (thanks to Heba Hamad).
1a0e30a84 Tweak expression of Palestine transition
b6e732290 Fix NEWS typo in previous change
c42d108da Palestine transitions are now Saturdays at 02:00
92e33b2fb backzone: Uzhhorod comment fix (thanks to Garrett Wollman)
d25f00b73 * europe: Comment fix (thanks to Philip Paeps).
2ea205765 Fix commentary in previous change
4dffd914c Simplify three Ukraine zones to one
54e8becfa Additional sourcing for Crimea 2014 switch
a339d366d * southamerica: Add decree (thanks to Eduardo Romero Urra).
aca1a7057 Fix some post-1970 PACKRATLIST glitches
ce4d77644 Release 2022c
747f4a0e1 Spelling/capitalization fixes
4307b3a9d Update some documentation and commentary
aa7019f99 Prefer " to ' in HTML attributes
c9ba895d3 Remove zoneinfo2tdf.pl
e5f99199f Improve tzselect behavior for Turkey etc.
0b9b27e60 Fix bug with 'zic -d /a/b/c' if /a is unwriteable
d7f86ac32 Port .txt generation to macOS
e8171130f Work around macOS awk bug

git-subtree-dir: tz
git-subtree-split: 82693eb525a29a10ec95e9fddf31cb683b124d32

1 files changed, 14 insertions, 12 deletions

diff --git a/theory.html b/theory.html
index 2b14c51..56390ae 100644
--- a/theory.html
+++ b/theory.html
@@ -122,7 +122,7 @@ If geolocation information is available, a selection interface can
 locate the user on a timezone map or prioritize names that are
 geographically close. For an example selection interface, see the
 <code>tzselect</code> program in the <code><abbr>tz</abbr></code> code.
-The <a href="http://cldr.unicode.org">Unicode Common Locale Data
+The <a href="https://cldr.unicode.org">Unicode Common Locale Data
 Repository</a> contains data that may be useful for other selection
 interfaces; it maps timezone names like <code>Europe/Prague</code> to
 locale-dependent strings like "Prague", "Praha", "Прага", and "布拉格".
@@ -571,7 +571,7 @@ in decreasing order of importance:
     locations while uninhabited.
     The leading '<code>-</code>' is a flag that the <abbr>UT</abbr> offset is in
     some sense undefined; this notation is derived
-    from <a href="https://tools.ietf.org/html/rfc3339">Internet
+    from <a href="https://datatracker.ietf.org/doc/html/rfc3339">Internet
     <abbr title="Request For Comments">RFC</abbr> 3339</a>.
   </li>
 </ul>
@@ -624,7 +624,7 @@ Errors in the <code><abbr>tz</abbr></code> database arise from many sources:
     should be observed.
     In her 2015 book
     <cite><a
-    href="http://www.hup.harvard.edu/catalog.php?isbn=9780674286146">The
+    href="https://www.hup.harvard.edu/catalog.php?isbn=9780674286146">The
     Global Transformation of Time, 1870&ndash;1950</a></cite>,
     Vanessa Ogle writes
     "Outside of Europe and North America there was no system of time
@@ -810,7 +810,7 @@ href="https://www.dissentmagazine.org/blog/booked-a-global-history-of-time-vanes
     See: Stephenson FR, Morrison LV, Hohenkerk CY.
     <a href="https://dx.doi.org/10.1098/rspa.2016.0404">Measurement of
     the Earth's rotation: 720 BC to AD 2015</a>.
-    <cite>Proc Royal Soc A</cite>. 2016 Dec 7;472:20160404.
+    <cite>Proc Royal Soc A</cite>. 2016;472:20160404.
     Also see: Espenak F. <a
     href="https://eclipse.gsfc.nasa.gov/SEhelp/uncertainty2004.html">Uncertainty
     in Delta T (ΔT)</a>.
@@ -1036,7 +1036,7 @@ an older <code>zic</code>.
     and numeric data as described <a href="#POSIX">above</a>.
     The file's format is <dfn><abbr>TZif</abbr></dfn>,
     a timezone information format that contains binary data; see
-    <a href="https://tools.ietf.org/html/8536">Internet
+    <a href="https://datatracker.ietf.org/doc/html/8536">Internet
     <abbr>RFC</abbr> 8536</a>.
     The daylight saving time rules to be used for a
     particular timezone are encoded in the
@@ -1064,11 +1064,12 @@ an older <code>zic</code>.
   </li>
   <li>
     The code supports platforms with a <abbr>UT</abbr> offset member
-    in <code>struct tm</code>, e.g., <code>tm_gmtoff</code>.
-  </li>
-  <li>
-    The code supports platforms with a time zone abbreviation member in
-    <code>struct tm</code>, e.g., <code>tm_zone</code>.
+    in <code>struct tm</code>, e.g., <code>tm_gmtoff</code>,
+    or with a time zone abbreviation member in
+    <code>struct tm</code>, e.g., <code>tm_zone</code>. As noted
+    in <a href="https://austingroupbugs.net/view.php?id=1533">Austin
+    Group defect 1533</a>, a future version of POSIX is planned to
+    require <code>tm_gmtoff</code> and <code>tm_zone</code>.
   </li>
   <li>
     Functions <code>tzalloc</code>, <code>tzfree</code>,
@@ -1129,7 +1130,8 @@ The vestigial <abbr>API</abbr>s are:
     <abbr>API</abbr>s.
     Although it can still be used in arguments to
     <code>mktime</code> to disambiguate timestamps near
-    a <abbr>DST</abbr> transition when the clock jumps back, this
+    a <abbr>DST</abbr> transition when the clock jumps back on
+    platforms lacking <code>tm_gmtoff</code>, this
     disambiguation does not work when standard time itself jumps back,
     which can occur when a location changes to a time zone with a
     lesser <abbr>UT</abbr> offset.
@@ -1277,7 +1279,7 @@ the operating system kernel clock as described in
 <a href="tz-link.html#precision">Precision timekeeping</a>,
 and this package by default installs a <samp>leapseconds</samp> file
 commonly used by
-<a href="http://www.ntp.org"><abbr title="Network Time Protocol">NTP</abbr></a>
+<a href="https://www.ntp.org"><abbr title="Network Time Protocol">NTP</abbr></a>
 software that adjusts the kernel clock.
 However, kernel-clock twiddling approximates UTC only roughly,
 and systems needing more-precise UTC can use this package's leap