W3C home > Mailing lists > Public > public-html-commits@w3.org > October 2008

html5/spec Overview.html,1.1552,1.1553

From: Ian Hickson via cvs-syncmail <cvsmail@w3.org>
Date: Thu, 30 Oct 2008 00:21:59 +0000
To: public-html-commits@w3.org
Message-Id: <E1KvLIV-0005Tz-Kq@lionel-hutz.w3.org>

Update of /sources/public/html5/spec
In directory hutz:/tmp/cvs-serv21054

Modified Files:
	Overview.html 
Log Message:
Redefine datetimes to be stricter. Merge the two definitions of timezoned datetimes. (whatwg r2381)

Index: Overview.html
===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.1552
retrieving revision 1.1553
diff -u -d -r1.1552 -r1.1553
--- Overview.html	29 Oct 2008 22:30:22 -0000	1.1552
+++ Overview.html	30 Oct 2008 00:21:56 -0000	1.1553
@@ -8,7 +8,7 @@
    <p><a href=http://www.w3.org/><img alt=W3C height=48 src=http://www.w3.org/Icons/w3c_home width=72></a></p>
    <h1>HTML 5</h1>
    <h2 class="no-num no-toc" id=a-vocabulary-and-associated-apis-for-html-and-xhtml>A vocabulary and associated APIs for HTML and XHTML</h2>
-   <h2 class="no-num no-toc" id=editor-s-draft-date-zzz-9-june-2008><!-- "W3C Working Draft" --> Editor's Draft <!--ZZZ-->29 October 2008</h2>
+   <h2 class="no-num no-toc" id=editor-s-draft-date-zzz-9-june-2008><!-- "W3C Working Draft" --> Editor's Draft <!--ZZZ-->30 October 2008</h2>
    <dl><!-- ZZZ: update the month/day
     <dt>This Version:</dt>
     <dd><a href="http://www.w3.org/TR/2008/WD-html5-20080610/">http://www.w3.org/TR/2008/WD-html5-20080610/</a></dd>
@@ -97,7 +97,7 @@
   specification's progress along the W3C Recommendation
   track.
   <!--ZZZ:-->
-  This specification is the 29 October 2008 <!--ZZZ "Working Draft"-->Editor's Draft.
+  This specification is the 30 October 2008 <!--ZZZ "Working Draft"-->Editor's Draft.
   <!--:ZZZ-->
   </p><!-- UNDER NO CIRCUMSTANCES IS THE PRECEDING PARAGRAPH TO BE REMOVED OR EDITED WITHOUT TALKING TO IAN FIRST --><!-- relationship to other work (required) --><p>This specification is also being produced by the <a href=http://www.whatwg.org/>WHATWG</a>. The two specifications are
   identical from the table of contents onwards.</p><!-- UNDER NO CIRCUMSTANCES IS THE FOLLOWING PARAGRAPH TO BE REMOVED OR EDITED WITHOUT TALKING TO IAN FIRST --><!-- UNDER NO CIRCUMSTANCES IS THE PRECEDING PARAGRAPH TO BE REMOVED OR EDITED WITHOUT TALKING TO IAN FIRST --><!-- context and rationale (required) --><p>This specification is intended to replace (be a new version of)
@@ -164,15 +164,14 @@
        <li><a href=#lists-of-integers><span class=secno>2.4.3.6 </span>Lists of integers</a></ol></li>
      <li><a href=#dates-and-times><span class=secno>2.4.4 </span>Dates and times</a>
       <ol>
-       <li><a href=#specific-moments-in-time><span class=secno>2.4.4.1 </span>Specific moments in time</a></li>
-       <li><a href=#utc-dates-and-times><span class=secno>2.4.4.2 </span>UTC dates and times</a></li>
-       <li><a href=#local-dates-and-times><span class=secno>2.4.4.3 </span>Local dates and times</a></li>
-       <li><a href=#dates><span class=secno>2.4.4.4 </span>Dates</a></li>
-       <li><a href=#months><span class=secno>2.4.4.5 </span>Months</a></li>
-       <li><a href=#weeks><span class=secno>2.4.4.6 </span>Weeks</a></li>
-       <li><a href=#times><span class=secno>2.4.4.7 </span>Times</a></li>
-       <li><a href=#vaguer-moments-in-time><span class=secno>2.4.4.8 </span>Vaguer moments in time</a></li>
-       <li><a href=#time-offsets><span class=secno>2.4.4.9 </span>Time offsets</a></ol></li>
+       <li><a href=#global-dates-and-times><span class=secno>2.4.4.1 </span>Global dates and times</a></li>
+       <li><a href=#local-dates-and-times><span class=secno>2.4.4.2 </span>Local dates and times</a></li>
+       <li><a href=#dates><span class=secno>2.4.4.3 </span>Dates</a></li>
+       <li><a href=#months><span class=secno>2.4.4.4 </span>Months</a></li>
+       <li><a href=#weeks><span class=secno>2.4.4.5 </span>Weeks</a></li>
+       <li><a href=#times><span class=secno>2.4.4.6 </span>Times</a></li>
+       <li><a href=#vaguer-moments-in-time><span class=secno>2.4.4.7 </span>Vaguer moments in time</a></li>
+       <li><a href=#time-offsets><span class=secno>2.4.4.8 </span>Time offsets</a></ol></li>
      <li><a href=#space-separated-tokens><span class=secno>2.4.5 </span>Space-separated tokens</a></li>
      <li><a href=#comma-separated-tokens><span class=secno>2.4.6 </span>Comma-separated tokens</a></li>
      <li><a href=#keywords-and-enumerated-attributes><span class=secno>2.4.7 </span>Keywords and enumerated attributes</a></li>
@@ -2231,41 +2230,107 @@
   12; <em>30</em> if <var title="">month</var> is 4, 6, 9, or 11;
   <em>29</em> if <var title="">month</var> is 2 and <var title="">year</var> is a number divisible by 400, or if <var title="">year</var> is a number divisible by 4 but not by 100; and
   <em>28</em> otherwise. This takes into account leap years in the
-  Gregorian calendar. <a href=#references>[GREGORIAN]</a><h5 id=specific-moments-in-time><span class=secno>2.4.4.1 </span>Specific moments in time</h5><p class=XXX>This syntax is going to be tightened up and
-  made almost exactly the same as the <a href=#valid-utc-date-and-time-string>valid UTC date and time
-  string</a> syntax, with the exception of allowing time zones. In
-  fact what we might do is allow time zones in general, use the same
-  parser, etc, but require that UAs always use the UTC time zone when
-  synthesizing datetimes for form submission.<p>A string is a <dfn id=valid-datetime>valid datetime</dfn> if it has four digits
-  (representing the year), a literal hyphen, two digits (representing
-  the month), a literal hyphen, two digits (representing the day),
-  optionally some spaces, either a literal T or a space, optionally
-  some more spaces, two digits (for the hour), a colon, two digits
-  (the minutes), optionally the seconds (which, if included, must
-  consist of another colon, two digits (the integer part of the
-  seconds), and optionally a decimal point followed by one or more
-  digits (for the fractional part of the seconds)), optionally some
-  spaces, and finally either a literal Z (indicating the time zone is
-  UTC), or, a plus sign or a minus sign followed by two digits, a
-  colon, and two digits (for the sign, the hours and minutes of the
-  timezone offset respectively); with the month-day combination being
-  a valid date in the given year according to the Gregorian calendar,
-  the hour values (<var title="">h</var>) being in the range
-  0&nbsp;&le;&nbsp;<var title="">h</var>&nbsp;&le;&nbsp;23, the minute
-  values (<var title="">m</var>) in the range 0&nbsp;&le;&nbsp;<var title="">m</var>&nbsp;&le;&nbsp;59, and the second value (<var title="">s</var>) being in the range 0&nbsp;&le;&nbsp;<var title="">h</var>&nbsp;&lt;&nbsp;60. <a href=#references>[GREGORIAN]</a></p><!--XXX [GREGORIAN] should point to
+  Gregorian calendar. <a href=#references>[GREGORIAN]</a><h5 id=global-dates-and-times><span class=secno>2.4.4.1 </span>Global dates and times</h5><p>A <dfn id=concept-datetime title=concept-datetime>global date and time</dfn>
+  consists of a specific Gregorian date, consisting of a year, a
+  month, a day, an hour, a minute, a second, and a fraction of a
+  second, expressed with a time zone, consisting of a number of hours
+  and minutes. <a href=#references>[GREGORIAN]</a></p><!--XXX [GREGORIAN] should point to
   <dd id="refsGREGORIAN">[GREGORIAN]</dd>
   <dd>(Non-normative) <cite>Inter Gravissimas</cite>, A. Lilius, C. Clavius. Gregory XIII Papal Bulls, February 1582.</dd>
-  --><p>The digits must be characters in the range U+0030 DIGIT ZERO (0)
-  to U+0039 DIGIT NINE (9), the hyphens must be a U+002D HYPHEN-MINUS
-  characters, the T must be a U+0054 LATIN CAPITAL LETTER T, the
-  colons must be U+003A COLON characters, the decimal point must be a
-  U+002E FULL STOP, the Z must be a U+005A LATIN CAPITAL LETTER Z, the
-  plus sign must be a U+002B PLUS SIGN, and the minus U+002D (same as
-  the hyphen).<div class=example>
+  --><p>A string is a <dfn id=valid-global-date-and-time-string>valid global date and time string</dfn> if it
+  has the components in the following list, in the given order, and if
+  the components in the list follow the constraints given after the
+  list:<ol><li>Four or more digits (representing the year)</li>
 
-   <p>The following are some examples of dates written as <a href=#valid-datetime title="valid datetime">valid datetimes</a>.</p>
+   <li>A U+002D HYPHEN-MINUS character (-).</li>
 
-   <dl><dt>"<code>0037-12-13 00:00 Z</code>"</dt>
+   <li>Two digits (representing the month)</li>
+
+   <li>A U+002D HYPHEN-MINUS character (-).</li>
+
+   <li>Two digits (representing the day)</li>
+
+   <li>A U+0054 LATIN CAPITAL LETTER T character.</li>
+
+   <li>Two digits (representing the hour)</li>
+
+   <li>A U+003A COLON character (:).</li>
+
+   <li>Two digits (representing the minutes)</li>
+
+   <li>Optionally:
+
+    <ol><li>A U+003A COLON character (:).</li>
+
+     <li>Two digits (representing the integer part of the seconds)</li>
+
+     <li>Optionally:
+
+      <ol><li>A 002E FULL STOP character (.)</li>
+
+       <li>One or more digits (representing the fractional part of the seconds)</li>
+
+      </ol></li>
+
+    </ol></li>
+
+   <li>Either:
+
+    <ul><li>A U+005A LATIN CAPITAL LETTER Z character (indicating the
+     time zone is UTC)</li>
+
+     <li>Or:
+
+      <ol><li>Either a U+002B PLUS SIGN character (+) or a U+002D
+       HYPHEN-MINUS (-) character (the sign of the timezone
+       offset)</li>
+
+       <li>Two digits (representing the hours component of the timezone offset)</li>
+
+       <li>A U+003A COLON character (:).</li>
+
+       <li>Two digits (representing the minutes component of the timezone offset)</li>
+
+      </ol></li>
+
+    </ul></li>
+
+  </ol><p>The aforementioned constraints are:<ul><li>The month <var title="">m</var> must be in the range
+   0&nbsp;&le;&nbsp;<var title="">m</var>&nbsp;&le;&nbsp;12.</li>
+
+   <li>The day <var title="">d</var> must be in the range
+   0&nbsp;&le;&nbsp;<var title="">d</var>&nbsp;&le;&nbsp;<var title="">D</var> where <var title="">D</var> is the <a href=#number-of-days-in-month-month-of-year-year title="number of days in month month of year year">number of days
+   in the given month and year</a>.</li>
+
+   <li>The hour <var title="">h</var> must be in the range
+   0&nbsp;&le;&nbsp;<var title="">h</var>&nbsp;&le;&nbsp;23.</li>
+
+   <li>The minute <var title="">m</var> must be in the range
+   0&nbsp;&le;&nbsp;<var title="">m</var>&nbsp;&le;&nbsp;59.</li>
+
+   <li>If present, the second <var title="">s</var> (consisting of the
+   integer part and its fractional part) must be in the range
+   0&nbsp;&le;&nbsp;<var title="">s</var>&nbsp;&lt;&nbsp;60.  (The
+   values 60 and 61 are not allowed: leap seconds cannot be
+   represented by datetime values.)</li>
+
+   <li>If present, the time zone hour <var title="">h</var> must be in
+   the range 0&nbsp;&le;&nbsp;<var title="">h</var>&nbsp;&le;&nbsp;23. (However, in practice, time
+   zones do not currently ever have an hour component greater than
+   14.)</li>
+
+   <li>If present, the time zone minute <var title="">m</var> must be
+   in the range 0&nbsp;&le;&nbsp;<var title="">m</var>&nbsp;&le;&nbsp;59. (However, in practice, time
+   zones do not currently ever have a minute component other than 0, 30,
+   or 45.)</li>
+
+  </ul><p>The digits must be characters in the range U+0030 DIGIT ZERO to
+  U+0039 DIGIT NINE, used to express numbers in base ten.<div class=example>
+
+   <p>The following are some examples of dates written as <a href=#valid-global-date-and-time-string title="valid global date and time string">valid global date and
+   time strings</a>.</p>
+
+   <dl><dt>"<code>0037-12-13T00:00Z</code>"</dt>
 
     <dd>Midnight UTC on the birthday of Nero (the Roman Emperor).</dd>
 
@@ -2275,11 +2340,12 @@
     zone in use on the east coast of North America during daylight
     saving time.</dd>
 
-    <dt>"<code>8592-01-01 T 02:09 +02:09</code>"</dt>
+    <dt>"<code>8592-01-01T02:09+02:09</code>"</dt>
 
     <dd>Midnight UTC on the 1st of January, 8592. The time zone
     associated with that time is two hours and nine minutes ahead of
-    UTC.</dd>
+    UTC, which is not a real time zone currently, but is nonetheless
+    allowed.</dd>
 
    </dl><p>Several things are notable about these dates:</p>
 
@@ -2299,19 +2365,16 @@
 
     <li>The time and timezone components are not optional.</li>
 
-    <li>Dates before the year 0 or after the year 9999 can't be
-    represented as a datetime in this version of HTML.</li>
+    <li>Dates before the year zero can't be represented as a datetime
+    in this version of HTML.</li>
 
     <li>Time zones differ based on daylight savings time.</li>
 
-   </ul></div><p class=note>Conformance checkers can use the algorithm below to
-  determine if a datetime is a valid datetime or not.<p>To <dfn id=datetime-parser>parse a string as a datetime
-  value</dfn>, a user agent must apply the following algorithm to the
-  string. This will either return a time in UTC, with associated
+   </ul></div><p>The rules to <dfn id=parse-a-global-date-and-time-string>parse a global date and time string</dfn> are
+  as follows. This will either return a time in UTC, with associated
   timezone information for round tripping or display purposes, or
-  nothing, indicating the value is not a <a href=#valid-datetime>valid
-  datetime</a>. If at any point the algorithm says that it "fails",
-  this means that it returns nothing.<ol><li><p>Let <var title="">input</var> be the string being
+  nothing. If at any point the algorithm says that it "fails", this
+  means that it is aborted at that point and returns nothing.<ol><li><p>Let <var title="">input</var> be the string being
    parsed.</li>
 
    <li><p>Let <var title="">position</var> be a pointer into <var title="">input</var>, initially pointing at the start of the
@@ -2319,9 +2382,9 @@
 
    <li><p><a href=#collect-a-sequence-of-characters>Collect a sequence of characters</a> in the range
    U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected
-   sequence is not exactly four characters long, then fail. Otherwise,
-   interpret the resulting sequence as a base-ten integer. Let that
-   number be the <var title="">year</var>.</li>
+   sequence is not at least four characters long, then
+   fail. Otherwise, interpret the resulting sequence as a base-ten
+   integer. Let that number be the <var title="">year</var>.</li>
 
    <li><p>If <var title="">position</var> is beyond the end of <var title="">input</var> or if the character at <var title="">position</var> is not a U+002D HYPHEN-MINUS character,
    then fail. Otherwise, move <var title="">position</var> forwards
@@ -2334,7 +2397,8 @@
    number be the <var title="">month</var>.</li>
 
    <li>If <var title="">month</var> is not a number in the range
-   1&nbsp;&le;&nbsp;<var title="">month</var>&nbsp;&le;&nbsp;12, then fail.</li>
+   1&nbsp;&le;&nbsp;<var title="">month</var>&nbsp;&le;&nbsp;12, then
+   fail.</li>
 
    <li><p>Let <var title="">maxday</var> be the <a href=#number-of-days-in-month-month-of-year-year>number of days
    in month <var title="">month</var> of year <var title="">year</var></a>.</li>
@@ -2352,10 +2416,9 @@
    <li><p>If <var title="">day</var> is not a number in the range
    1&nbsp;&le;&nbsp;<var title="">month</var>&nbsp;&le;&nbsp;<var title="">maxday</var>, then fail.</li>
 
-   <li><p><a href=#collect-a-sequence-of-characters>Collect a sequence of characters</a> that are
-   either U+0054 LATIN CAPITAL LETTER T characters or <a href=#space-character title="space character">space characters</a>. If the collected
-   sequence is zero characters long, or if it contains more than one
-   U+0054 LATIN CAPITAL LETTER T character, then fail.</li>
+   <li><p>If <var title="">position</var> is beyond the end of <var title="">input</var> or if the character at <var title="">position</var> is not a U+0054 LATIN CAPITAL LETTER T
+   character then fail. Otherwise, move <var title="">position</var>
+   forwards one character.</li>
 
    <li><p><a href=#collect-a-sequence-of-characters>Collect a sequence of characters</a> in the range
    U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected
@@ -2364,11 +2427,12 @@
    number be the <var title="">hour</var>.</li>
 
    <li>If <var title="">hour</var> is not a number in the range
-   0&nbsp;&le;&nbsp;<var title="">hour</var>&nbsp;&le;&nbsp;23, then fail.</li>
+   0&nbsp;&le;&nbsp;<var title="">hour</var>&nbsp;&le;&nbsp;23, then
+   fail.</li>
 
-   <li><p>If <var title="">position</var> is beyond the end of <var title="">input</var> or if the character at <var title="">position</var> is not a U+003A COLON character,
-   then fail. Otherwise, move <var title="">position</var> forwards
-   one character.</li>
+   <li><p>If <var title="">position</var> is beyond the end of <var title="">input</var> or if the character at <var title="">position</var> is not a U+003A COLON character, then
+   fail. Otherwise, move <var title="">position</var> forwards one
+   character.</li>
 
    <li><p><a href=#collect-a-sequence-of-characters>Collect a sequence of characters</a> in the range
    U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). If the collected
@@ -2377,15 +2441,18 @@
    number be the <var title="">minute</var>.</li>
 
    <li>If <var title="">minute</var> is not a number in the range
-   0&nbsp;&le;&nbsp;<var title="">minute</var>&nbsp;&le;&nbsp;59, then fail.</li>
+   0&nbsp;&le;&nbsp;<var title="">minute</var>&nbsp;&le;&nbsp;59, then
+   fail.</li>
 
    <li><p>Let <var title="">second</var> be a string with the value
    "0".</li>
 
    <li><p>If <var title="">position</var> is beyond the end of <var title="">input</var>, then fail.</li>
 
-   <li><p>If the character at <var title="">position</var> is a U+003A
-   COLON, then:</p>
+   <li>
+
+    <p>If the character at <var title="">position</var> is a U+003A
+    COLON, then run these substeps:</p>
 
     <ol><li><p>Advance <var title="">position</var> to the next character
      in <var title="">input</var>.</li>
@@ -2405,34 +2472,31 @@
     </ol></li>
 
    <li><p>Interpret <var title="">second</var> as a base-ten number
-   (possibly with a fractional part). Let that number be <var title="">second</var> instead of the string version.</li>
+   (possibly with a fractional part). Let <var title="">second</var>
+   be that number instead of the string version.</li>
 
    <li>If <var title="">second</var> is not a number in the range
    0&nbsp;&le;&nbsp;<var title="">second</var>&nbsp;&lt;&nbsp;60, then
-   fail. (The values 60 and 61 are not allowed: leap seconds cannot be
-   represented by datetime values.)</li>
+   fail.</li>
 
    <li><p>If <var title="">position</var> is beyond the end of <var title="">input</var>, then fail.</li>
 
-   <li><p><a href=#skip-whitespace>Skip whitespace</a>.</li>
+   <li>
 
-   <li><p>If the character at <var title="">position</var> is a
-   U+005A LATIN CAPITAL LETTER Z, then:</p>
+    <p>If the character at <var title="">position</var> is a U+005A
+    LATIN CAPITAL LETTER Z, then:</p>
 
-    <ol><li><p>Let <var title="">timezone<sub title="">hours</sub></var> be
-     0.</li>
+    <ol><li><p>Let <var title="">timezone<sub title="">hours</sub></var>
+     be 0.</li>
 
-     <li><p>Let <var title="">timezone<sub title="">minutes</sub></var> be
-     0.</li>
+     <li><p>Let <var title="">timezone<sub title="">minutes</sub></var> be 0.</li>
 
      <li><p>Advance <var title="">position</var> to the next character
      in <var title="">input</var>.</li>
 
-    </ol></li>
-
-   <li><p>Otherwise, if the character at <var title="">position</var>
-   is either a U+002B PLUS SIGN ("+") or a U+002D HYPHEN-MINUS ("-"),
-   then:</p>
+    </ol><p>Otherwise, if the character at <var title="">position</var> is
+    either a U+002B PLUS SIGN ("+") or a U+002D HYPHEN-MINUS ("-"),
+    then:</p>
 
     <ol><li><p>If the character at <var title="">position</var> is a
      U+002B PLUS SIGN ("+"), let <var title="">sign</var> be
@@ -2447,9 +2511,8 @@
      fail. Otherwise, interpret the resulting sequence as a base-ten
      integer. Let that number be the <var title="">timezone<sub title="">hours</sub></var>.</li>
 
-     <li>If <var title="">timezone<sub title="">hours</sub></var> is not a
-     number in the range 0&nbsp;&le;&nbsp;<var title="">timezone<sub title="">hours</sub></var>&nbsp;&le;&nbsp;23, then
-     fail.</li>
+     <li>If <var title="">timezone<sub title="">hours</sub></var> is
+     not a number in the range 0&nbsp;&le;&nbsp;<var title="">timezone<sub title="">hours</sub></var>&nbsp;&le;&nbsp;23, then fail.</li>
 
      <li>If <var title="">sign</var> is "negative", then negate <var title="">timezone<sub title="">hours</sub></var>.</li>
 
@@ -2463,9 +2526,8 @@
      fail. Otherwise, interpret the resulting sequence as a base-ten
      integer. Let that number be the <var title="">timezone<sub title="">minutes</sub></var>.</li>
 
-     <li>If <var title="">timezone<sub title="">minutes</sub></var> is not a
-     number in the range 0&nbsp;&le;&nbsp;<var title="">timezone<sub title="">minutes</sub></var>&nbsp;&le;&nbsp;59, then
-     fail.</li>
+     <li>If <var title="">timezone<sub title="">minutes</sub></var> is
+     not a number in the range 0&nbsp;&le;&nbsp;<var title="">timezone<sub title="">minutes</sub></var>&nbsp;&le;&nbsp;59, then fail.</li>
 
      <li>If <var title="">sign</var> is "negative", then negate <var title="">timezone<sub title="">minutes</sub></var>.</li>
 
@@ -2486,23 +2548,19 @@
 
    <li><p>Return <var title="">time</var> and <var title="">timezone</var>.</li>
 
-  </ol><h5 id=utc-dates-and-times><span class=secno>2.4.4.2 </span>UTC dates and times</h5><p>A <dfn id=concept-datetime title=concept-datetime>UTC date and time</dfn> consists
-  of a specific Gregorian date expressed relative to the UTC timezone,
-  consisting of a year, a month, a day, an hour, a minute, a second,
-  and a fraction of a second. <a href=#references>[GREGORIAN]</a><p class=XXX>... <dfn id=valid-utc-date-and-time-string>valid UTC date and time string</dfn><p class=XXX>... rules to <dfn id=parse-a-utc-date-and-time-string>parse a UTC date and time
-  string</dfn><h5 id=local-dates-and-times><span class=secno>2.4.4.3 </span>Local dates and times</h5><p>A <dfn id=concept-datetime-local title=concept-datetime-local>local date and time</dfn>
+  </ol><h5 id=local-dates-and-times><span class=secno>2.4.4.2 </span>Local dates and times</h5><p>A <dfn id=concept-datetime-local title=concept-datetime-local>local date and time</dfn>
   consists of a specific Gregorian date with no timezone information,
   consisting of a year, a month, a day, an hour, a minute, a second,
   and a fraction of a second. <a href=#references>[GREGORIAN]</a><p class=XXX>... <dfn id=valid-local-date-and-time-string>valid local date and time string</dfn><p class=XXX>... rules to <dfn id=parse-a-local-date-and-time-string>parse a local date and time
-  string</dfn><h5 id=dates><span class=secno>2.4.4.4 </span>Dates</h5><p>A <dfn id=concept-date title=concept-date>date</dfn> consists of a specific
+  string</dfn><h5 id=dates><span class=secno>2.4.4.3 </span>Dates</h5><p>A <dfn id=concept-date title=concept-date>date</dfn> consists of a specific
   Gregorian date with no timezone information, consisting of a year, a
-  month, and a day. <a href=#references>[GREGORIAN]</a><p class=XXX>... <dfn id=valid-date-string>valid date string</dfn><p class=XXX>... rules to <dfn id=parse-a-date-string>parse a date string</dfn><h5 id=months><span class=secno>2.4.4.5 </span>Months</h5><p>A <dfn id=concept-month title=concept-month>month</dfn> consists of a specific
+  month, and a day. <a href=#references>[GREGORIAN]</a><p class=XXX>... <dfn id=valid-date-string>valid date string</dfn><p class=XXX>... rules to <dfn id=parse-a-date-string>parse a date string</dfn><h5 id=months><span class=secno>2.4.4.4 </span>Months</h5><p>A <dfn id=concept-month title=concept-month>month</dfn> consists of a specific
   Gregorian date with no timezone information and no date information
-  beyond a year and a month. <a href=#references>[GREGORIAN]</a><p class=XXX>... <dfn id=valid-month-string>valid month string</dfn><p class=XXX>... rules to <dfn id=parse-a-month-string>parse a month string</dfn><h5 id=weeks><span class=secno>2.4.4.6 </span>Weeks</h5><p>A <dfn id=concept-week title=concept-week>week</dfn> consists of a specific
+  beyond a year and a month. <a href=#references>[GREGORIAN]</a><p class=XXX>... <dfn id=valid-month-string>valid month string</dfn><p class=XXX>... rules to <dfn id=parse-a-month-string>parse a month string</dfn><h5 id=weeks><span class=secno>2.4.4.5 </span>Weeks</h5><p>A <dfn id=concept-week title=concept-week>week</dfn> consists of a specific
   Gregorian date with no timezone information and no date information
-  beyond a year and a week. <a href=#references>[GREGORIAN]</a></p><!-- XXX ISO week information --><p class=XXX>... <dfn id=valid-week-string>valid week string</dfn><p class=XXX>... rules to <dfn id=parse-a-week-string>parse a week string</dfn><h5 id=times><span class=secno>2.4.4.7 </span>Times</h5><p>A <dfn id=concept-time title=concept-time>time</dfn> consists of a specific
+  beyond a year and a week. <a href=#references>[GREGORIAN]</a></p><!-- XXX ISO week information --><p class=XXX>... <dfn id=valid-week-string>valid week string</dfn><p class=XXX>... rules to <dfn id=parse-a-week-string>parse a week string</dfn><h5 id=times><span class=secno>2.4.4.6 </span>Times</h5><p>A <dfn id=concept-time title=concept-time>time</dfn> consists of a specific
   time with no timezone information, consisting of an hour, a minute,
-  a second, and a fraction of a second.<p class=XXX>... <dfn id=valid-time-string>valid time string</dfn><p class=XXX>... rules to <dfn id=parse-a-time-string>parse a time string</dfn><h5 id=vaguer-moments-in-time><span class=secno>2.4.4.8 </span>Vaguer moments in time</h5><p>This section defines <dfn id=date-or-time-string title="date or time string">date or
+  a second, and a fraction of a second.<p class=XXX>... <dfn id=valid-time-string>valid time string</dfn><p class=XXX>... rules to <dfn id=parse-a-time-string>parse a time string</dfn><h5 id=vaguer-moments-in-time><span class=secno>2.4.4.7 </span>Vaguer moments in time</h5><p>This section defines <dfn id=date-or-time-string title="date or time string">date or
   time strings</dfn>. There are two kinds, <dfn id=date-or-time-string-in-content title="date or time
   string in content">date or time strings in content</dfn>, and <dfn id=date-or-time-string-in-attributes title="date or time string in attributes">date or time strings in
   attributes</dfn>. The only difference is in the handling of
@@ -2786,7 +2844,7 @@
 
    <li><p>Abort these steps (the string is parsed).</li>
 
-  </ol><h5 id=time-offsets><span class=secno>2.4.4.9 </span>Time offsets</h5><p class=XXX><dfn id=valid-time-offset>valid time offset</dfn>, <dfn id=rules-for-parsing-time-offsets>rules for
+  </ol><h5 id=time-offsets><span class=secno>2.4.4.8 </span>Time offsets</h5><p class=XXX><dfn id=valid-time-offset>valid time offset</dfn>, <dfn id=rules-for-parsing-time-offsets>rules for
   parsing time offsets</dfn>, <dfn id=time-offset-serialization-rules>time offset serialization
   rules</dfn>; probably in the format "5d4h3m2.1s" or similar, with
   all components being optional, and the last component's unit suffix
@@ -11062,14 +11120,15 @@
   change. User agents should allow users to follow such citation
   links.<p>The <dfn id=attr-mod-datetime title=attr-mod-datetime><code>datetime</code></dfn>
   attribute may be used to specify the time and date of the change.<p>If present, the <code title=attr-mod-datetime><a href=#attr-mod-datetime>datetime</a></code>
-  attribute must be a <a href=#valid-datetime>valid datetime</a> value.<p>User agents must parse the <code title=attr-mod-datetime><a href=#attr-mod-datetime>datetime</a></code> attribute according to the
-  <a href=#datetime-parser>parse a string as a datetime value</a> algorithm. If that
+  attribute must be a <a href=#valid-global-date-and-time-string>valid global date and time string</a>
+  value.<p>User agents must parse the <code title=attr-mod-datetime><a href=#attr-mod-datetime>datetime</a></code> attribute according to the
+  <a href=#parse-a-global-date-and-time-string>parse a global date and time string</a> algorithm. If that
   doesn't return a time, then the modification has no associated
-  timestamp (the value is non-conforming; it is not a <a href=#valid-datetime>valid
-  datetime</a>). Otherwise, the modification is marked as having
-  been made at the given datetime. User agents should use the
-  associated timezone information to determine which timezone to
-  present the given datetime in.<p>The <code><a href=#the-ins-element>ins</a></code> and <code><a href=#the-del-element>del</a></code> elements must implement
+  timestamp (the value is non-conforming; it is not a <a href=#valid-global-date-and-time-string>valid
+  global date and time string</a>). Otherwise, the modification is
+  marked as having been made at the given datetime. User agents should
+  use the associated timezone information to determine which timezone
+  to present the given datetime in.<p>The <code><a href=#the-ins-element>ins</a></code> and <code><a href=#the-del-element>del</a></code> elements must implement
   the <code><a href=#htmlmodelement>HTMLModElement</a></code> interface:<pre class=idl>interface <dfn id=htmlmodelement>HTMLModElement</dfn> : <a href=#htmlelement>HTMLElement</a> {
            attribute DOMString <a href=#dom-mod-cite title=dom-mod-cite>cite</a>;
            attribute DOMString <a href=#dom-mod-datetime title=dom-mod-datetime>dateTime</a>;
@@ -19796,54 +19855,61 @@
   </div><h6 id=date-and-time-state><span class=secno>4.10.4.1.6 </span><dfn title=attr-input-type-datetime>Date and Time</dfn> state</h6><p>When an <code><a href=#the-input-element>input</a></code> element's <code title=attr-input-type><a href=#attr-input-type>type</a></code> attribute is in the <a href=#date-and-time-state title=attr-input-type-datetime>Date and Time</a> state, the
   rules in this section apply.<p>The <code><a href=#the-input-element>input</a></code> element represents a control for setting
   the element's <a href=#concept-fe-value title=concept-fe-value>value</a> to a
-  string representing a specific <a href=#concept-datetime title=concept-datetime>UTC
+  string representing a specific <a href=#concept-datetime title=concept-datetime>global
   date and time</a>. User agents may display the date and time in
   whatever timezone is appropriate for the user.<p>If the element is <i title=concept-input-mutable><a href=#concept-input-mutable>mutable</a></i>,
-  the user agent should allow the user to change the <a href=#concept-datetime title=concept-datetime>UTC date and time</a> represented by its
-  <a href=#concept-fe-value title=concept-fe-value>value</a>, as obtained by <a href=#parse-a-utc-date-and-time-string title="parse a UTC date and time string">parsing a UTC date and
-  time</a> from it. User agents must not allow the user to set the
-  <a href=#concept-fe-value title=concept-fe-value>value</a> to a string that is not
-  a <a href=#valid-utc-date-and-time-string>valid UTC date and time string</a>. If the user agent
-  provides a user interface for selecting a <a href=#concept-datetime title=concept-datetime>UTC date and time</a>, then the <a href=#concept-fe-value title=concept-fe-value>value</a> must be set to a <a href=#valid-utc-date-and-time-string>valid
-  UTC date and time string</a> representing the user's
-  selection. User agents should allow the user to set the <a href=#concept-fe-value title=concept-fe-value>value</a> to the empty string.<p>The <code title=attr-input-value><a href=#attr-input-value>value</a></code> attribute, if
-  specified, must have a value that is a <a href=#valid-utc-date-and-time-string>valid UTC date and time
-  string</a>.</p><!-- ok to set out-of-range value, we never know
-  when we might have to represent bogus input --><p><strong>The <a href=#value-sanitization-algorithm>value sanitization algorithm</a> is as
+  the user agent should allow the user to change the <a href=#concept-datetime title=concept-datetime>global date and time</a> represented by
+  its <a href=#concept-fe-value title=concept-fe-value>value</a>, as obtained by
+  <a href=#parse-a-global-date-and-time-string title="parse a global date and time string">parsing a global
+  date and time</a> from it. User agents must not allow the user to
+  set the <a href=#concept-fe-value title=concept-fe-value>value</a> to a string that
+  is not a <a href=#valid-global-date-and-time-string>valid global date and time string</a> expressed in
+  UTC, though user agents may allow the user to set and view the time
+  in another timezone and silently translate the time to and from the
+  UTC timezone in the <a href=#concept-fe-value title=concept-fe-value>value</a>. If
+  the user agent provides a user interface for selecting a <a href=#concept-datetime title=concept-datetime>global date and time</a>, then the <a href=#concept-fe-value title=concept-fe-value>value</a> must be set to a <a href=#valid-global-date-and-time-string>valid
+  global date and time string</a> expressed in UTC representing the
+  user's selection. User agents should allow the user to set the <a href=#concept-fe-value title=concept-fe-value>value</a> to the empty string.<p>The <code title=attr-input-value><a href=#attr-input-value>value</a></code> attribute, if
+  specified, must have a value that is a <a href=#valid-global-date-and-time-string>valid global date and
+  time string</a>.</p><!-- ok to set out-of-range value, we never
+  know when we might have to represent bogus input --><p><strong>The <a href=#value-sanitization-algorithm>value sanitization algorithm</a> is as
   follows:</strong> If the <a href=#concept-fe-value title=concept-fe-value>value</a>
-  of the element is not a <a href=#valid-utc-date-and-time-string>valid UTC date and time string</a>,
-  then set it to the empty string instead.<p>The <code title=attr-input-min><a href=#attr-input-min>min</a></code> attribute, if
-  specified, must have a value that is a <a href=#valid-utc-date-and-time-string>valid UTC date and time
-  string</a>. The <code title=attr-input-max><a href=#attr-input-max>max</a></code>
-  attribute, if specified, must have a value that is a <a href=#valid-utc-date-and-time-string>valid UTC
-  date and time string</a>.<p>The <code title=attr-input-step><a href=#attr-input-step>step</a></code> attribute is
+  of the element is a <a href=#valid-global-date-and-time-string>valid global date and time string</a>,
+  then adjust the time so that the <a href=#concept-fe-value title=concept-fe-value>value</a> represents the same point in
+  time but expressed in the UTC timezone, otherwise, set it to the
+  empty string instead.<p>The <code title=attr-input-min><a href=#attr-input-min>min</a></code> attribute, if
+  specified, must have a value that is a <a href=#valid-global-date-and-time-string>valid global date and
+  time string</a>. The <code title=attr-input-max><a href=#attr-input-max>max</a></code>
+  attribute, if specified, must have a value that is a <a href=#valid-global-date-and-time-string>valid
+  global date and time string</a>.<p>The <code title=attr-input-step><a href=#attr-input-step>step</a></code> attribute is
   expressed in seconds. The <a href=#concept-input-step-scale title=concept-input-step-scale>step scale factor</a> is 1000
   (which converts the seconds to milliseconds, as used in the other
   algorithms). The <a href=#concept-input-step-default title=concept-input-step-default>default
   step</a> is 60 seconds.<p>When the element is <a href=#suffering-from-a-step-mismatch>suffering from a step mismatch</a>,
-  the user agent may round the element's <a href=#concept-fe-value title=concept-fe-value>value</a> to the nearest <a href=#concept-datetime title=concept-datetime>UTC date and time</a> for which the
+  the user agent may round the element's <a href=#concept-fe-value title=concept-fe-value>value</a> to the nearest <a href=#concept-datetime title=concept-datetime>global date and time</a> for which the
   element would not <a href=#suffering-from-a-step-mismatch title="suffering from a step
   mismatch">suffer from a step mismatch</a>.<p><strong>The <a href=#concept-input-value-string-number title=concept-input-value-string-number>algorithm to convert a
   string to a number</a>, given a string <var title="">input</var>,
-  is as follows:</strong> If <a href=#parse-a-utc-date-and-time-string title="parse a UTC date and time
-  string">parsing a UTC date and time</a> from <var title="">input</var> results in an error, then return an error;
+  is as follows:</strong> If <a href=#parse-a-global-date-and-time-string title="parse a global date and time
+  string">parsing a global date and time</a> from <var title="">input</var> results in an error, then return an error;
   otherwise, return the number of milliseconds elapsed from midnight
   UTC on the morning of 1970-01-01 (the time represented by the value
-  "<code title="">1970-01-01T00:00:00.0Z</code>") to the parsed <a href=#concept-datetime title=concept-datetime>UTC date and time</a>, ignoring leap
+  "<code title="">1970-01-01T00:00:00.0Z</code>") to the parsed <a href=#concept-datetime title=concept-datetime>global date and time</a>, ignoring leap
   seconds.<p><strong>The <a href=#concept-input-value-number-string title=concept-input-value-number-string>algorithm to convert a
   number to a string</a>, given a number <var title="">input</var>,
-  is as follows:</strong> Return a <a href=#valid-utc-date-and-time-string>valid UTC date and time
-  string</a> that represents the <a href=#concept-datetime title=concept-datetime>date and time in UTC</a> that is <var title="">input</var> milliseconds after midnight UTC on the morning
+  is as follows:</strong> Return a <a href=#valid-global-date-and-time-string>valid global date and time
+  string</a> expressed in UTC that represents the <a href=#concept-datetime title=concept-datetime>global date and time</a> that is <var title="">input</var> milliseconds after midnight UTC on the morning
   of 1970-01-01 (the time represented by the value "<code title="">1970-01-01T00:00:00.0Z</code>").<p><strong>The <a href=#concept-input-value-string-date title=concept-input-value-string-date>algorithm to convert a
-  string to a <code>Date</code> object</a>, given a string <var title="">input</var>, is as follows:</strong> If <a href=#parse-a-utc-date-and-time-string title="parse
-  a UTC date and time string">parsing a UTC date and time</a> from
-  <var title="">input</var> results in an error, then return an error;
-  otherwise, return a <code>Date</code> object representing the parsed
-  <a href=#concept-datetime title=concept-datetime>UTC date and time</a>.<p><strong>The <a href=#concept-input-value-date-string title=concept-input-value-date-string>algorithm to convert a
+  string to a <code>Date</code> object</a>, given a string <var title="">input</var>, is as follows:</strong> If <a href=#parse-a-global-date-and-time-string title="parse
+  a global date and time string">parsing a global date and time</a>
+  from <var title="">input</var> results in an error, then return an
+  error; otherwise, return a <code>Date</code> object representing the
+  parsed <a href=#concept-datetime title=concept-datetime>global date and time</a>,
+  expressed in UTC.<p><strong>The <a href=#concept-input-value-date-string title=concept-input-value-date-string>algorithm to convert a
   <code>Date</code> object to a string</a>, given a
   <code>Date</code> object <var title="">input</var>, is as
-  follows:</strong> Return a <a href=#valid-utc-date-and-time-string>valid UTC date and time
-  string</a> that represents the <a href=#concept-datetime title=concept-datetime>date and time in UTC</a> that is
+  follows:</strong> Return a <a href=#valid-global-date-and-time-string>valid global date and time
+  string</a> expressed in UTC that represents the <a href=#concept-datetime title=concept-datetime>global date and time</a> that is
   represented by <var title="">input</var>.<div class=bookkeeping>
 
    <p>The following common <code><a href=#the-input-element>input</a></code> element content
Received on Thursday, 30 October 2008 00:22:09 GMT

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