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spec/Overview.html 1.1555 2383 Define 'month' syntax, and tighten up th

From: poot <cvsmail@w3.org>
Date: Thu, 30 Oct 2008 10:44:02 +0900 (JST)
To: public-html-diffs@w3.org
Message-Id: <20081030014402.D8EFD2BC52@toro.w3.mag.keio.ac.jp>

Define 'month' syntax, and tighten up the rest of the datetime
definitions. (whatwg r2383)

valid date string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#valid-date-string
parse a date component
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#parse-a-date-component
parse a local date and time string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#parse-a-local-date-and-time-string
parse a date string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#parse-a-date-string
valid global date and time string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#valid-global-date-and-time-string
digits
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#concept-datetime-digit
parse a time component
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#parse-a-time-component
2.4.4.4 Local dates and times
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#local-dates-and-times
2.4.4.5 Global dates and times
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#global-dates-and-times
valid time string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#valid-time-string
parse a time string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#parse-a-time-string
2.4.4.6 Weeks
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#weeks
parse a month string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#parse-a-month-string
valid week string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#valid-week-string
parse a month component
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#parse-a-month-component
parse a global date and time string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#parse-a-global-date-and-time-string
valid month string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#valid-month-string
2.4.4.2 Dates
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#dates
2.4.4.1 Months
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#months
2.4.4.3 Times
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#times
valid local date and time string
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#valid-local-date-and-time-string
date or time strings in content
http://people.w3.org/mike/diffs/html5/spec/Overview.1.1555.html#date-or-time-string-in-content

http://people.w3.org/mike/diffs/html5/spec/Overview.diff.html
http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.1554&r2=1.1555&f=h
http://html5.org/tools/web-apps-tracker?from=2382&to=2383

===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.1554
retrieving revision 1.1555
diff -u -d -r1.1554 -r1.1555
--- Overview.html	30 Oct 2008 00:58:16 -0000	1.1554
+++ Overview.html	30 Oct 2008 01:39:29 -0000	1.1555
@@ -164,11 +164,11 @@
        <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=#dates><span class=secno>2.4.4.1 </span>Dates</a></li>
-       <li><a href=#times><span class=secno>2.4.4.2 </span>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=#global-dates-and-times><span class=secno>2.4.4.4 </span>Global dates and times</a></li>
-       <li><a href=#months><span class=secno>2.4.4.5 </span>Months</a></li>
+       <li><a href=#months><span class=secno>2.4.4.1 </span>Months</a></li>
+       <li><a href=#dates><span class=secno>2.4.4.2 </span>Dates</a></li>
+       <li><a href=#times><span class=secno>2.4.4.3 </span>Times</a></li>
+       <li><a href=#local-dates-and-times><span class=secno>2.4.4.4 </span>Local dates and times</a></li>
+       <li><a href=#global-dates-and-times><span class=secno>2.4.4.5 </span>Global dates and times</a></li>
        <li><a href=#weeks><span class=secno>2.4.4.6 </span>Weeks</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>
@@ -2233,48 +2233,37 @@
   Gregorian calendar. <a href=#references>[GREGORIAN]</a><p>The <dfn id=concept-datetime-digit title=concept-datetime-digit>digits</dfn> in the date
   and time syntaxes defined in this section must be characters in the
   range U+0030 DIGIT ZERO to U+0039 DIGIT NINE, used to express
-  numbers in base ten.<h5 id=dates><span class=secno>2.4.4.1 </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>A string is a <dfn id=valid-date-string>valid date 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 <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a> (representing the year)</li>
-
-   <li>A U+002D HYPHEN-MINUS character (-).</li>
-
-   <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a> (representing the month)</li>
-
-   <li>A U+002D HYPHEN-MINUS character (-).</li>
-
-   <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a> (representing the day)</li>
+  numbers in base ten.<h5 id=months><span class=secno>2.4.4.1 </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>A string is a <dfn id=valid-month-string>valid month string</dfn> representing a year
+  <var title="">year</var> and month <var title="">month</var> if it
+  consists of the following components in the given order:<ol><li>Four or more <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a>, representing <var title="">year</var></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>A U+002D HYPHEN-MINUS character (-)</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>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a>,
+   representing the month <var title="">month</var>, in the range
+   0&nbsp;&le;&nbsp;<var title="">month</var>&nbsp;&le;&nbsp;12</li>
 
-  </ul><p>The rules to <dfn id=parse-a-date-string>parse a date string</dfn> are as follows. This
-  will either return a date, or 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
+  </ol><p>The rules to <dfn id=parse-a-month-string>parse a month string</dfn> are as follows. This
+  will either return a year and month, or 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
    string.</li>
 
-   <li><p><a href=#parse-a-date-component>Parse a date component</a> to obtain <var title="">year</var>, <var title="">month</var>, and <var title="">day</var>. If this returns nothing, then fail.</p>
+   <li><p><a href=#parse-a-month-component>Parse a month component</a> to obtain <var title="">year</var> and <var title="">month</var>. If this returns
+   nothing, then fail.</p>
 
    <li><p>If <var title="">position</var> is <em>not</em> beyond the
    end of <var title="">input</var>, then fail.</li>
 
-   <li><p>Let <var title="">date</var> be the date with year <var title="">year</var>, month <var title="">month</var>, and day <var title="">day</var>.</li>
-
-   <li><p>Return <var title="">date</var>.</li>
+   <li><p>Return <var title="">year</var> and <var title="">month</var>.</li>
 
-  </ol><p>The rules to <dfn id=parse-a-date-component>parse a date component</dfn>, given an <var title="">input</var> string and a <var title="">position</var>, are
-  as follows. This will either return a year, a month, and a day, or
+  </ol><p>The rules to <dfn id=parse-a-month-component>parse a month component</dfn>, given an <var title="">input</var> string and a <var title="">position</var>, are
+  as follows. This will either return a year and a month, or
   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><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
@@ -2296,6 +2285,46 @@
    1&nbsp;&le;&nbsp;<var title="">month</var>&nbsp;&le;&nbsp;12, then
    fail.</li>
 
+   <li><p>Return <var title="">year</var> and <var title="">month</var>.</li>
+
+  </ol><h5 id=dates><span class=secno>2.4.4.2 </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>A string is a <dfn id=valid-date-string>valid date string</dfn> representing a year
+  <var title="">year</var>, month <var title="">month</var>, and day
+  <var title="">day</var> if it consists of the following components
+  in the given order:<ol><li>A <a href=#valid-month-string>valid month string</a>, representing <var title="">year</var> and <var title="">month</var></li>
+
+   <li>A U+002D HYPHEN-MINUS character (-)</li>
+
+   <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a>,
+   representing <var title="">day</var>, in the range
+   0&nbsp;&le;&nbsp;<var title="">day</var>&nbsp;&le;&nbsp;<var title="">maxday</var> where <var title="">maxday</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 month <var title="">month</var> and year <var title="">year</var></a></li>
+
+  </ol><p>The rules to <dfn id=parse-a-date-string>parse a date string</dfn> are as follows. This
+  will either return a date, or 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
+   string.</li>
+
+   <li><p><a href=#parse-a-date-component>Parse a date component</a> to obtain <var title="">year</var>, <var title="">month</var>, and <var title="">day</var>. If this returns nothing, then fail.</p>
+
+   <li><p>If <var title="">position</var> is <em>not</em> beyond the
+   end of <var title="">input</var>, then fail.</li>
+
+   <li><p>Let <var title="">date</var> be the date with year <var title="">year</var>, month <var title="">month</var>, and day <var title="">day</var>.</li>
+
+   <li><p>Return <var title="">date</var>.</li>
+
+  </ol><p>The rules to <dfn id=parse-a-date-component>parse a date component</dfn>, given an <var title="">input</var> string and a <var title="">position</var>, are
+  as follows. This will either return a year, a month, and a day, or
+  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><a href=#parse-a-month-component>Parse a month component</a> to obtain <var title="">year</var> and <var title="">month</var>. If this returns
+   nothing, 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>
 
@@ -2315,46 +2344,43 @@
    <li><p>Return <var title="">year</var>, <var title="">month</var>,
    and <var title="">day</var>.</li>
 
-  </ol><h5 id=times><span class=secno>2.4.4.2 </span>Times</h5><p>A <dfn id=concept-time title=concept-time>time</dfn> consists of a specific
+  </ol><h5 id=times><span class=secno>2.4.4.3 </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>A string is a <dfn id=valid-time-string>valid 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>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a> (representing the hour)</li>
+  a second, and a fraction of a second.<p>A string is a <dfn id=valid-time-string>valid time string</dfn> representing an hour
+  <var title="">hour</var>, a minute <var title="">minute</var>, and a
+  second <var title="">second</var> if it consists of the following
+  components in the given order:<ol><li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a>,
+   representing <var title="">hour</var>, in the range
+   0&nbsp;&le;&nbsp;<var title="">hour</var>&nbsp;&le;&nbsp;23</li>
 
-   <li>A U+003A COLON character (:).</li>
+   <li>A U+003A COLON character (:)</li>
 
-   <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a> (representing the minutes)</li>
+   <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a>,
+   representing <var title="">minute</var></li>
 
-   <li>Optionally:
+   <li>Optionally (required if <var title="">second</var> is
+   non-zero):
 
-    <ol><li>A U+003A COLON character (:).</li>
+    <ol><li>A U+003A COLON character (:)</li>
 
-     <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a> (representing the integer part of the seconds)</li>
+     <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a>,
+     representing the integer part of <var title="">second</var>, in
+     the range 0&nbsp;&le;&nbsp;<var title="">s</var>&nbsp;&le;&nbsp;59</li>
 
-     <li>Optionally:
+     <li>Optionally (required if <var title="">second</var> is not an
+     integer):
 
       <ol><li>A 002E FULL STOP character (.)</li>
 
-       <li>One or more <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a> (representing the fractional part of the seconds)</li>
+       <li>One or more <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a>, representing the
+       fractional part of <var title="">second</var></li>
 
       </ol></li>
 
     </ol></li>
 
-  </ol><p>The aforementioned constraints are:<ul><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>
-
-  </ul><p>The rules to <dfn id=parse-a-time-string>parse a time string</dfn> are as follows. This
+  </ol><p class=note>The <var title="">second</var> component cannot be
+  60 or 61; leap seconds cannot be represented.<p>The rules to <dfn id=parse-a-time-string>parse a time string</dfn> are as follows. This
   will either return a time, or 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
@@ -2437,16 +2463,17 @@
    <li><p>Return <var title="">hour</var>, <var title="">minute</var>,
    and <var title="">second</var>.</li>
 
-  </ol><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>2.4.4.4 </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, consisting of a year, a
   month, and a day, and a time, consisting of an hour, a minute, a
   second, and a fraction of a second, but expressed without a time
-  zone. <a href=#references>[GREGORIAN]</a><p>A string is a <dfn id=valid-local-date-and-time-string>valid local date and time string</dfn> if it
-  has the components in the following list, in the given order:<ol><li>A <a href=#valid-date-string>valid date string</a>.</li>
+  zone. <a href=#references>[GREGORIAN]</a><p>A string is a <dfn id=valid-local-date-and-time-string>valid local date and time string</dfn>
+  representing a date and time if it consists of the following
+  components in the given order:<ol><li>A <a href=#valid-date-string>valid date string</a> representing the date.</li>
 
    <li>A U+0054 LATIN CAPITAL LETTER T character.</li>
 
-   <li>A <a href=#valid-time-string>valid time string</a>.</li>
+   <li>A <a href=#valid-time-string>valid time string</a> representing the time.</li>
 
   </ol><p>The rules to <dfn id=parse-a-local-date-and-time-string>parse a local date and time string</dfn> are as
   follows. This will either return a date and time, or nothing. If at
@@ -2475,54 +2502,50 @@
 
    <li><p>Return <var title="">date</var> and <var title="">time</var>.</li>
 
-  </ol><h5 id=global-dates-and-times><span class=secno>2.4.4.4 </span>Global dates and times</h5><p>A <dfn id=concept-datetime title=concept-datetime>global date and time</dfn>
+  </ol><h5 id=global-dates-and-times><span class=secno>2.4.4.5 </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, and a day, and a time, consisting of 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>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>A <a href=#valid-date-string>valid date string</a>.</li>
+  --><p>A string is a <dfn id=valid-global-date-and-time-string>valid global date and time string</dfn>
+  representing a date, time, and a timezone offset if it consists of
+  the following components in the given order:<ol><li>A <a href=#valid-date-string>valid date string</a> representing the date</li>
 
-   <li>A U+0054 LATIN CAPITAL LETTER T character.</li>
+   <li>A U+0054 LATIN CAPITAL LETTER T character</li>
 
-   <li>A <a href=#valid-time-string>valid time string</a>.</li>
+   <li>A <a href=#valid-time-string>valid time string</a> representing the time</li>
 
    <li>Either:
 
-    <ul><li>A U+005A LATIN CAPITAL LETTER Z character (indicating the
-     time zone is UTC)</li>
+    <ul><li>A U+005A LATIN CAPITAL LETTER Z character, allowed only if
+     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>
+       HYPHEN-MINUS (-) character, representing the sign of the
+       timezone offset</li>
 
-       <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a> (representing the hours component of the timezone offset)</li>
+       <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a>,
+       representing the hours component <var title="">hour</var> of
+       the timezone offset, in the range 0&nbsp;&le;&nbsp;<var title="">hour</var>&nbsp;&le;&nbsp;23</li>
 
-       <li>A U+003A COLON character (:).</li>
+       <li>A U+003A COLON character (:)</li>
 
-       <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a> (representing the minutes component of the timezone offset)</li>
+       <li>Two <a href=#concept-datetime-digit title=concept-datetime-digit>digits</a>,
+       representing the minutes component <var title="">minute</var>
+       of the timezone offset, in the range 0&nbsp;&le;&nbsp;<var title="">minute</var>&nbsp;&le;&nbsp;59</li>
 
       </ol></li>
 
     </ul></li>
 
-  </ol><p>The aforementioned constraints are:<ul><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><div class=example>
+  </ol><p class=note>This format allows for time zone offsets from -23:59
+  to +23:59. In practice, however, the range of actual time zones is
+  -12:00 to +14:00, and the minutes component of actual time zones is
+  always either 00, 30, or 45.<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>
@@ -2654,9 +2677,7 @@
 
    <li><p>Return <var title="">time</var> and <var title="">timezone</var>.</li>
 
-  </ol><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
-  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
+  </ol><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
   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=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
Received on Thursday, 30 October 2008 01:44:41 GMT

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