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2437Define meaning of dates before 1582.2008-11-25 11:02
@@ -1991,22 +1991,22 @@
 
   <p>The <dfn 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.</p>
 
 
   <h5>Months</h5>
 
   <p>A <dfn 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
+  proleptic Gregorian date with no timezone information and no date
+  information beyond a year and a month. <a
   href="#refsGREGORIAN">[GREGORIAN]</a></p>
 
   <p>A string is a <dfn>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:</p>
 
   <ol>
 
    <li>Four or more <span
    title="concept-datetime-digit">digits</span>, representing <var
@@ -2083,22 +2083,23 @@
 
    <li><p>Return <var title="">year</var> and <var
    title="">month</var>.</p></li>
 
   </ol>
 
 
   <h5>Dates</h5>
 
   <p>A <dfn 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="#refsGREGORIAN">[GREGORIAN]</a></p>
+  proleptic Gregorian date with no timezone information, consisting of
+  a year, a month, and a day. <a
+  href="#refsGREGORIAN">[GREGORIAN]</a></p>
 
   <p>A string is a <dfn>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:</p>
 
   <ol>
 
    <li>A <span>valid month string</span>, representing <var
    title="">year</var> and <var title="">month</var></li>
@@ -2349,24 +2350,24 @@
    <li><p>Return <var title="">hour</var>, <var title="">minute</var>,
    and <var title="">second</var>.</p></li>
 
   </ol>
 
 
 
   <h5>Local dates and times</h5>
 
   <p>A <dfn 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="#refsGREGORIAN">[GREGORIAN]</a></p>
+  consists of a specific proleptic 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="#refsGREGORIAN">[GREGORIAN]</a></p>
 
   <p>A string is a <dfn>valid local date and time string</dfn>
   representing a date and time if it consists of the following
   components in the given order:</p>
 
   <ol>
 
    <li>A <span>valid date string</span> representing the date.</li>
 
    <li>A U+0054 LATIN CAPITAL LETTER T character.</li>
@@ -2417,24 +2418,24 @@
    <li><p>Return <var title="">date</var> and <var
    title="">time</var>.</p></li>
 
   </ol>
 
 
 
   <h5>Global dates and times</h5>
 
   <p>A <dfn 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
+  consists of a specific proleptic 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="#refsGREGORIAN">[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>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:</p>
@@ -2519,23 +2520,23 @@
    <p>Several things are notable about these dates:</p>
 
    <ul>
 
     <li>Years with fewer than four digits have to be
     zero-padded. The date "37-12-13" would not be a valid date.</li>
 
     <li>To unambiguously identify a moment in time prior to the
     introduction of the Gregorian calendar, the date has to be first
     converted to the Gregorian calendar from the calendar in use at
-    the time (e.g. from the Julian calendar). The date of Nero's
-    birth is the 15th of December 37, in the Julian Calendar, which
-    is the 13th of December 37 in the Gregorian Calendar.</li> <!--
+    the time (e.g. from the Julian calendar). The date of Nero's birth
+    is the 15th of December 37, in the Julian Calendar, which is the
+    13th of December 37 in the proleptic Gregorian Calendar.</li> <!--
     XXX this might not be true. I can't find a reference that gives
     his birthday with an explicit statement about the calendar being
     used. However, it seems unlikely that it would be given in the
     Gregorian calendar, so I assume sites use the Julian one. -->
 
     <li>The time and timezone components are not optional.</li>
 
     <li>Dates before the year zero can't be represented as a datetime
     in this version of HTML.</li>
 
@@ -2699,33 +2700,34 @@
   week-year in this calendaring system has either 52 weeks or 53
   weeks, as defined below. A week is a seven-day period. The week
   starting on the Gregorian date Monday December 29th 1969
   (1969-12-29) is defined as week number 1 in week-year
   1970. Consecutive weeks are numbered sequentially. The week before
   the number 1 week in a week-year is the last week in the previous
   week-year, and vice versa. <a
   href="#refsGREGORIAN">[GREGORIAN]</a></p>
 
   <p>A week-year with a number <var title="">year</var> that
-  corresponds to a year <var title="">year</var> in the Gregorian
-  calendar that has a Thursday as its first day (January 1st), and a
-  week-year <var title="">year</var> where <var title="">year</var> is
-  a number divisible by 400, or a number divisible by 4 but not by
-  100, has 53 weeks. All other week-years have 52 weeks.</p>
+  corresponds to a year <var title="">year</var> in the proleptic
+  Gregorian calendar that has a Thursday as its first day (January
+  1st), and a week-year <var title="">year</var> where <var
+  title="">year</var> is a number divisible by 400, or a number
+  divisible by 4 but not by 100, has 53 weeks. All other week-years
+  have 52 weeks.</p>
 
   <p>The <dfn>week number of the last day</dfn> of a week-year with 53
   weeks is 53; the week number of the last day of a week-year with 52
   weeks is 52.</p>
 
   <p class="note">The week-year number of a particular day can be
   different than the number of the year that contains that day in the
-  Gregorian calendar. The first week in a week-year <var
+  proleptic Gregorian calendar. The first week in a week-year <var
   title="">year</var> is the week that contains the first Thursday of
   the Gregorian year <var title="">year</var>.</p>
 
   <p>A string is a <dfn>valid week string</dfn> representing a
   week-year <var title="">year</var> and week <var title="">week</var>
   if it consists of the following components in the given order:</p>
 
   <ol>
 
    <li>Four or more <span

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