[html5] r5913 - [] (0) Change what was non-normatively implied to be proleptic UTC to explicitly [...]
whatwg at whatwg.org
whatwg at whatwg.org
Thu Feb 24 23:53:00 PST 2011
Author: ianh
Date: 2011-02-24 23:52:59 -0800 (Thu, 24 Feb 2011)
New Revision: 5913
Modified:
complete.html
index
source
Log:
[] (0) Change what was non-normatively implied to be proleptic UTC to explicitly and normatively be proleptic UT1.
Fixing http://www.w3.org/Bugs/Public/show_bug.cgi?id=11616
Modified: complete.html
===================================================================
--- complete.html 2011-02-25 07:13:08 UTC (rev 5912)
+++ complete.html 2011-02-25 07:52:59 UTC (rev 5913)
@@ -5097,6 +5097,15 @@
zones is -12:00 to +14:00, and the minutes component of offsets of
actual time zones is always either 00, 30, or 45.</p>
+ <p>Times in dates before the formation of UTC in the mid twentieth
+ century must be expressed and interpreted in terms of UT1
+ (contemporary Earth solar time at the 0° longitude), not UTC
+ (the approximation of UT1 that ticks in SI seconds). Time before the
+ formation of time zones must be expressed and interpeted as UT1
+ times with explicit time zones that approximate the contemporary
+ difference between the appropriate local time and the time observed
+ at the location of Greenwich, London.</p>
+
<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
@@ -5104,9 +5113,9 @@
<dl><dt>"<code>0037-12-13T00:00Z</code>"</dt>
- <dd>Midnight UTC on the birthday of Nero (the Roman Emperor). See
- below for further discussion on which date this actually
- corresponds to.</dd>
+ <dd>Midnight in areas using London time on the birthday of Nero
+ (the Roman Emperor). See below for further discussion on which
+ date this actually corresponds to.</dd>
<dt>"<code>1979-10-14T12:00:00.001-04:00</code>"</dt>
@@ -5127,21 +5136,27 @@
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 proleptic Gregorian Calendar.</li> <!--
- 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. -->
+ introduction of the Gregorian calendar (insofar as moments in time
+ before the formation of UTC can be unambiguously identified), 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 proleptic
+ Gregorian Calendar.</li> <!-- 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 time-zone offset components are not optional.</li>
<li>Dates before the year one can't be represented as a datetime
in this version of HTML.</li>
+ <li>Times of specific events in ancient times are, at best,
+ approximations, since time was not well coordinated or measured
+ until relatively recent decades.</li>
+
<li>Time-zone offsets differ based on daylight savings time.</li>
</ul></div>
Modified: index
===================================================================
--- index 2011-02-25 07:13:08 UTC (rev 5912)
+++ index 2011-02-25 07:52:59 UTC (rev 5913)
@@ -5077,6 +5077,15 @@
zones is -12:00 to +14:00, and the minutes component of offsets of
actual time zones is always either 00, 30, or 45.</p>
+ <p>Times in dates before the formation of UTC in the mid twentieth
+ century must be expressed and interpreted in terms of UT1
+ (contemporary Earth solar time at the 0° longitude), not UTC
+ (the approximation of UT1 that ticks in SI seconds). Time before the
+ formation of time zones must be expressed and interpeted as UT1
+ times with explicit time zones that approximate the contemporary
+ difference between the appropriate local time and the time observed
+ at the location of Greenwich, London.</p>
+
<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
@@ -5084,9 +5093,9 @@
<dl><dt>"<code>0037-12-13T00:00Z</code>"</dt>
- <dd>Midnight UTC on the birthday of Nero (the Roman Emperor). See
- below for further discussion on which date this actually
- corresponds to.</dd>
+ <dd>Midnight in areas using London time on the birthday of Nero
+ (the Roman Emperor). See below for further discussion on which
+ date this actually corresponds to.</dd>
<dt>"<code>1979-10-14T12:00:00.001-04:00</code>"</dt>
@@ -5107,21 +5116,27 @@
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 proleptic Gregorian Calendar.</li> <!--
- 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. -->
+ introduction of the Gregorian calendar (insofar as moments in time
+ before the formation of UTC can be unambiguously identified), 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 proleptic
+ Gregorian Calendar.</li> <!-- 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 time-zone offset components are not optional.</li>
<li>Dates before the year one can't be represented as a datetime
in this version of HTML.</li>
+ <li>Times of specific events in ancient times are, at best,
+ approximations, since time was not well coordinated or measured
+ until relatively recent decades.</li>
+
<li>Time-zone offsets differ based on daylight savings time.</li>
</ul></div>
Modified: source
===================================================================
--- source 2011-02-25 07:13:08 UTC (rev 5912)
+++ source 2011-02-25 07:52:59 UTC (rev 5913)
@@ -4386,6 +4386,15 @@
zones is -12:00 to +14:00, and the minutes component of offsets of
actual time zones is always either 00, 30, or 45.</p>
+ <p>Times in dates before the formation of UTC in the mid twentieth
+ century must be expressed and interpreted in terms of UT1
+ (contemporary Earth solar time at the 0° longitude), not UTC
+ (the approximation of UT1 that ticks in SI seconds). Time before the
+ formation of time zones must be expressed and interpeted as UT1
+ times with explicit time zones that approximate the contemporary
+ difference between the appropriate local time and the time observed
+ at the location of Greenwich, London.</p>
+
<div class="example">
<p>The following are some examples of dates written as <span
@@ -4396,9 +4405,9 @@
<dt>"<code>0037-12-13T00:00Z</code>"</dt>
- <dd>Midnight UTC on the birthday of Nero (the Roman Emperor). See
- below for further discussion on which date this actually
- corresponds to.</dd>
+ <dd>Midnight in areas using London time on the birthday of Nero
+ (the Roman Emperor). See below for further discussion on which
+ date this actually corresponds to.</dd>
<dt>"<code>1979-10-14T12:00:00.001-04:00</code>"</dt>
@@ -4423,21 +4432,27 @@
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 proleptic Gregorian Calendar.</li> <!--
- 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. -->
+ introduction of the Gregorian calendar (insofar as moments in time
+ before the formation of UTC can be unambiguously identified), 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 proleptic
+ Gregorian Calendar.</li> <!-- 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 time-zone offset components are not optional.</li>
<li>Dates before the year one can't be represented as a datetime
in this version of HTML.</li>
+ <li>Times of specific events in ancient times are, at best,
+ approximations, since time was not well coordinated or measured
+ until relatively recent decades.</li>
+
<li>Time-zone offsets differ based on daylight savings time.</li>
</ul>
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