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Re: [whatwg] Fwd: <time>

From: Leif Halvard Silli <lhs@malform.no>
Date: Mon, 16 Mar 2009 13:14:52 +0100
Message-ID: <49BE42BC.3010505@malform.no>
To: Robert J Burns <rob@robburns.com>
CC: Aryeh Gregor <Simetrical+w3c@gmail.com>, Tom Duhamel <tom420.duhamel@gmail.com>, whatwg@lists.whatwg.org, "public-html@w3.org" <public-html@w3.org>
Robert J Burns 2009-03-16 12.32:
> On Mar 15, 2009, at 6:59 PM, Aryeh Gregor wrote:

> Even the Mayan Long Count 
> calendar can be represented in something resembling ISO 8601 by allowing 
> more than the three fields for the date (e.g., 
> "12-19-16-03-03t19:57+00:00").

> Again, HTML UAs can easily allow the 
> representation of these various calendar dates without imposing any 
> requirement burden on UAs to support conversion and extraction of these 
> alternative calendar dates (merely a requirement to recognize calendar 
> keywords and ignore unsupported calendars; in the case of Julian the 
> ISO-8601-style representation translates to the exact same localized 
> month names from 44 BC onward).

I can live with @datetime limited to ISO-8601, as long as 
@datetime also lives up to ISO-8601's own limitations: It isn't 
valid beyond 1582-10-15, and user agents that look at @datetime in 
order to present the date (to solve the ambiguous date problem), 
MUST therefore warn that it present a date which isn't valid for 
the time period.

Even for dates before 20 May 1875 (the reference point for ISO 
8601 - the signing of the meter convention, and the start of the 
standardising process, you could say) - Japan began using the 
Gregorian calendar around this time - it would be customary to 
inform the user that the date displayed is the Gregorian date.
-- 
leif halvard silli
Received on Monday, 16 March 2009 12:15:36 UTC

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