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RE: midnight in ISO 8601 (was: Re: Notes on the say-as note)

From: Pawson, David <David.Pawson@rnib.org.uk>
Date: Thu, 2 Jun 2005 08:17:19 +0100
Message-ID: <47DFC5E9D8B9E4429C2861946386EA9901E9BA83@pbrmsx01.ads.rnib.org.uk>
To: "C. M. Sperberg-McQueen" <cmsmcq@acm.org>, <www-voice@w3.org>

    In the interests of having a clear record, perhaps it 
    should be pointed out that if one would rather "stay with" 
    ISO 8601, then the value 24 really does need to be allowed 
    to appear in the hours field of time expressions.  The 
    copies of ISO 8601 I have on my shelf (the IS of 1988 and a 
    "final draft" 
    from 2000) both specifically mention that midnight may be 
    denoted either as "00:00:00" or as "24:00:00" 
    (clause 5.3.2 in each case).  
    I suspect Mr. Pawson was misled by the restriction to the 
    range 00-23 in the profile at 
    http://www.w3.org/TR/NOTE-datetime -- this is a change 
    vis-a-vis ISO 8601, not a reflection of a restriction made 
    by ISO 8601.

If W3C notes are misleading, then
perhaps that is the item that needs clarification.
My goal was regularisation.

    In the context of the SSML 1.0 say-as element, it seems 
    clear to me that Eira Monstad is right to suggest that a 
    restriction to the range 0-23 is unhelpful in the task of 
    describing time expressions in unconstrained 
    natural-language text, and that the range 0-24 would be more useful.

If a specific time & day is needed, then 24:00 hours on day n is
exactly equivalent of 00:00 hours on day n +1.

regards DaveP.


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Received on Thursday, 2 June 2005 07:18:12 UTC

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