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RE: Year 0000

From: Ashok Malhotra <ashokma@microsoft.com>
Date: Fri, 10 Aug 2001 13:11:14 -0700
Message-ID: <E5B814702B65CB4DA51644580E4853FB8D4E97@red-msg-12.redmond.corp.microsoft.com>
To: <zongaro@ca.ibm.com>
Cc: <www-xml-schema-comments@w3.org>, <w3-xml-schema-wg@w3.org>, <lmartin@ca.ibm.com>
Yes, I came to the same conclusion after rereading the 2000 version of
ISO 8601.

I think we need to consider this as a possible errata item.

Lisa, can you please add to the errata list.

 

All the best, Ashok 
=========================================================== 



-----Original Message-----
From: zongaro@ca.ibm.com [mailto:zongaro@ca.ibm.com] 
Sent: Friday, August 10, 2001 1:01 PM
To: Ashok Malhotra
Cc: www-xml-schema-comments@w3.org; w3-xml-schema-wg@w3.org;
lmartin@ca.ibm.com
Subject: RE: Year 0000

 



Hi Ashok, 

     Although ISO 8601:2000 isn't entirely clear on the point, it does
say that the year numbers are contiguous.  I take that to mean that 0000
is the year before 0001, and -0001 is the year before that.  That would
mean 0000 is what is usually referred to as 1 BC (or 1 BCE) and -0001 is
2 BC (or 2 BCE). 

     If my understanding is correct, that means the years that are
commonly called 1BC (0000) and 5BC (-0004) are leap years in the
proleptic Gregorian calendar, but 4BC (-0003) is not.

Thanks,

Henry
------------------------------------------------------------------------
Henry Zongaro      XML Parsers development
IBM SWS Toronto Lab   Tie Line 778-6044;  Phone (416) 448-6044
mailto:zongaro@ca.ibm.com

Please respond to "Ashok Malhotra" <ashokma@microsoft.com> 

To:        Henry Zongaro/Toronto/IBM@IBMCA,
<www-xml-schema-comments@w3.org> 
cc:        <w3-xml-schema-wg@w3.org>, Lisa Martin/Toronto/IBM@IBMCA 
Subject:        RE: Year 0000 


I found additional confirmation that the 2000 version of ISO 8601 does,
indeed, allow the year 0000.  I don't know what it maps to in terms on
AD and BC because AD 1 == 0001 and BC 1 == -0001.  Should we discuss as
a possible errata item.
Ashok 

                -----Original Message----- 
                From: zongaro@ca.ibm.com 
                Sent: Thu 8/9/2001 2:02 PM 
                To: www-xml-schema-comments@w3.org 
                Cc: 
                Subject: Year 0000
                
                

                
                Hello, 
                
                     I just saw a copy of ISO 8601:2000.  I was
surprised to
discover that it defines 0000 to be a valid year, unlike the
specification of dateTime in the "XML Schema:  Datatypes" recommendation
[1].  I gather that in ISO 8601:2000, the year 0000 is roughly
equivalent to what people usually refer to as 1BC, and is a leap year. 
                
                     Should dateTime follow ISO 8601:2000 in this
respect?
                
                Thanks,
                
                Henry 
                [1]
http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/#dateTime
                
------------------------------------------------------------------------
                Henry Zongaro      XML Parsers development
                IBM SWS Toronto Lab   Tie Line 778-6044;  Phone (416)
448-6044
                mailto:zongaro@ca.ibm.com
Received on Friday, 10 August 2001 16:13:19 GMT

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