Distinction between 00:00:00 and 24:00:00 for time datatype?


     According to section 3.2.8 of "XML Schema:  Datatypes" [1]:

The order relation on time values is the Order relation on dateTime ( using an arbitrary date.

     Thus, if one considers the ordering of the values 00:00:00 and 
24:00:00, using the arbitrary date 2002-03-06, the ordering is the same as 
that for 2002-03-06T00:00:00 and 2002-03-06T24:00:00.  The latter value is 
the same as 2002-03-07T00:00:00.  So, according to the definition of the 
order relation cited above, 00:00:00 < 24:00:00.

     However, according to the definition of the canonical representation 
of time in section [2]

the canonical representation for midnight is 00:00:00

The definition of the canonical representation would seem to imply that 
00:00:00 and 24:00:00 are considered to be the same time value.

     I believe one of these two sections is incorrect.



[1] http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/#time
[2] http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/#time-canonical-repr
Henry Zongaro      XML Parsers development
IBM SWS Toronto Lab   Tie Line 969-6044;  Phone (905) 413-6044

Received on Wednesday, 6 March 2002 09:59:05 UTC