2000-01-01+13:00 and 1999-12-31−11:00 are equal?

• From: Costello, Roger L. <costello@mitre.org>
• Date: Mon, 17 Sep 2012 19:31:29 +0000
• To: "xmlschema-dev@w3.org" <xmlschema-dev@w3.org>
• Message-ID: <B5FEE00B53CF054AA8439027E8FE17751E65D2CB@IMCMBX04.MITRE.ORG>

Hi Folks,

In the XSD 1.1 data types specification it says this in the discussion of the "date" data type:

    Some date values with different time zone offsets 
    that were identical in the 1.0 version of this 
    specification, such as 2000-01-01+13:00 and 
    1999-12-31−11:00, are in this version of this 
    specification equal ...

That seems to be a mistake. 

How can adding 13 hours onto January 1, 2000 equal December 31, 1999 minus 11 hours?

/Roger

Received on Monday, 17 September 2012 19:31:57 UTC