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[Bug 13260] New: dateTime time-on-timeline incorrect for BCE years?

From: <bugzilla@jessica.w3.org>
Date: Thu, 14 Jul 2011 20:12:46 +0000
To: www-xml-schema-comments@w3.org
Message-ID: <bug-13260-703@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=13260

           Summary: dateTime time-on-timeline incorrect for BCE years?
           Product: XML Schema
           Version: 1.1 only
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Datatypes: XSD Part 2
        AssignedTo: David_E3@VERIFONE.com
        ReportedBy: alexhall@revelytix.com
         QAContact: www-xml-schema-comments@w3.org
                CC: cmsmcq@blackmesatech.com


Step 3a of http://www.w3.org/TR/xmlschema11-2/#vp-dt-timeOnTimeline (leap-year
days correction) does not take into account the fact that 1BCE (='0000' in
dateTime lexical form) is a leap year. As a result, the calculated
time-on-timeline value is off by one day for all BCE dates.

Applying the algorithm as written, I came up with the following timeline
values:

ToTl("0001-01-01T00:00:00Z") = 0
ToTl("0000-12-31T00:00:00Z") = 0 (should be -86400)

I believe the following modifications to the ToTl will correct this problem:

1. Remove the -1 offset from the definition of yr:
   * Let yr be 1972 when dt's year is absent, and dt's year otherwise.

2. Include the -1 offset in step 2a:
   * Set ToTl to 31536000 x (yr - 1)

3. Change the leap-year adjustment in step 3a as follows:
   * Add 86400 * ((yr - 4) div 4 - (yr - 100) div 100 + (yr - 400) div 400) to
ToTl

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Received on Thursday, 14 July 2011 20:12:51 GMT

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