XMLGregorianCalendar to GregorianCalendar and back - inconsistent results

Consider the output from the code below with and without the call to get Calendar.HOUR_OF_DAY:

    XMLGregorianCalendar cal = datatypeFactory.newXMLGregorianCalendar("1994-08-10T00:00:00Z");
    System.out.println("Cal: " + cal);

    GregorianCalendar gCal = cal.toGregorianCalendar();

    gCal.get(Calendar.HOUR_OF_DAY); // this line makes a difference

    gCal.setTimeZone(TimeZone.getTimeZone("GMT-07"));                  

    XMLGregorianCalendar newCal =  datatypeFactory.newXMLGregorianCalendar(gCal.get(Calendar.YEAR), 
            gCal.get(Calendar.MONTH)+1, gCal.get(Calendar.DAY_OF_MONTH), 
            gCal.get(Calendar.HOUR_OF_DAY), 
            gCal.get(Calendar.MINUTE), gCal.get(Calendar.SECOND), 
            gCal.get(Calendar.MILLISECOND), 
            (gCal.get(Calendar.ZONE_OFFSET) + gCal.get(Calendar.DST_OFFSET))/60000);        
    System.out.println("New Cal: " + newCal);

With call to get(Calendar.HOUR_OF_DAY), the output is:

Cal: 1994-08-10T00:00:00Z

New Cal: 1994-08-09T17:00:00.000-07:00

Without the call to get(Calendar.HOUR_OF_DAY), the output is:

Cal: 1994-08-10T00:00:00Z

New Cal: 1994-08-10T00:00:00.000-07:00

Looks like the the get() call on GregorianCalendar kicks off some kind of field compute resolutions? Seems odd that this would be the case. Am I missing something?

ansaurus

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XMLGregorianCalendar to GregorianCalendar and back - inconsistent results

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