//ISO日期转换为UTC日期

public XMLGregorianCalendar xmlToDate(Date date){

    GregorianCalendar cal = new GregorianCalendar();

        cal.setTime(date);

        XMLGregorianCalendar gc = null;

        try {

            gc = DatatypeFactory.newInstance().newXMLGregorianCalendar(cal);

        } catch (Exception e) {

             e.printStackTrace();

        }

    return gc;

}  

//UTC日期转换为ISO日期

public Date DateToXML(XMLGregorianCalendar gc){

    GregorianCalendar ca = gc.toGregorianCalendar();

        return ca.getTime();

}