webservice时间类型XMLGregorianCalendar和Date的转换

//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();
}