@Entity
@Table(name = "events")
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Events implements Serializable, IdAble {
    @Column(name = "DATE_EVENT")
    @Temporal(TemporalType.DATE)
    private Date dateEvent;
    @Column(name = "DATE_REGISTRATION")
    @Temporal(TemporalType.DATE)
    private Date dateRegistration;
    @Column(name = "DATE_DECISION")
    @Temporal(TemporalType.DATE)
    private Date dateDecision;
// get set
}

 public String toXML(Object obj, Class cl) throws JAXBException {
        JAXBContext jaxbContext = JAXBContext.newInstance(cl);
        Marshaller marshaller = jaxbContext.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, formatedOutput);
        CharArrayWriter writer = new CharArrayWriter();
        marshaller.marshal(obj, writer);
        return writer.toString();
    }

      <dateEvent>1300-03-08T00:00:00+02:00</dateEvent>
      <dateRegistration>2853-05-30T00:00:00+03:00</dateRegistration>
      <dateDecision>1463-05-02T00:00:00+02:00</dateDecision>

 <dateEvent>1300-03-08T00:00:00+02:00</dateEvent>