@Override
  public String marshal(DateTime v) throws Exception {
    return v.toString(FORMATTER);
  }
@Test
  public void marshal() throws Exception {
    XmlDateTimeAdapter adapter = new XmlDateTimeAdapter();
    DateTime dateTime = Instant.ofEpochMilli(1672347891171L).toDateTime(DateTimeZone.UTC);
    assertEquals("2022-12-29T21:04:51.171Z", adapter.marshal(dateTime));
  }