@Test
void canSerializeCalendar_no_time() {

    Calendar cal = GregorianCalendar.getInstance();
    cal.set(1985, 6, 3, 0, 0, 0);
    cal.set(Calendar.MILLISECOND, 0);
    TestDates test = getCalendar(cal);
    String actual = om.writeValue(test);
    assertEquals("{\"calendar\":\"1985-07-03T00:00:00Z\"}", actual);
}