assertEquals(18, dt.getCenturyOfEra()); // TODO confirm
assertEquals(20, dt.getYearOfCentury());
assertEquals(1720, dt.getYearOfEra());
assertEquals(1720, dt.getYear());
Property fld = dt.year();
assertEquals(false, fld.isLeap());
assertEquals(0, fld.getLeapAmount());
assertEquals(DurationFieldType.days(), fld.getLeapDurationField().getType());
assertEquals(new DateTime(1721, 10, 2, 0, 0, 0, 0, COPTIC_UTC), fld.addToCopy(1));