@Override public ValueRange range(TemporalField field) { if (field instanceof ChronoField) { if (isSupported(field)) { ChronoField f = (ChronoField) field; switch (f) { case DAY_OF_MONTH: case DAY_OF_YEAR: case ALIGNED_WEEK_OF_MONTH: return isoDate.range(field); case YEAR_OF_ERA: { ValueRange range = YEAR.range(); long max = (getProlepticYear() <= 0 ? -(range.getMinimum() + YEARS_DIFFERENCE) + 1 : range.getMaximum() + YEARS_DIFFERENCE); return ValueRange.of(1, max); } } return getChronology().range(f); } throw new UnsupportedTemporalTypeException("Unsupported field: " + field); } return field.rangeRefinedBy(this); }