code: public ChronoLocalDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {
          return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);
      }
docs: Obtains a local date in this chronology from the era, year-of-era and
  day-of-year fields.
  
  @param era  the era of the correct type for the chronology, not null
  @param yearOfEra  the chronology year-of-era
  @param dayOfYear  the chronology day-of-year
  @return the local date in this chronology, not null
  @throws DateTimeException if unable to create the date
  @throws ClassCastException if the {@code era} is not of the correct type for the chronology