code: @Override
      public long toEpochDay() {
          long year = prolepticYear;
          long accountingEpochDay = ((year - 1) * WEEKS_IN_YEAR + chronology.previousLeapYears(year)) * DAYS_IN_WEEK + (getDayOfYear() - 1);
          return accountingEpochDay - chronology.getDays0001ToIso1970();
      }
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