Method ToYearMonthDay

be/src/runtime/date-value.cc:223–247

}

bool DateValue::ToYearMonthDay(int* year, int* month, int* day) const {
  DCHECK(year != nullptr);
  DCHECK(month != nullptr);
  DCHECK(day != nullptr);
  if (UNLIKELY(!IsValid())) return false;

  // Uses the same method to calculate the year as DateValue::ToYear().
  int tmp = days_since_epoch_ * 400 + 287811200;
  int first_year = (tmp - 591) / 146097;
  int last_year = (tmp + 288) / 146097;

  int jan1_dse = CalcFirstDayOfYearSinceEpoch(last_year);
  if (jan1_dse <= days_since_epoch_) {
    *year = last_year;
  } else {
    *year = first_year;
    jan1_dse -= IsLeapYear(first_year) ? 366 : 365;
  }
  DCHECK(*year >= MIN_YEAR && *year <= MAX_YEAR);

  // Day of year. 0 is used for January 1.
  int days_since_jan1 = days_since_epoch_ - jan1_dse;

  return GetMonthAndDayFromDaysSinceJan1(*year, days_since_jan1, month, day);
}

int DateValue::WeekDay() const {
  if (UNLIKELY(!IsValid())) return -1;