Function get_date_from_days

python/pyarrow/src/arrow/python/datetime.cc:196–215

Extracts the month and year and day number from a number of days

// Extracts the month and year and day number from a number of days
static void get_date_from_days(int64_t days, int64_t* date_year, int64_t* date_month,
                               int64_t* date_day) {
  int64_t *month_lengths, i;

  *date_year = days_to_yearsdays(&days);
  month_lengths = _days_per_month_table[is_leapyear(*date_year)];

  for (i = 0; i < 12; ++i) {
    if (days < month_lengths[i]) {
      *date_month = i + 1;
      *date_day = days + 1;
      return;
    } else {
      days -= month_lengths[i];
    }
  }

  // Should never get here
  return;
}

// Splitting time quantities, for example splitting total seconds into
// minutes and remaining seconds. After we run