code: def from_ymd_to_excel(year, month, day):
      
      if not is_valid_ymd(year, month, day):
          raise ValueError("Invalid date {0}.{1}.{2}".format(year, month, day))
  
      days = _cum_month_days[month - 1] + day
      days += 1 if (is_leap_year(year) and month > 2) else 0
  
      years_distance = year - 1900
      days += years_distance * 365 + \
              (years_distance + 3) // 4 - (years_distance + 99) // 100 + (years_distance + 299) // 400
  
      # count days since 30.12.1899 (excluding 30.12.1899) (workaround for excel bug)
      days += 1 if (year, month, day) > (1900, 2, 28) else 0
      return days
docs: converts date as `(year, month, day)` tuple into Microsoft Excel representation style
  
      :param tuple(int, int, int): int tuple `year, month, day`
      :return int: