code: def select_date(self, rows: List[Row], column: DateColumn) -> Date:
          
          dates: List[Date] = []
          for row in rows:
              cell_value = row.values[column.name]
              if isinstance(cell_value, Date):
                  dates.append(cell_value)
  
          return dates[0] if dates else Date(-1, -1, -1)
docs: Select function takes a row as a list and a column name and returns the date in that column.