code: def tuple_to_string(date_tuple):
      
      if len(date_tuple) == 2:
          # It's yyyy-mm
          return str(date_tuple[0]).zfill(4) + '-' + str(date_tuple[1]).zfill(2)
      # It's yyyy-mm-dd
      return str(date_tuple[0]).zfill(4) + '-' + str(date_tuple[1]).zfill(2) + '-' + str(date_tuple[2]).zfill(2)
docs: Create a yyyy-mm(-dd) string from a tuple containing (yyyy, m) (or one with the day too)