docs: def date_is_valid(dates):
      """Checks if dates (e.g. ["17", "11"] ) is valid and returns bool
  
      Checks if the first element is between 1 and 31
      and the second element is between 1 and 12.
  
  
      Keyword arguments:
      dates -- list of numbers
  
      Returns:
      True if the date is valid, False otherwise.
      """
      if (int(dates[0]) < 1 or
              int(dates[0]) > 31 or
              int(dates[1]) < 1 or
              int(dates[1]) > 12):
  
          return False
      return True