docs: def get_last_modified_date(filename):
      """
      Get the last modified date of a given file
  
      :param filename: string: pathname of a file
      :return: Date
      """
      if os.path.isfile(filename):
          t = os.path.getmtime(filename)
          return datetime.date.fromtimestamp(t).strftime('%d/%m/%Y')
      return None