docs: def format_date(self, dl_string):
          """Formats various date formats to dd.MM.
  
          Examples
          - January 15th      --> 15.01.
          - 15.01.2017        --> 15.01.
          - 15th of January   --> 15.01.
          - 15.1.             --> 15.01.
  
          Keyword arguments:
          dl_string -- a string to be formatted
  
          Returns:
          Date string in format dd.MM. or "None.None"
          """
          thedate = get_simple_date(dl_string)
          if thedate != "Failed" and thedate:
              return thedate
  
          day = get_day_of_month(dl_string)
          month = get_month(dl_string)
  
          return day + '.' + month + '.'