code: def get_archive_part_value(self, part):
          
          parts_dict = {'year': '%Y',
                        'month': self.month_format,
                        'week': self.week_format,
                        'day': '%d'}
          if self.today is None:
              today = timezone.now()
              if timezone.is_aware(today):
                  today = timezone.localtime(today)
              self.today = today
          return self.today.strftime(parts_dict[part])
docs: Return archive part for today