docs: def date_range_for_webtrends(cls, start_at=None, end_at=None):
          """
          Get the day dates in between start and end formatted for query.
          This returns dates inclusive e.g. final day is (end_at, end_at+1 day)
          """
          if start_at and end_at:
              start_date = cls.parse_standard_date_string_to_date(
                  start_at)
              end_date = cls.parse_standard_date_string_to_date(
                  end_at)
              numdays = (end_date - start_date).days + 1
              start_dates = [end_date - timedelta(days=x)
                             for x in reversed(range(0, numdays))]
              date_range = []
              for i, date in enumerate(start_dates):
                  query_date = cls.parse_date_for_query(date)
                  date_range.append((query_date, query_date))
              return date_range
          else:
              return [("current_day-1", "current_day-1")]