# File lib/ri_cal/component/timezone.rb, line 44
        def periods_for_local(local)
          local = local.to_ri_cal_date_time_value
          candidate_standard = last_before_local(standard, local)
          candidate_daylight = last_before_local(daylight, local)
          if candidate_daylight && candidate_daylight.swallows_local?(local, candidate_standard)
            []  # Invalid local time
          elsif candidate_standard
            if candidate_daylight
              if candidate_daylight.dtstart > candidate_standard.dtstart
                [candidate_daylight]
              elsif candidate_standard.ambiguous_local?(local)
                [candidate_daylight, candidate_standard]
              else
                [candidate_standard].compact
              end
            else
              [candidate_standard].compact
            end
          end
        end