def period_for_local(time, dst = true)
      tzinfo.period_for_local(time, dst) { |periods| periods.last }
    end
def period_for_local(time, dst = true)
      tzinfo.period_for_local(time, dst) { |periods| periods.last }
    end
Available so that TimeZone instances respond like TZInfo::Timezone
 instances.