# File lib/vpim/property/recurrence.rb, line 36
        def occurrences(dountil = nil, &block) #:yield: occurrence time
          rr = rrule
          unless block_given?
            return Enumerable::Enumerator.new(self, :occurrences, dountil)
          end

          rr.each(dountil, &block)
        end