# File lib/aws/auto_scaling/scheduled_action.rb, line 92
      def update options = {}
        options.update(resource_options)
        # convert times to formatted strings
        [:start_time, :end_time].each do |opt|
          if options[opt].is_a?(Time)
            options[opt] = options[opt].iso8601
          end
        end
        client.put_scheduled_update_group_action(options)
        nil
      end