# File lib/aws/auto_scaling/scheduled_action.rb, line 93
      def update options = {}

        client_opts = options.dup
        client_opts[:scheduled_action_name] = name
        client_opts[:auto_scaling_group_name] = auto_scaling_group_name

        # convert these options to timestamps 
        [:start_time, :end_time].each do |opt|
          if client_opts[opt].is_a?(Time)
            client_opts[opt] = client_opts[opt].iso8601
          end
        end

        client.put_scheduled_update_group_action(client_opts)

        nil

      end