init daterangepicker

          //timeInput is optional and set by data-time-select attribute

          if (base.hasAttribute('data-time-select')) {

            console.log("render time input");

            base.renderTimeInput();

          }

        //1 hour

        this.setAttribute('data-daterange', 3600000);

      }

      this.updateDateTitle();

    };

    this.updateDateTitle = function() {

      var timestamp = parseInt(this.getAttribute('data-endtime'), 10);

      var date_range = parseInt(this.getAttribute('data-daterange'), 10);

      console.log(timestamp, date_range);

      var start_timestamp = timestamp - date_range;

      var title = this.shadowRoot.querySelector("span");