_clockChange(evt) {
      const index = this._getIndexFromId(evt.target.id);
      const stringValue = evt.detail.stringValue;
      const value = evt.detail.value;
      const button = this._buttonComponent(index);
      if (!button) {
        return;
      }
      this._entities[index].stringValue = stringValue;
      this._entities[index].value = value;
      this._entities = JSON.parse(JSON.stringify(this._entities));
      switch (index) {
        case this._componentMap.hours:
          this._hoursChange(value);
          break;
        case this._componentMap.minutes:
          this._minutesChange(value);
          break;
        case this._componentMap.seconds:
          this._secondsChange(value);
          break;
      }
      if (evt.detail.finalChange) {
        if (this._activeIndex < this._entities.length - 1) {
          this._switchNextClock();
        } else {
          button.focus();
        }
      }
    }
Clock 'change' event handler.

@param {event} evt Event object