initCentralDate() {
    if (this.selectedDate) {
      this.focusSelectedDate();
    } else {
      if (!this.__isEnabledDate(/** @type {Date} */ (this.__initialCentralDate))) {
        this.centralDate = this.findNearestEnabledDate(this.__initialCentralDate);
      } else {
        this.centralDate = /** @type {Date} */ (this.__initialCentralDate);
      }
      this.focusCentralDate();
    }
  }
This exposes an interface for datepickers that want to
reinitialize when calendar is opened