public void setZone(TimeZone zone) {
    TimeZone old = this.zone;
    this.zone = zone;
    monthComboBoxRenderer.setZone(zone);
    monthComboBoxModel.setZone(zone);
    yearSpinnerModel.setZone(zone);
    firePropertyChange(PROPERTY_NAME_ZONE, old, zone);
  }
public void setZone(TimeZone zone)