code: public void setEndDateTime(com.google.api.ads.admanager.axis.v201808.DateTime endDateTime) {
          this.endDateTime = endDateTime;
      }
docs: Sets the endDateTime value for this LineItemCreativeAssociation.
  
  @param endDateTime   * Overrides {@link LineItem#endDateTime}. This value is optional
  and is only
  valid for Ad Manager 360 networks.