public Questionnaire setDate(Date value) { 
      if (value == null)
        this.date = null;
      else {
        if (this.date == null)
          this.date = new DateTimeType();
        this.date.setValue(value);
      }
      return this;
    }
public Questionnaire setDate ( Date value ) { if ( value == null ) this . date = null ; else { if ( this . date == null ) this . date = new DateTimeType ( ) ; this . date . setValue ( value ) ; } return this ; }
@param value The date that this questionnaire was last changed.