if (    !m_Instances.attribute(i).isNominal() && !m_Instances.attribute(i).isNumeric() )
if (   (    !m_Instances.attribute(i).isNominal() && !m_Instances.attribute(i).isNumeric() ) || m_Instances.attribute(i).isDate() )
  protected void setUp() throws Exception {    super.setUp();        // remove attributes that are not nominal/numeric    int i = 0;    while (i < m_Instances.numAttributes()) {      if (    !m_Instances.attribute(i).isNominal()           && !m_Instances.attribute(i).isNumeric() )        m_Instances.deleteAttributeAt(i);      else        i++;    }  }