code: @Override protected Date parseNonNullDate(String str, ParsePosition pos)
     {
        Date result;
        if (str.equals(m_null) == true)
        {
           result = null;
           pos.setIndex(-1);
        }
        else
        {
           result = super.parseNonNullDate(str, pos);
        }
        return result;
     }
docs: {@inheritDoc}