code: @Override public int compareTo(DateRange o)
     {
        int result = net.sf.mpxj.common.DateHelper.compare(m_start, o.m_start);
        if (result == 0)
        {
           result = net.sf.mpxj.common.DateHelper.compare(m_end, o.m_end);
        }
        return result;
     }
docs: {@inheritDoc}