The CimHarvest.dealWithDuration method looks for:

final String startDate = CimXMLUtil.getNestedNodeText(node, "duration", "realCalendar", "range", "closedDateRange", "startDate");
final String endDate = CimXMLUtil.getNestedNodeText(node, "duration", "realCalendar", "range", "closedDateRange", "endDate");

The structures from the example files are as follows:

        <duration>
          <startDate>1859-12-01T00:00:00Z</startDate>
          <endDate>2359-12-01T23:59:59Z</endDate>
        </duration>

        <duration>
          <startDate>1960-1-1T00:00:00Z</startDate>
          <length units="Years">10.0</length>
        </duration>

The harvester needs to be changed to look for those structures.