private List<WorkReportLine> filterWorkReportLinesByDate(
     Collection<WorkReportLine> lines, AvailabilityTimeLine.Interval interval) {
   List<WorkReportLine> result = new ArrayList<WorkReportLine>();
   for (WorkReportLine line : lines) {
     if (interval.includes(line.getLocalDate())) {
       result.add(line);
     }
   }
   return result;
 }