diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/data/resourceload/LoadTimeLine.java b/ganttzk/src/main/java/org/zkoss/ganttz/data/resourceload/LoadTimeLine.java
index 8227ae8d5..044c82d5f 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/data/resourceload/LoadTimeLine.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/data/resourceload/LoadTimeLine.java
@@ -23,15 +23,38 @@ package org.zkoss.ganttz.data.resourceload;
 
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.Date;
 import java.util.List;
 
+import org.apache.commons.collections.ComparatorUtils;
 import org.apache.commons.lang.Validate;
 import org.joda.time.LocalDate;
 import org.zkoss.ganttz.util.Interval;
 
 public class LoadTimeLine {
 
+    @SuppressWarnings("unchecked")
+    private static final Comparator<LocalDate> nullSafeComparator = ComparatorUtils
+            .nullLowComparator(ComparatorUtils.naturalComparator());
+
+    public static Comparator<LoadTimeLine> byStartAndEndDate() {
+        return new Comparator<LoadTimeLine>() {
+
+            @Override
+            public int compare(LoadTimeLine o1, LoadTimeLine o2) {
+                int result = nullSafeComparator.compare(o1.getStartPeriod(),
+                        o2.getStartPeriod());
+                if (result == 0) {
+                    return nullSafeComparator.compare(o1.getEndPeriod(),
+                            o2.getEndPeriod());
+                }
+                return result;
+
+            }
+        };
+    }
+
     private final String conceptName;
     private final List<LoadPeriod> loadPeriods;
 
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/resourceload/ResourceLoadModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/resourceload/ResourceLoadModel.java
index 14a28cdda..44b519149 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/resourceload/ResourceLoadModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/resourceload/ResourceLoadModel.java
@@ -26,6 +26,7 @@ import static org.navalplanner.web.I18nHelper._;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
@@ -457,6 +458,7 @@ public class ResourceLoadModel implements IResourceLoadModel {
         result.addAll(buildSubLevels(criterion, ResourceAllocation.getOfType(
                 GenericResourceAllocation.class, allocations)));
         result.add(buildRelatedSpecificAllocations(criterion, allocations));
+        Collections.sort(result, LoadTimeLine.byStartAndEndDate());
         return result;
     }
 
@@ -507,6 +509,7 @@ public class ResourceLoadModel implements IResourceLoadModel {
                 onlyGeneric(allocations)));
         result.addAll(buildTimeLinesForEachResource(criterion,
                 onlySpecific(allocations), getCurrentTimeLineRole(order)));
+        Collections.sort(result, LoadTimeLine.byStartAndEndDate());
         return result;
     }
 
@@ -755,6 +758,7 @@ public class ResourceLoadModel implements IResourceLoadModel {
                 onlySpecific(sortedByStartDate)));
         result.addAll(buildTimeLinesForEachCriterion(resource,
                 onlyGeneric(sortedByStartDate)));
+        Collections.sort(result, LoadTimeLine.byStartAndEndDate());
         return result;
     }