diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/FunctionalityExposedForExtensions.java b/ganttzk/src/main/java/org/zkoss/ganttz/FunctionalityExposedForExtensions.java
index ebd28abf8..f21297473 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/FunctionalityExposedForExtensions.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/FunctionalityExposedForExtensions.java
@@ -23,6 +23,8 @@ package org.zkoss.ganttz;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
@@ -438,4 +440,17 @@ public class FunctionalityExposedForExtensions<T> implements IContext<T> {
 
     }
 
+    @Override
+    public List<Task> getTasksOrderedByStartDate() {
+        List<Task> tasks = diagramGraph.getTasks();
+        Collections.sort(tasks, new Comparator<Task>() {
+
+            @Override
+            public int compare(Task o1, Task o2) {
+                return o1.getBeginDate().compareTo(o2.getBeginDate());
+            }
+        });
+        return tasks;
+    }
+
 }
diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/extensions/ContextRelativeToOtherComponent.java b/ganttzk/src/main/java/org/zkoss/ganttz/extensions/ContextRelativeToOtherComponent.java
index 277e80666..56bbeb263 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/extensions/ContextRelativeToOtherComponent.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/extensions/ContextRelativeToOtherComponent.java
@@ -20,9 +20,12 @@
 
 package org.zkoss.ganttz.extensions;
 
+import java.util.List;
+
 import org.zkoss.ganttz.adapters.IDomainAndBeansMapper;
 import org.zkoss.ganttz.adapters.PlannerConfiguration;
 import org.zkoss.ganttz.data.Position;
+import org.zkoss.ganttz.data.Task;
 import org.zkoss.ganttz.timetracker.TimeTracker;
 import org.zkoss.zk.ui.Component;
 
@@ -107,4 +110,9 @@ public class ContextRelativeToOtherComponent<T> implements IContext<T> {
         context.reloadCharts();
     }
 
+    @Override
+    public List<Task> getTasksOrderedByStartDate() {
+        return context.getTasksOrderedByStartDate();
+    }
+
 }
diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/extensions/ContextWithPlannerTask.java b/ganttzk/src/main/java/org/zkoss/ganttz/extensions/ContextWithPlannerTask.java
index cf362ad98..bc57f842b 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/extensions/ContextWithPlannerTask.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/extensions/ContextWithPlannerTask.java
@@ -20,6 +20,8 @@
 
 package org.zkoss.ganttz.extensions;
 
+import java.util.List;
+
 import org.zkoss.ganttz.adapters.IDomainAndBeansMapper;
 import org.zkoss.ganttz.adapters.PlannerConfiguration;
 import org.zkoss.ganttz.data.Position;
@@ -110,4 +112,9 @@ public class ContextWithPlannerTask<T> implements IContextWithPlannerTask<T> {
         context.reloadCharts();
     }
 
+    @Override
+    public List<Task> getTasksOrderedByStartDate() {
+        return context.getTasksOrderedByStartDate();
+    }
+
 }
diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/extensions/IContext.java b/ganttzk/src/main/java/org/zkoss/ganttz/extensions/IContext.java
index 79ad3b631..37815ee9a 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/extensions/IContext.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/extensions/IContext.java
@@ -20,6 +20,8 @@
 
 package org.zkoss.ganttz.extensions;
 
+import java.util.List;
+
 import org.zkoss.ganttz.Planner;
 import org.zkoss.ganttz.TaskComponent;
 import org.zkoss.ganttz.adapters.IAdapterToTaskFundamentalProperties;
@@ -99,6 +101,8 @@ public interface IContext<T> {
 
     IDomainAndBeansMapper<T> getMapper();
 
+    public List<Task> getTasksOrderedByStartDate();
+
     /**
      * Recalculates the position of the task associated to domainObject.
      * @param domainObject