diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java b/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java
index 9bfecc52f..215497fa3 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java
@@ -548,4 +548,11 @@ public abstract class Task implements ITaskFundamentalProperties {
                 getBeginDate());
     }
 
+    public void firePropertyChangeForTaskDates() {
+        fundamentalPropertiesListeners.firePropertyChange("beginDate", null,
+                getBeginDate());
+        fundamentalPropertiesListeners.firePropertyChange("endDate", null,
+                getEndDate());
+    }
+
 }
diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/planner/taskedition/EditTaskController.java b/libreplan-webapp/src/main/java/org/libreplan/web/planner/taskedition/EditTaskController.java
index a522cef58..ab4ac296b 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/planner/taskedition/EditTaskController.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/planner/taskedition/EditTaskController.java
@@ -316,6 +316,10 @@ public class EditTaskController extends GenericForwardComposer {
             if (context.getRelativeTo() instanceof TaskComponent) {
                 ((TaskComponent) context.getRelativeTo()).updateProperties();
                 ((TaskComponent) context.getRelativeTo()).invalidate();
+
+                org.zkoss.ganttz.data.Task task = context.getMapper()
+                        .findAssociatedBean(taskElement);
+                task.firePropertyChangeForTaskDates();
             }
         }
     }