diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java b/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java
index 6321eb29d..ea299a028 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java
@@ -24,11 +24,14 @@ package org.zkoss.ganttz;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.io.IOException;
+import java.util.Date;
 import java.util.Map;
 import java.util.UUID;
 
 import org.apache.commons.lang.Validate;
 import org.joda.time.DateTime;
+import org.joda.time.Days;
+import org.joda.time.Duration;
 import org.joda.time.LocalDate;
 import org.zkoss.ganttz.adapters.IDisabilityConfiguration;
 import org.zkoss.ganttz.data.GanttDate;
@@ -517,8 +520,34 @@ public class TaskComponent extends Div implements AfterCompose {
                 this.task.getHoursAdvanceEndDate()) + "px";
             response(null, new AuInvoke(this, "resizeCompletionAdvance",
                 widthHoursAdvancePercentage));
+
+            Date firstTimesheetDate = task.getFirstTimesheetDate();
+            Date lastTimesheetDate = task.getLastTimesheetDate();
+            if (firstTimesheetDate != null && lastTimesheetDate != null) {
+                Duration firstDuration = Days.daysBetween(
+                        task.getBeginDateAsLocalDate(),
+                        LocalDate.fromDateFields(firstTimesheetDate))
+                        .toStandardDuration();
+                int pixelsFirst = getMapper().toPixels(firstDuration);
+                String positionFirst = pixelsFirst + "px";
+
+                Duration lastDuration = Days
+                        .daysBetween(
+                                task.getBeginDateAsLocalDate(),
+                                LocalDate.fromDateFields(lastTimesheetDate)
+                                        .plusDays(1)).toStandardDuration();
+                int pixelsLast = getMapper().toPixels(lastDuration);
+                String positionLast = pixelsLast + "px";
+
+                response(null, new AuInvoke(this, "showTimsheetDateMarks",
+                        positionFirst, positionLast));
+            } else {
+                response(null, new AuInvoke(this, "hideTimsheetDateMarks"));
+            }
+
         } else {
             response(null, new AuInvoke(this, "resizeCompletionAdvance", "0px"));
+            response(null, new AuInvoke(this, "hideTimsheetDateMarks"));
         }
     }
 
diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/data/DefaultFundamentalProperties.java b/ganttzk/src/main/java/org/zkoss/ganttz/data/DefaultFundamentalProperties.java
index 65a7c4390..d0427cb50 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/data/DefaultFundamentalProperties.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/data/DefaultFundamentalProperties.java
@@ -313,4 +313,14 @@ public class DefaultFundamentalProperties implements ITaskFundamentalProperties
         return false;
     }
 
+    @Override
+    public Date getFirstTimesheetDate() {
+        return null;
+    }
+
+    @Override
+    public Date getLastTimesheetDate() {
+        return null;
+    }
+
 }
diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/data/ITaskFundamentalProperties.java b/ganttzk/src/main/java/org/zkoss/ganttz/data/ITaskFundamentalProperties.java
index 464b1f7ee..aa32e7e16 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/data/ITaskFundamentalProperties.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/data/ITaskFundamentalProperties.java
@@ -127,4 +127,8 @@ public interface ITaskFundamentalProperties {
 
     boolean isUpdatedFromTimesheets();
 
+    Date getFirstTimesheetDate();
+
+    Date getLastTimesheetDate();
+
 }
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 0e24683f0..7da3a7fa7 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java
@@ -553,4 +553,14 @@ public abstract class Task implements ITaskFundamentalProperties {
         return fundamentalProperties.isUpdatedFromTimesheets();
     }
 
+    @Override
+    public Date getFirstTimesheetDate() {
+        return fundamentalProperties.getFirstTimesheetDate();
+    }
+
+    @Override
+    public Date getLastTimesheetDate() {
+        return fundamentalProperties.getLastTimesheetDate();
+    }
+
 }
diff --git a/ganttzk/src/main/resources/web/js/ganttz/TaskComponent.js b/ganttzk/src/main/resources/web/js/ganttz/TaskComponent.js
index 86de72579..03e5203ab 100644
--- a/ganttzk/src/main/resources/web/js/ganttz/TaskComponent.js
+++ b/ganttzk/src/main/resources/web/js/ganttz/TaskComponent.js
@@ -221,6 +221,18 @@ ganttz.TaskComponent = zk.$extends(zul.Widget, {
     resizeCompletionAdvance : function(width){
         jq('#' + this.uuid + ' .completion:first').css('width', width);
     },
+    showTimsheetDateMarks : function(positionFirst, postionLast) {
+        var firstTimesheetDateMark = jq('#' + this.uuid + ' .first-timesheet-date');
+        var lastTimesheetDateMark = jq('#' + this.uuid + ' .last-timesheet-date');
+        firstTimesheetDateMark.css('left', positionFirst);
+        lastTimesheetDateMark.css('left', postionLast);
+        firstTimesheetDateMark.show();
+        lastTimesheetDateMark.show();
+    },
+    hideTimsheetDateMarks : function() {
+        jq('#' + this.uuid + ' .first-timesheet-date').hide();
+        jq('#' + this.uuid + ' .last-timesheet-date').hide();
+    },
     resizeCompletion2Advance : function(width){
         jq('#' + this.uuid + ' .completion2:first').css('width', width);
     },
diff --git a/ganttzk/src/main/resources/web/js/ganttz/mold/task-component.js b/ganttzk/src/main/resources/web/js/ganttz/mold/task-component.js
index 3685a791e..c4784599d 100644
--- a/ganttzk/src/main/resources/web/js/ganttz/mold/task-component.js
+++ b/ganttzk/src/main/resources/web/js/ganttz/mold/task-component.js
@@ -14,6 +14,8 @@ function(out){
         out.push('<div class="completionMoneyCostBar"></div>');
         out.push('<div class="completion"></div>');
         out.push('<div class="completion2"></div>');
+        out.push('<div class="timesheet-date-mark first-timesheet-date">|</div>');
+        out.push('<div class="timesheet-date-mark last-timesheet-date">|</div>');
 
         out.push('<div id="tasktooltip', this.uuid,'" class="task_tooltip">',
                 this.getTooltipText(),
diff --git a/libreplan-business/src/main/java/org/libreplan/business/orders/entities/OrderElement.java b/libreplan-business/src/main/java/org/libreplan/business/orders/entities/OrderElement.java
index e3f1ae11f..57e3a1f88 100644
--- a/libreplan-business/src/main/java/org/libreplan/business/orders/entities/OrderElement.java
+++ b/libreplan-business/src/main/java/org/libreplan/business/orders/entities/OrderElement.java
@@ -1616,4 +1616,18 @@ public abstract class OrderElement extends IntegrationEntity implements
         return taskElement.isUpdatedFromTimesheets();
     }
 
+    public Date getFirstTimesheetDate() {
+        if (sumChargedEffort == null) {
+            return null;
+        }
+        return sumChargedEffort.getFirstTimesheetDate();
+    }
+
+    public Date getLastTimesheetDate() {
+        if (sumChargedEffort == null) {
+            return null;
+        }
+        return sumChargedEffort.getLastTimesheetDate();
+    }
+
 }
diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/planner/TaskElementAdapter.java b/libreplan-webapp/src/main/java/org/libreplan/web/planner/TaskElementAdapter.java
index e83e03ec1..3462132c2 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/planner/TaskElementAdapter.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/planner/TaskElementAdapter.java
@@ -1228,6 +1228,24 @@ _(
                 return taskElement.isUpdatedFromTimesheets();
             }
 
+            @Override
+            public Date getFirstTimesheetDate() {
+                OrderElement orderElement = taskElement.getOrderElement();
+                if (orderElement != null) {
+                    return orderElement.getFirstTimesheetDate();
+                }
+                return null;
+            }
+
+            @Override
+            public Date getLastTimesheetDate() {
+                OrderElement orderElement = taskElement.getOrderElement();
+                if (orderElement != null) {
+                    return orderElement.getLastTimesheetDate();
+                }
+                return null;
+            }
+
         }
 
         @Override
diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/planner/adaptplanning/AdaptPlanningCommand.java b/libreplan-webapp/src/main/java/org/libreplan/web/planner/adaptplanning/AdaptPlanningCommand.java
index c9d688674..902bf4e19 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/planner/adaptplanning/AdaptPlanningCommand.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/planner/adaptplanning/AdaptPlanningCommand.java
@@ -92,10 +92,9 @@ public class AdaptPlanningCommand implements IAdaptPlanningCommand {
             taskElement.setUpdatedFromTimesheets(false);
 
             if (orderElement.hasTimesheetsReportingHours()) {
-                setStartDateAndConstraint(taskElement, orderElement
-                        .getSumChargedEffort().getFirstTimesheetDate());
-                Date lastTimesheetDate = orderElement.getSumChargedEffort()
-                        .getLastTimesheetDate();
+                setStartDateAndConstraint(taskElement,
+                        orderElement.getFirstTimesheetDate());
+                Date lastTimesheetDate = orderElement.getLastTimesheetDate();
                 setEndDateIfNeeded(taskElement, lastTimesheetDate);
 
                 if (orderElement.isFinishedTimesheets()) {
diff --git a/libreplan-webapp/src/main/webapp/planner/css/ganttzk.css b/libreplan-webapp/src/main/webapp/planner/css/ganttzk.css
index ff27669f8..a9aa526b4 100644
--- a/libreplan-webapp/src/main/webapp/planner/css/ganttzk.css
+++ b/libreplan-webapp/src/main/webapp/planner/css/ganttzk.css
@@ -274,6 +274,24 @@ div.box.limiting-unassigned {
     margin-top: 1px;
 }
 
+.timesheet-date-mark {
+    color: #F21CFF;
+    font-size: 8px;
+    font-weight: bold;
+    /* By default marks are hidden */
+    display: none;
+}
+
+.first-timesheet-date {
+    position: absolute;
+    margin-top: -19px;
+}
+
+.last-timesheet-date {
+    position: absolute;
+    margin-top: -19px;
+}
+
 .completion2 {
     width: 0%;
     height: 6px;