diff --git a/module/productplan/js/create.js b/module/productplan/js/create.js
index f6fb3e20cd..0dd9d55ca3 100644
--- a/module/productplan/js/create.js
+++ b/module/productplan/js/create.js
@@ -29,3 +29,22 @@ function computeEndDate(delta)
     endDate = endDate.toString('yyyy-M-dd');
     $('#end').val(endDate);
 }
+
+/**
+ * when begin date input change and end date input is null
+ * change end date input to begin's after day
+ * 
+ * @access public
+ * @return void
+ */
+function suitEndDate()
+{
+    beginDate = $('#begin').val();
+    if(!beginDate) return;
+    endDate = $('#end').val();
+    if(endDate) return;
+    
+    endDate = convertStringToDate(beginDate).addDays(1);
+    endDate = endDate.toString('yyyy-M-dd');
+    $('#end').val(endDate);
+}
diff --git a/module/productplan/view/create.html.php b/module/productplan/view/create.html.php
index 8cd3babdea..26b2a117e1 100644
--- a/module/productplan/view/create.html.php
+++ b/module/productplan/view/create.html.php
@@ -33,7 +33,7 @@
       </tr>
       <tr>
         <th><?php echo $lang->productplan->begin;?></th>
-        <td><?php echo html::input('begin', $begin, "class='form-control form-date'");?></td>
+        <td><?php echo html::input('begin', $begin, "class='form-control form-date' onchange='suitEndDate()'");?></td>
       </tr>
       <tr>
         <th><?php echo $lang->productplan->end;?></th>
diff --git a/module/testtask/js/create.js b/module/testtask/js/create.js
index 4ce4791007..65e23bc605 100755
--- a/module/testtask/js/create.js
+++ b/module/testtask/js/create.js
@@ -25,3 +25,36 @@ function loadProjectBuilds(projectID)
     $('#buildBox').load(link);
 }
 
+/**
+ * Convert a date string like 2011-11-11 to date object in js.
+ * 
+ * @param  string $date 
+ * @access public
+ * @return date
+ */
+function convertStringToDate(dateString)
+{
+    dateString = dateString.split('-');
+    dateString = dateString[1] + '/' + dateString[2] + '/' + dateString[0];
+    
+    return Date.parse(dateString);
+}
+
+/**
+ * when begin date input change and end date input is null
+ * change end date input to begin's after day
+ * 
+ * @access public
+ * @return void
+ */
+function suitEndDate()
+{
+    beginDate = $('#begin').val();
+    if(!beginDate) return;
+    endDate = $('#end').val();
+    if(endDate) return;
+    
+    endDate = convertStringToDate(beginDate).addDays(1);
+    endDate = endDate.toString('yyyy-M-dd');
+    $('#end').val(endDate);
+}
diff --git a/module/testtask/view/create.html.php b/module/testtask/view/create.html.php
index 1c207d67e4..aae49f1b82 100644
--- a/module/testtask/view/create.html.php
+++ b/module/testtask/view/create.html.php
@@ -13,6 +13,7 @@
 <?php include '../../common/view/header.html.php';?>
 <?php include '../../common/view/datepicker.html.php';?>
 <?php include '../../common/view/kindeditor.html.php';?>
+<?php js::import($jsRoot . 'misc/date.js');?>
 <div class='container'>
   <div id='titlebar'>
     <div class='heading'>
@@ -51,7 +52,7 @@
       </tr>  
       <tr>
         <th><?php echo $lang->testtask->begin;?></th>
-        <td><?php echo html::input('begin', '', "class='form-control form-date'");?></td>
+        <td><?php echo html::input('begin', '', "class='form-control form-date' onchange='suitEndDate()'");?></td>
       </tr>  
       <tr>
         <th><?php echo $lang->testtask->end;?></th>