diff --git a/module/projectrelease/control.php b/module/projectrelease/control.php
index 84472eceb9..0b9e74304b 100644
--- a/module/projectrelease/control.php
+++ b/module/projectrelease/control.php
@@ -495,8 +495,8 @@ class projectrelease extends control
      */
     public function batchUnlinkStory($releaseID)
     {
-        $this->projectrelease->batchUnlinkStory($releaseID);
-        die(js::locate($this->createLink('release', 'view', "releaseID=$releaseID&type=story"), 'parent'));
+        $this->loadModel('release')->batchUnlinkStory($releaseID);
+        die(js::locate($this->createLink('projectrelease', 'view', "releaseID=$releaseID&type=story"), 'parent'));
     }
 
     /**
@@ -626,8 +626,8 @@ class projectrelease extends control
      */
     public function batchUnlinkBug($releaseID, $type = 'bug')
     {
-        $this->projectrelease->batchUnlinkBug($releaseID, $type);
-        die(js::locate($this->createLink('release', 'view', "releaseID=$releaseID&type=$type"), 'parent'));
+        $this->loadModel('release')->batchUnlinkBug($releaseID, $type);
+        die(js::locate($this->createLink('projectrelease', 'view', "releaseID=$releaseID&type=$type"), 'parent'));
     }
 
     /**
diff --git a/module/projectrelease/model.php b/module/projectrelease/model.php
index 25fb125d56..764f567503 100644
--- a/module/projectrelease/model.php
+++ b/module/projectrelease/model.php
@@ -292,28 +292,6 @@ class projectreleaseModel extends model
         $this->loadModel('action')->create('story', $storyID, 'unlinkedfromrelease', '', $releaseID);
     }
 
-    /**
-     * Batch unlink story.
-     * 
-     * @param  int    $releaseID 
-     * @access public
-     * @return void
-     */
-    public function batchUnlinkStory($releaseID)
-    {
-        $storyList = $this->post->storyIdList;
-        if(empty($storyList)) return true;
-
-        $release = $this->getByID($releaseID);
-        $release->stories = ",$release->stories,";
-        foreach($storyList as $storyID) $release->stories = str_replace(",$storyID,", ',', $release->stories);
-        $release->stories = trim($release->stories, ',');
-        $this->dao->update(TABLE_RELEASE)->set('stories')->eq($release->stories)->where('id')->eq((int)$releaseID)->exec();
-
-        $this->loadModel('action');
-        foreach($this->post->storyIdList as $unlinkStoryID) $this->action->create('story', $unlinkStoryID, 'unlinkedfromrelease', '', $releaseID);
-    }
-
     /**
      * Link bugs.
      * 
@@ -358,31 +336,6 @@ class projectreleaseModel extends model
         $this->loadModel('action')->create('bug', $bugID, 'unlinkedfromrelease', '', $releaseID);
     }
 
-    /**
-     * Batch unlink bug.
-     * 
-     * @param  int    $releaseID 
-     * @param  string $type 
-     * @access public
-     * @return void
-     */
-    public function batchUnlinkBug($releaseID, $type = 'bug')
-    {
-
-        $bugList = $this->post->unlinkBugs;
-        if(empty($bugList)) return true;
-
-        $release = $this->getByID($releaseID);
-        $field   = $type == 'bug' ? 'bugs' : 'leftBugs';
-        $release->$field = ",{$release->$field},";
-        foreach($bugList as $bugID) $release->$field = str_replace(",$bugID,", ',', $release->$field);
-        $release->$field = trim($release->$field, ',');
-        $this->dao->update(TABLE_RELEASE)->set($field)->eq($release->$field)->where('id')->eq((int)$releaseID)->exec();
-
-        $this->loadModel('action');
-        foreach($this->post->unlinkBugs as $unlinkBugID) $this->action->create('bug', $unlinkBugID, 'unlinkedfromrelease', '', $releaseID);
-    }
-
     /**
      * Change status.
      * 
diff --git a/module/release/model.php b/module/release/model.php
index ab21ea820c..89f0562ac3 100644
--- a/module/release/model.php
+++ b/module/release/model.php
@@ -360,7 +360,6 @@ class releaseModel extends model
      */
     public function batchUnlinkBug($releaseID, $type = 'bug')
     {
-
         $bugList = $this->post->unlinkBugs;
         if(empty($bugList)) return true;
 
diff --git a/module/task/model.php b/module/task/model.php
index ea93fd4fdc..8958a2cc6e 100644
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -1040,6 +1040,8 @@ class taskModel extends model
             if($data->finishedBys[$taskID] == 'ditto') $data->finishedBys[$taskID] = isset($prev['finishedBy']) ? $prev['finishedBy'] : '';
             if($data->canceledBys[$taskID] == 'ditto') $data->canceledBys[$taskID] = isset($prev['canceledBy']) ? $prev['canceledBy'] : '';
             if($data->closedBys[$taskID]   == 'ditto') $data->closedBys[$taskID]   = isset($prev['closedBy'])   ? $prev['closedBy']   : '';
+            if($data->estStarteds[$taskID] == '0000-00-00') $data->estStarteds[$taskID] = '';
+            if($data->deadlines[$taskID]   == '0000-00-00') $data->deadlines[$taskID]   = '';
 
             $prev['module']     = $data->modules[$taskID];
             $prev['type']       = $data->types[$taskID];
diff --git a/zdata/create.php b/zdata/create.php
index ed262e003b..a2b06da6d2 100644
--- a/zdata/create.php
+++ b/zdata/create.php
@@ -48,6 +48,7 @@ try
 
     $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // 设置报错处理方式。
     $dbh->exec("SET GLOBAL sql_mode = '';");
+    $dbh->exec("set names 'utf8'");
     $dbh->beginTransaction();
 
     foreach($sqlFilePath as $file)