diff --git a/module/story/model.php b/module/story/model.php
index b6c9d5c6e1..2d33a8c2ba 100644
--- a/module/story/model.php
+++ b/module/story/model.php
@@ -86,11 +86,11 @@ class storyModel extends model
         $story->children = array();
         if($story->parent == '-1') $story->children = $this->dao->select('*')->from(TABLE_STORY)->where('parent')->eq($storyID)->andWhere('deleted')->eq(0)->fetchAll('id');
 
-        $story->openedDate    = substr($story->openedDate, 0, 19);
-        $story->assignedDate  = substr($story->assignedDate, 0, 19);
-        $story->reviewedDate  = substr($story->reviewedDate, 0, 19);
-        $story->closedDate    = substr($story->closedDate, 0, 19);
-        $story->lastEditedDate= substr($story->lastEditedDate, 0, 19);
+        if($story->openedDate)     $story->openedDate    = substr($story->openedDate, 0, 19);
+        if($story->assignedDate)   $story->assignedDate  = substr($story->assignedDate, 0, 19);
+        if($story->reviewedDate)   $story->reviewedDate  = substr($story->reviewedDate, 0, 19);
+        if($story->closedDate)     $story->closedDate    = substr($story->closedDate, 0, 19);
+        if($story->lastEditedDate) $story->lastEditedDate= substr($story->lastEditedDate, 0, 19);
 
         return $story;
     }
diff --git a/module/task/model.php b/module/task/model.php
index 75fb9d6741..538713f28c 100755
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -2409,12 +2409,12 @@ class taskModel extends model
             ->andWhere('t1.vision')->eq($this->config->vision)
             ->fetch();
         if(!$task) return false;
-        $task->openedDate     = substr($task->openedDate, 0, 19);
-        $task->finishedDate   = substr($task->finishedDate, 0, 19);
-        $task->canceledDate   = substr($task->canceledDate, 0, 19);
-        $task->closedDate     = substr($task->closedDate, 0, 19);
-        $task->lastEditedDate = substr($task->lastEditedDate, 0, 19);
-        $task->realStarted    = substr($task->realStarted, 0, 19);
+        if($task->openedDate)     $task->openedDate     = substr($task->openedDate, 0, 19);
+        if($task->finishedDate)   $task->finishedDate   = substr($task->finishedDate, 0, 19);
+        if($task->canceledDate)   $task->canceledDate   = substr($task->canceledDate, 0, 19);
+        if($task->closedDate)     $task->closedDate     = substr($task->closedDate, 0, 19);
+        if($task->lastEditedDate) $task->lastEditedDate = substr($task->lastEditedDate, 0, 19);
+        if($task->realStarted)    $task->realStarted    = substr($task->realStarted, 0, 19);
 
         $children = $this->dao->select('*')->from(TABLE_TASK)->where('parent')->eq($taskID)->andWhere('deleted')->eq(0)->fetchAll('id');
         $task->children = $children;
diff --git a/module/testcase/model.php b/module/testcase/model.php
index 16f352a4b4..67a5fe8560 100644
--- a/module/testcase/model.php
+++ b/module/testcase/model.php
@@ -463,7 +463,7 @@ class testcaseModel extends model
     {
         $case = $this->dao->findById($caseID)->from(TABLE_CASE)->fetch();
         if(!$case) return false;
-        foreach($case as $key => $value) if(strpos($key, 'Date') !== false and !(int)substr($value, 0, 4)) $case->$key = '';
+        foreach($case as $key => $value) if(strpos($key, 'Date') !== false and helper::isZeroDate($value)) $case->$key = '';
 
         /* Get project and execution. */
         if($this->app->tab == 'project')
diff --git a/module/user/model.php b/module/user/model.php
index a59c30fd2f..c3d9efc59e 100644
--- a/module/user/model.php
+++ b/module/user/model.php
@@ -2712,7 +2712,10 @@ class userModel extends model
         $users = array();
 
         foreach(explode(',', trim($this->app->company->admins, ',')) as $admin) $users[$admin]   = $admin;
-        foreach(explode(',', trim($product->reviewer, ',')) as $account)        $users[$account] = $account;
+        if(!empty($product->reviewer))
+        {
+            foreach(explode(',', trim($product->reviewer, ',')) as $account)        $users[$account] = $account;
+        }
         if(isset($product->PMT))
         {
             foreach(explode(',', trim($product->PMT, ',')) as $account) $users[$account] = $account;