diff --git a/app/views/courses/show.html.erb b/app/views/courses/show.html.erb
index 5a440aff..69abf7ff 100644
--- a/app/views/courses/show.html.erb
+++ b/app/views/courses/show.html.erb
@@ -63,7 +63,7 @@
                           <td > <%= link_to (h @user.try(:name)), user_path(@user) if @user %> <%= l(:label_user_create_project) %> <%= link_to @course.name %><strong> !</strong></td>
                         </tr>
                         <tr>
-                          <td class="font_lighter" style="float: right"><%= l :label_update_time %>: <%= format_time(@course.created_on) %>
+                          <td class="font_lighter" style="float: right"><%= l :label_update_time %>: <%= format_time(@course.created_at) %>
                       </table></td>
                   </tr>
                 </table>