diff --git a/functions.php b/functions.php
index 5951c78..b003af6 100644
--- a/functions.php
+++ b/functions.php
@@ -17,6 +17,13 @@ function themeConfig($form) {
 
     $notification = new Typecho_Widget_Helper_Form_Element_Text('notification', NULL, NULL, _t('网站公告'), _t('显示在首页，留空则不显示'));
     $form->addInput($notification);
+
+    $oldPosts = new Typecho_Widget_Helper_Form_Element_Radio('oldPosts',
+        array('able' => _t('启用'),
+              'disable' => _t('禁用'),
+        ),
+        'disable', _t('是否显示旧文提示'), _t('启用则会在一年前发布的文章页面显示“这是一篇旧文”'));
+    $form->addInput($oldPosts);
 }
 
 function themeFields($layout) {
diff --git a/post.php b/post.php
index f8999b9..4cd6be1 100644
--- a/post.php
+++ b/post.php
@@ -18,6 +18,19 @@
             <?php endif;?>
         </div>
         <hr>
+        <?php
+            $date1=date_create(date('c',$this->date->timeStamp));
+            $date2=date_create(date('c'));
+            $days=date_diff($date1,$date2);
+        ?>
+        <?php if ($this->options->oldPosts == 'able' && $days->format('%a') > 365): ?>
+        <div class="alert alert-primary shadow mb-5" role="alert">
+            这是一篇发布于 <?php echo $days->format('%a'); ?> 天以前的旧文。其中的部分内容可能已经过时。
+            <button type="button" class="close" data-dismiss="alert" aria-label="Close">
+                <span aria-hidden="true" class="text-white">×</span>
+            </button>
+        </div>
+        <?php endif; ?>
         <div class="post-content" itemprop="articleBody">
             <?php $this->content(); ?>
         </div>