diff --git a/README.en.md b/README.en.md
index 9c5287f..4476b31 100644
--- a/README.en.md
+++ b/README.en.md
@@ -561,6 +561,17 @@ quicklink:
   ignores: [] # Ignore the specified link, only support string
 ```
 
+#### outdate warning (v0.2.4+)
+
+Disabled by default
+
+```yaml
+outdate:
+  enable: false
+  daysAgo: 180 # The number of days after which the article is considered outdated
+  message: 本文最后更新于 {time}，请注意文中内容可能已经发生变化。
+```
+
 </details>
 <details>
 <summary>Vendor</summary>
diff --git a/README.md b/README.md
index ca6f557..8adc345 100644
--- a/README.md
+++ b/README.md
@@ -559,6 +559,16 @@ content:
   license: # true | false 版权卡片展示协议？
 ```
 
+#### 过期提醒（v0.2.4+）
+
+默认关闭
+```yml
+outdate:
+  enable: false
+  daysAgo: 180 # 多少天前的文章算过期
+  message: 本文最后更新于 {time}，请注意文中内容可能已经发生变化。
+```
+
 </details>
 
 <details>
diff --git a/_config.yml b/_config.yml
index f06935e..6fc152a 100644
--- a/_config.yml
+++ b/_config.yml
@@ -278,6 +278,11 @@ live2d:
 
 reimu_cursor: true
 
+outdate:
+  enable: false
+  daysAgo: 180 # The number of days after which the article is considered outdated
+  message: 本文最后更新于 {time}，请注意文中内容可能已经发生变化。
+
 icon_font: 4552607_tq6stt6tcg
 
 # Dependent cdn links
diff --git a/layout/_partial/after-footer.ejs b/layout/_partial/after-footer.ejs
index e574061..008d423 100644
--- a/layout/_partial/after-footer.ejs
+++ b/layout/_partial/after-footer.ejs
@@ -334,6 +334,7 @@
 </div>
 
 <%- copyright() %>
+<%- outdate() %>
 
 <% if (theme.footer.busuanzi) { %>
   <%- js({src: vendorCdn(theme.vendor.js.busuanzi)[0], async: true}) %>
diff --git a/layout/_partial/article.ejs b/layout/_partial/article.ejs
index 0bcbe03..fdd1d74 100644
--- a/layout/_partial/article.ejs
+++ b/layout/_partial/article.ejs
@@ -7,6 +7,9 @@
     <div class="hr-line"></div>
     <%- partial('post/gallery') %>
     <div class="e-content article-entry" itemprop="articleBody">
+      <% if (theme.outdate.enable) { %>
+        <blockquote id="outdate-blockquote" style="display: none;"><p></p></blockquote>
+      <% } %>
       <% if (post.excerpt && index) { %>
         <%- post.excerpt %>
         <% if (theme.excerpt_link) { %>
diff --git a/layout/_partial/post/date.ejs b/layout/_partial/post/date.ejs
index 71f88e0..5417811 100644
--- a/layout/_partial/post/date.ejs
+++ b/layout/_partial/post/date.ejs
@@ -1,5 +1,6 @@
 <div class="<%= class_name %> wow slideInLeft">
   <a href="<%- url_for(post.path) %>" class="article-date-link">
     <time datetime="<%= date_xml(post.date) %>" itemprop="datePublished"><%= date(post.date, date_format) %></time>
+    <time style="display: none;" id="post-update-time"><%= date(post.updated, date_format) %></time>
   </a>
 </div>
diff --git a/scripts/helper/config.js b/scripts/helper/config.js
index 35f76c8..0a6b8cf 100644
--- a/scripts/helper/config.js
+++ b/scripts/helper/config.js
@@ -4,6 +4,7 @@ hexo.extend.helper.register("themeConfig", () => {
   const { config } = hexo.theme;
   const icon_font = config.icon_font;
   const clipboard_tips = config.clipboard;
+  const outdate = config.outdate;
   const _global = [];
   if (icon_font) {
     _global.push(`window.icon_font = '${icon_font}';`);
@@ -14,6 +15,9 @@ hexo.extend.helper.register("themeConfig", () => {
   if (config.service_worker.enable) {
     _global.push(`window.swPath = '${url_for.call(hexo, "/sw.js")}';`);
   }
+  if (outdate.enable) {
+    _global.push(`window.outdate = ${JSON.stringify(outdate)};`);
+  }
   return `
   <script>${_global.join("")}</script>
   `;
diff --git a/scripts/helper/outdate.js b/scripts/helper/outdate.js
new file mode 100644
index 0000000..adc1fd1
--- /dev/null
+++ b/scripts/helper/outdate.js
@@ -0,0 +1,26 @@
+hexo.extend.helper.register("outdate", () => {
+  const { config } = hexo.theme;
+  if (config.outdate?.enable) {
+    return `
+<script data-pjax>
+  var updateTime = _$('#post-update-time')?.innerHTML;
+
+  if (updateTime) {
+    const update = new Date(updateTime);
+    const now = new Date();
+    const diff = now - update;
+    const days = diff / 86400000;
+    const { daysAgo, message: template } = window.outdate;
+    if (days >= daysAgo) {
+      const message = template.replace(/{time}/, updateTime);
+      const blockquote = _$('#outdate-blockquote');
+      if (blockquote) {
+        blockquote.querySelector('p').innerText = message;
+        blockquote.style.display = 'block';
+      }
+    }
+  }
+</script>`;
+  }
+  return "";
+});
\ No newline at end of file