diff --git a/lib/routes/github/issue.js b/lib/routes/github/issue.js
index 57f41a0f08..78f8d7ff5c 100644
--- a/lib/routes/github/issue.js
+++ b/lib/routes/github/issue.js
@@ -29,7 +29,7 @@ module.exports = async (ctx) => {
             .map((item) => ({
                 title: item.title,
                 description: md.render(item.body) || 'No description',
-                pubDate: new Date(item.created_at),
+                pubDate: new Date(item.created_at).toUTCString(),
                 link: `${host}/${item.number}`,
             })),
     };