diff --git a/build.js b/build.js
index cf0b985..be73b5d 100644
--- a/build.js
+++ b/build.js
@@ -3,6 +3,6 @@ const fs = require("fs");
 let file = fs.readFileSync("index.html", "utf-8");
 file = file.replace(
   '<span class="last-updated"></span>',
-  new Date().toString(),
+  new Date().toUTCString(),
 );
 fs.writeFileSync("index.html", file);