diff --git a/app/sitemap.ts b/app/sitemap.ts
index 3b57015..6721a59 100644
--- a/app/sitemap.ts
+++ b/app/sitemap.ts
@@ -1,17 +1,16 @@
 import { allPosts } from "content-collections";
+import dayjs from "dayjs";
 import type { MetadataRoute } from "next";
 
 const sitemap = (): MetadataRoute.Sitemap => {
   const posts = allPosts.map((post) => ({
     url: `https://akhilaariyachandra.com/blog/${post._meta.path}`,
-    lastModified: post.updated
-      ? post.updated.split("T")[0]
-      : post.posted.split("T")[0],
+    lastModified: dayjs(post.updated ?? post.posted).format("YYYY-MM-DD"),
   }));
 
   const routes = ["", "/blog"].map((route) => ({
     url: `https://akhilaariyachandra.com${route}`,
-    lastModified: new Date().toISOString().split("T")[0],
+    lastModified: dayjs().format("YYYY-MM-DD"),
   }));
 
   return [...routes, ...posts];