diff --git a/app.js b/app.js
index 0f94044..787ecd1 100644
--- a/app.js
+++ b/app.js
@@ -84,7 +84,7 @@ function getAllBlogPosts(page = 1, postsPerPage = 5) {
 
         // Get the last modified date of the markdown file
         const stats = fs.statSync(path.join(__dirname, 'markdown', file));
-        const dateCreated = new Date(stats.birthtime); // Use mtime for last modification time
+        const dateCreated = new Date(stats.birthtime); // Use birthtime for last modification time
 
         // Format the date
         const formattedDate = dateCreated.toLocaleDateString('en-US', {
@@ -218,8 +218,8 @@ app.get('/sitemap.xml', (req, res) => {
     const blogFiles = fs.readdirSync(path.join(__dirname, 'markdown'))
         .filter(file => file.endsWith('.md'))
         .sort((a, b) => {
-            const statA = fs.statSync(path.join(__dirname, 'markdown', a)).mtime;
-            const statB = fs.statSync(path.join(__dirname, 'markdown', b)).mtime;
+            const statA = fs.statSync(path.join(__dirname, 'markdown', a)).birthtime;
+            const statB = fs.statSync(path.join(__dirname, 'markdown', b)).birthtime;
             return statB - statA; // Sort in descending order (latest first)
         });
 
@@ -237,7 +237,7 @@ app.get('/sitemap.xml', (req, res) => {
 
         // Get the last modified date of the markdown file
         const stats = fs.statSync(path.join(__dirname, 'markdown', file));
-        const lastModifiedDate = format(new Date(stats.mtime), 'yyyy-MM-dd');
+        const lastModifiedDate = format(new Date(stats.birthtime), 'yyyy-MM-dd');
 
         return {
             url: `/blog/${slug}`,
@@ -276,8 +276,8 @@ app.get('/rss', (req, res) => {
     const blogFiles = fs.readdirSync(path.join(__dirname, 'markdown'))
         .filter(file => file.endsWith('.md'))
         .sort((a, b) => {
-            const statA = fs.statSync(path.join(__dirname, 'markdown', a)).mtime;
-            const statB = fs.statSync(path.join(__dirname, 'markdown', b)).mtime;
+            const statA = fs.statSync(path.join(__dirname, 'markdown', a)).birthtime;
+            const statB = fs.statSync(path.join(__dirname, 'markdown', b)).birthtime;
             return statB - statA; // Sort in descending order (latest first)
         });
 
@@ -294,7 +294,7 @@ app.get('/rss', (req, res) => {
 
         // Get the last modified date of the markdown file
         const stats = fs.statSync(path.join(__dirname, 'markdown', file));
-        const lastModifiedDate = new Date(stats.mtime).toUTCString(); // Use UTC date for RSS
+        const lastModifiedDate = new Date(stats.birthtime).toUTCString(); // Use UTC date for RSS
 
         // Load and parse markdown content to extract a lead or description
         const { lead } = loadMarkdownWithLead(file);