diff --git a/src/entry.js b/src/entry.js
index 5b4caf6..8ef096a 100644
--- a/src/entry.js
+++ b/src/entry.js
@@ -112,7 +112,7 @@ function extractTokenFromQuery(url) {
 
 // Generate ISO timestamp string
 function nowString() {
-  return new Date().toISOString().replace("T", " ").replace("Z", "");
+  return new Date().toISOString();
 }
 
 // Helper to get env var with fallback
diff --git a/src/handlers/attachments.rs b/src/handlers/attachments.rs
index 7aa6135..af20102 100644
--- a/src/handlers/attachments.rs
+++ b/src/handlers/attachments.rs
@@ -88,7 +88,7 @@ impl NumberOrString {
 }
 
 async fn touch_cipher_updated_at(db: &D1Database, cipher_id: &str) -> Result<(), AppError> {
-    let now = Utc::now().format("%Y-%m-%dT%H:%M:%S%.3fZ").to_string();
+    let now = now_string();
     query!(
         db,
         "UPDATE ciphers SET updated_at = ?1 WHERE id = ?2",