diff --git a/user_guide_src/source/outgoing/response/022.php b/user_guide_src/source/outgoing/response/022.php
index 5a841f28d2ce..62d7f65d07da 100644
--- a/user_guide_src/source/outgoing/response/022.php
+++ b/user_guide_src/source/outgoing/response/022.php
@@ -1,4 +1,4 @@
 <?php
 
 $response->setLastModified(date('D, d M Y H:i:s'));
-$response->setLastModified(DateTime::createFromFormat('u', $time));
+$response->setLastModified(DateTime::createFromFormat('U', $timestamp));