diff --git a/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
index acee21c9a34b3d0cc5a0d30da443526ad61e6f66..bee69a151c4a1d38f5801bd2c7c5ac81371475ad 100644
--- a/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
@@ -269,7 +269,7 @@ protected function setCacheControlNoCache(Response $response) {
    *   A response object.
    */
   protected function setExpiresNoCache(Response $response) {
-    $response->setExpires(\DateTime::createFromFormat('j-M-Y H:i:s T', '19-Nov-1978 05:00:00 GMT'));
+    $response->setExpires(\DateTime::createFromFormat('j-M-Y H:i:s T', '19-Nov-1978 05:00:00 UTC'));
   }
 
   /**