diff --git a/core/modules/system/lib/Drupal/system/Tests/Datetime/DrupalDateTimeTest.php b/core/modules/system/lib/Drupal/system/Tests/Datetime/DrupalDateTimeTest.php
index 94b7f55..d271269 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Datetime/DrupalDateTimeTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Datetime/DrupalDateTimeTest.php
@@ -115,12 +115,13 @@ public function testDateTimezone() {
    */
   function testFormatDate() {
     // Setup date/time settings for Honolulu time.
+    $config = config('system.timezone')
+      ->set('default', 'Pacific/Honolulu')
+      ->set('user.configurable', 0)
+      ->save();
     $config = config('system.date')
-      ->set('timezone.default','Pacific/Honolulu')
-      ->set('timezone.user.configurable',0)
       ->set('formats.medium.pattern.php', 'Y-m-d H:i:s O')
       ->save();
-
     // Create some nodes with different authored-on dates.
     $date1 = '2007-01-31 21:00:00 -1000';
     $date2 = '2007-07-31 21:00:00 -1000';