diff -u b/core/modules/system/system.admin.inc b/core/modules/system/system.admin.inc
--- b/core/modules/system/system.admin.inc
+++ b/core/modules/system/system.admin.inc
@@ -1962,7 +1962,7 @@
     drupal_set_message(t('Custom date format added.'));
   }
 
-  $form_state['redirect'] = 'admin/config/regional/date-time/formats';
+  $form_state['redirect'] = 'admin/config/regional/date-time';
 }
 
 /**
only in patch2:
unchanged:
--- a/core/modules/system/lib/Drupal/system/Tests/System/DateTimeTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/System/DateTimeTest.php
@@ -78,7 +78,7 @@ function testTimeZoneHandling() {
    */
   function testDateFormatConfiguration() {
     // Confirm 'no custom date formats available' message appears.
-    $this->drupalGet('admin/config/regional/date-time/formats');
+    $this->drupalGet('admin/config/regional/date-time');
 
     // Add custom date format.
     $this->clickLink(t('Add format'));
@@ -97,7 +97,7 @@ function testDateFormatConfiguration() {
     $this->assertText(t('Delete'), 'Delete link for custom date format appears.');
 
     // Edit custom date format.
-    $this->drupalGet('admin/config/regional/date-time/formats');
+    $this->drupalGet('admin/config/regional/date-time');
     $this->clickLink(t('Edit'));
     $edit = array(
       'date_format_pattern' => 'Y m',