diff --git a/core/lib/Drupal/Core/Datetime/DateFormats.php b/core/lib/Drupal/Core/Datetime/DateFormats.php
index 18e6927..94e819b 100644
--- a/core/lib/Drupal/Core/Datetime/DateFormats.php
+++ b/core/lib/Drupal/Core/Datetime/DateFormats.php
@@ -10,6 +10,7 @@
 use Drupal\Component\Utility\Xss;
 use Drupal\Core\Config\ConfigFactory;
 use Drupal\Core\Datetime\DrupalDateTime;
+use Drupal\Core\Language\Language;
 
 /**
  * Provides a service to render date formats.
@@ -81,7 +82,7 @@ public function format($timestamp, $type = 'medium', $format = '', $timezone = N
     }
 
     if (empty($langcode)) {
-      $langcode = language(LANGUAGE_TYPE_INTERFACE)->langcode;
+      $langcode = language(Language::TYPE_INTERFACE)->langcode;
     }
 
     // Create a DrupalDateTime object from the timestamp and timezone.