diff --git a/routes/web.php b/routes/web.php
index b86573620d..55fa1c3fd3 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -22,7 +22,7 @@
 declare(strict_types=1);
 
 if(!defined('DATEFORMAT')) {
-    const DATEFORMAT = '(19|20)[0-9]{2}-[0-9]{2}-[0-9]{2}';
+    define('DATEFORMAT', '(19|20)[0-9]{2}-[0-9]{2}-[0-9]{2}');
 }
 
 Route::group(