src/Controller/HomeController.php

@@ -3,6 +3,7 @@
 namespace App\Controller;
 
 use App\Form\UserNameFormType;
+use DateTimeImmutable;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\HttpFoundation\Cookie;
 use Symfony\Component\HttpFoundation\RedirectResponse;
@@ -33,7 +34,13 @@ final class HomeController extends AbstractController
                 $response->headers->clearCookie('username');
                 return $response;
             }
-            $response->headers->setCookie(new Cookie('username', $username));
+            $response->headers->setCookie(
+                new Cookie(
+                    name: 'username',
+                    value: $username,
+                    expire: new DateTimeImmutable('+1 year'),
+                )
+            );
             return $response;
         }
         $username = $request->cookies->get('username', self::DEFAULT_USERNAME);