diff --git a/app/Metadata.php b/app/Metadata.php
index ef80075..dc44009 100644
--- a/app/Metadata.php
+++ b/app/Metadata.php
@@ -12,4 +12,6 @@ class Metadata extends Model
 
     protected $fillable = ['url', 'title', 'description', 'image', 'expires_at'];
     protected $visible = ['url', 'title', 'description', 'image', 'expires_at'];
+
+    protected $dates = ['created_at', 'updated_at', 'expires_at'];
 }
diff --git a/routes/api.php b/routes/api.php
index db4aa59..37e9139 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -26,7 +26,7 @@ Route::get('/checkin/card', function (Request $request, MetadataResolver $resolv
     $url = $formatter->normalizeUrl($request->input('url'));
 
     $metadata = App\Metadata::find($url);
-    if ($metadata == null || ($metadata->expires_at !== null && new DateTime($metadata->expires_at) < new DateTime("now"))) {
+    if ($metadata == null || ($metadata->expires_at !== null && $metadata->expires_at < now())) {
         $resolved = $resolver->resolve($url);
         $metadata = App\Metadata::create([
             'url' => $url,