diff --git a/backend/instance/cookie_monitor.db b/backend/instance/cookie_monitor.db
index 94b3c04..636403e 100644
Binary files a/backend/instance/cookie_monitor.db and b/backend/instance/cookie_monitor.db differ
diff --git a/backend/routes/detections.py b/backend/routes/detections.py
index db12cce..8f439b5 100644
--- a/backend/routes/detections.py
+++ b/backend/routes/detections.py
@@ -70,6 +70,12 @@ def get_detection(detection_id):
 
 # 为Detection模型添加to_dict方法
 def detection_to_dict(self):
+    created_at = self.created_at
+    if created_at:
+        if created_at.tzinfo is None:
+            from datetime import timezone
+            created_at = created_at.replace(tzinfo=timezone.utc)
+        created_at = created_at.astimezone()
     return {
         'id': self.id,
         'website_id': self.website_id,
@@ -77,7 +83,7 @@ def detection_to_dict(self):
         'response_time': self.response_time,
         'http_status': self.http_status,
         'message': self.message,
-        'created_at': self.created_at.isoformat() if self.created_at else None
+        'created_at': created_at.isoformat() if created_at else None
     }
 
 Detection.to_dict = detection_to_dict