diff --git a/db/contacts_db.py b/db/contacts_db.py
index 00cb910..5e57aca 100644
--- a/db/contacts_db.py
+++ b/db/contacts_db.py
@@ -3,6 +3,7 @@
 微信联系人数据库操作类
 用于管理微信联系人信息的存储和查询
 """
+from datetime import datetime
 
 from loguru import logger
 import json
@@ -615,6 +616,11 @@ class ContactsDBOperator(BaseDBOperator):
         try:
             sql = "SELECT wxid,nick_name,display_name,status,latest_active_time FROM t_chatroom_member WHERE chatroom_id = %s"
             results = self.execute_query(sql, (chatroom_id,))
+
+            for row in results:
+                dt = row.get("latest_active_time")
+                if isinstance(dt, datetime):
+                    row["latest_active_time"] = dt.strftime("%Y-%m-%d %H:%M:%S")
             return results
         except Exception as e:
             self.LOG.error(f"获取群{chatroom_id}成员列表失败: {e}")