diff --git a/backend/utils/database.py b/backend/utils/database.py
index 1b375f1..cc18082 100644
--- a/backend/utils/database.py
+++ b/backend/utils/database.py
@@ -12,6 +12,19 @@
 import aiomysql
 from typing import Optional, Dict, Any, List
 from contextlib import asynccontextmanager
+from datetime import datetime, date
+
+def _convert_datetime(obj: Any) -> Any:
+    '''递归转换datetime对象为字符串'''
+    if isinstance(obj, datetime):
+        return obj.strftime('%Y-%m-%d %H:%M:%S')
+    elif isinstance(obj, date):
+        return obj.strftime('%Y-%m-%d')
+    elif isinstance(obj, dict):
+        return {k: _convert_datetime(v) for k, v in obj.items()}
+    elif isinstance(obj, list):
+        return [_convert_datetime(item) for item in obj]
+    return obj
 
 from config import settings
 from utils.logger import get_logger
@@ -88,14 +101,16 @@ async def execute_query(sql: str, params: tuple = None) -> List[Dict[str, Any]]:
     """执行查询SQL"""
     async with get_connection() as cursor:
         await cursor.execute(sql, params)
-        return await cursor.fetchall()
+        result = await cursor.fetchall()
+        return _convert_datetime(result)
 
 
 async def execute_one(sql: str, params: tuple = None) -> Optional[Dict[str, Any]]:
     """执行查询SQL（单条）"""
     async with get_connection() as cursor:
         await cursor.execute(sql, params)
-        return await cursor.fetchone()
+        result = await cursor.fetchone()
+        return _convert_datetime(result)
 
 
 async def execute_insert(sql: str, params: tuple = None) -> int:
diff --git a/frontend/index.php b/frontend/index.php
index 496920c..700f751 100644
--- a/frontend/index.php
+++ b/frontend/index.php
@@ -51,7 +51,10 @@ if (isset($_SESSION['user_id']) && isset($_SESSION['user_type'])) {
         </form>
         
         <div class="login-footer">
-            <p>&copy; <?php echo date('Y'); ?> Sea Network Technology Studio<?php if (defined('ICP_ENABLED') && ICP_ENABLED && defined('ICP_NUMBER') && ICP_NUMBER): ?> | <a href="https://beian.miit.gov.cn/" target="_blank" rel="noopener noreferrer"><?php echo htmlspecialchars(ICP_NUMBER); ?></a><?php endif; ?></p>
+            <p>&copy; <?php echo date('Y'); ?> Sea Network Technology Studio</p>
+            <?php if (defined('ICP_ENABLED') && ICP_ENABLED && defined('ICP_NUMBER') && ICP_NUMBER): ?>
+            <p><a href="https://beian.miit.gov.cn/" target="_blank" rel="noopener noreferrer"><?php echo htmlspecialchars(ICP_NUMBER); ?></a></p>
+            <?php endif; ?>
         </div>
     </div>