diff --git a/takway/clients/client_utils.py b/takway/clients/client_utils.py
index ef444f2..84d2cb2 100644
--- a/takway/clients/client_utils.py
+++ b/takway/clients/client_utils.py
@@ -1,7 +1,7 @@
 import os
 import json
 import time
-import datetime
+from datetime import datetime
 import requests
 import struct
 from takway.common_utils import encode_bytes2str, decode_str2bytes