diff --git a/door_pi_control/nfc.py b/door_pi_control/nfc.py
index 3652927..ad60270 100644
--- a/door_pi_control/nfc.py
+++ b/door_pi_control/nfc.py
@@ -1,6 +1,7 @@
 import select
 import socket
 import time
+import datetime
 from threading import Lock, RLock, Condition, Thread
 from typing import Callable, Optional, IO, Container