diff --git a/backend/app/api/duty.py b/backend/app/api/duty.py
index c60fc41fa..a89bfd817 100644
--- a/backend/app/api/duty.py
+++ b/backend/app/api/duty.py
@@ -1,7 +1,7 @@
 """值班排班 · 管理端 API"""
 from __future__ import annotations
 
-from datetime import date, datetime
+from datetime import datetime
 from typing import Optional
 
 from fastapi import APIRouter, Depends, Query