diff --git a/main.py b/main.py
index 3bf3715..8dcf7cb 100644
--- a/main.py
+++ b/main.py
@@ -19,7 +19,6 @@ from online_Analysis import *
 from fastapi.middleware.cors import CORSMiddleware
 from influxdb_client import InfluxDBClient, BucketsApi, WriteApi, OrganizationsApi, Point, QueryApi
 from typing import List, Dict
-import datetime
 from datetime import datetime, timedelta, timezone
 from dateutil import parser
 import influxdb_info
@@ -52,7 +51,7 @@ app = FastAPI()
 # 序列化处理器
 def encode_datetime(obj):
     """将datetime转换为可序列化的字典结构"""
-    if isinstance(obj, datetime.datetime):
+    if isinstance(obj, datetime):
         return {
             '__datetime__': True,
             'as_str': obj.strftime("%Y%m%dT%H:%M:%S.%f")
@@ -63,7 +62,7 @@ def encode_datetime(obj):
 def decode_datetime(obj):
     """将字典还原为datetime对象"""
     if '__datetime__' in obj:
-        return datetime.datetime.strptime(
+        return datetime.strptime(
             obj['as_str'], "%Y%m%dT%H:%M:%S.%f"
         )
     return obj