diff --git a/influxdb_api.py b/influxdb_api.py
index 7b24594..bd40879 100644
--- a/influxdb_api.py
+++ b/influxdb_api.py
@@ -1359,7 +1359,7 @@ def query_all_record_by_date(query_date: str, bucket: str="realtime_simulation_r
     # 构建 Flux 查询语句
     flux_query = f'''
     from(bucket: "{bucket}")
-      |> range(start: {str(start_time)})
+      |> range(start: {start_time})
       |> filter(fn: (r) => r["_measurement"] == "node" or r["_measurement"] == "link")
       |> filter(fn: (r) => r["date"] == "{query_date}")
       |> pivot(