diff --git a/main.py b/main.py
index 323b982..4461b96 100644
--- a/main.py
+++ b/main.py
@@ -2728,7 +2728,7 @@ def generate_openapi_json():
 
 # DingZQ, 2025-05-17
 @app.get("/runsimulationbydate/", response_class = PlainTextResponse)
-async def fastapi_run_project_by_date(network: str, querydate: str) -> str:
+async def fastapi_run_project_by_date(network: str, querydate: str) -> bool:
     filename = 'c:/lock.simulation'
     filename2 = 'c:/lock.simulation2'
     if os.path.exists(filename2):
@@ -2744,8 +2744,8 @@ async def fastapi_run_project_by_date(network: str, querydate: str) -> str:
         bg_start_time_str = bg_start_time.isoformat()
         print(f"bg_start_time_str: {bg_start_time_str}")
 
-        result = simulation.run_simulation(name=network, simulation_type='realtime', modify_pattern_start_time=bg_start_time_str, modify_total_duration=86400)
-        return result
+        simulation.run_simulation(name=network, simulation_type='realtime', modify_pattern_start_time=bg_start_time_str, modify_total_duration=86400)
+        return True