diff --git a/config.py b/config.py
index 51f7777..89191e4 100644
--- a/config.py
+++ b/config.py
@@ -76,7 +76,7 @@ POSITIONS_FILE = "positions.json"
 
 # Cost basis sync
 COST_TRACKING_FILE = "cost_tracking.json"
-INIT_COST_BASIS_START_MS = 1773244800000  # 2026-03-11 00:00:00 +08:00
+INIT_COST_BASIS_START_MS = 1773100800000  # 2026-03-10 00:00:00 UTC
 
 # Schedule
 RUN_INTERVAL_MINUTES = 5