diff --git a/py-client/libs/state.py b/py-client/libs/state.py
index 89e82b2..11a3fce 100644
--- a/py-client/libs/state.py
+++ b/py-client/libs/state.py
@@ -198,7 +198,7 @@ class State:
         此接口不会标记成交。已有库存对应的卖出须先归档，再传入
         清仓快照，以免删除归档所需的库存。
         """
-        created_at = datetime.now().isoformat(timespec='seconds')
+        created_at = datetime.now().isoformat(sep=' ', timespec='seconds')
         holdings = {item.stock_code: item for item in positions if item.volume > 0}
         with closing(self._connect()) as db, db:
             db.execute('BEGIN IMMEDIATE')