diff --git a/tests/pytest/query/operator_cost.py b/tests/pytest/query/operator_cost.py
index 774a1e5f42403a6b5f67678e53be5e07beaccde2..f22cfcd4ec709b1d4440065fab398979afeb3adc 100644
--- a/tests/pytest/query/operator_cost.py
+++ b/tests/pytest/query/operator_cost.py
@@ -25,7 +25,8 @@ class TDTestCase:
         tdLog.debug("start to execute %s" % __file__)
         tdSql.init(conn.cursor(), logSql)
 
-        self.ts = 1600000000000
+        now = time.time()
+        self.ts = int(round(now * 1000))
         self.num = 10
 
     def run(self):