diff --git a/tests/system-test/2-query/Now.py b/tests/system-test/2-query/Now.py
index 7f0e17343996c709a44fbf84c7b2d0694dc67f90..7ad8a22720aa9e7890328b9669a6fa7d6db76bdd 100644
--- a/tests/system-test/2-query/Now.py
+++ b/tests/system-test/2-query/Now.py
@@ -122,6 +122,17 @@ class TDTestCase:
         tdSql.checkRows(0)
         tdSql.query("select now() from ntb where ts=today()")
         tdSql.checkRows(1)
+        tdSql.query("select now()+1 from ntb")
+        tdSql.checkRows(3)
+        tdSql.query("select now()+9223372036854775807 from ntb")
+        tdSql.checkRows(3)
+        tdSql.query("select now()+1.5 from ntb")
+        tdSql.checkRows(3)
+
+
+        tdSql.error("select now()+'abc' from ntb")
+        tdSql.error("select now()+abc from ntb")
+        
 
         # stable
         tdSql.query("select now() from stb")
diff --git a/tests/system-test/2-query/timezone.py b/tests/system-test/2-query/timezone.py
index a273b1c0f8ba10936cd1adf29f490979604fc8c5..36045fac5e3571aa1441dc3fd6b351420dbd74fa 100644
--- a/tests/system-test/2-query/timezone.py
+++ b/tests/system-test/2-query/timezone.py
@@ -73,6 +73,7 @@ class TDTestCase:
         tdSql.checkRows(2)
         tdSql.query("select timezone()+1 from ntb")
         tdSql.checkRows(2)
+        tdSql.query("select timezone()+1.5 from ntb")
 
     def stop(self):
         tdSql.close()