diff --git a/tests/system-test/2-query/To_iso8061.py b/tests/system-test/2-query/To_iso8061.py
new file mode 100644
index 0000000000..f569023459
--- /dev/null
+++ b/tests/system-test/2-query/To_iso8061.py
@@ -0,0 +1,75 @@
+from time import sleep
+import taos
+from util.log import *
+from util.sql import *
+from util.cases import *
+
+import os
+
+
+class TDTestCase:
+
+    def init(self, conn, logSql):
+        tdLog.debug(f"start to excute {__file__}")
+        tdSql.init(conn.cursor())
+
+    def run(self):  # sourcery skip: extract-duplicate-method
+        tdSql.prepare()
+        # get system timezone
+        today_date = datetime.datetime.strptime(
+            datetime.datetime.now().strftime("%Y-%m-%d"), "%Y-%m-%d")
+        
+        tdLog.printNoPrefix("==========step1:create tables==========")
+        tdSql.execute(
+            '''create table if not exists ntb
+            (ts timestamp, c1 int, c2 float,c3 double,c4 timestamp)
+            '''
+        )
+        tdSql.execute(
+            '''create table if not exists stb
+            (ts timestamp, c1 int, c2 float,c3 double,c4 timestamp) tags(t0 int)
+            '''
+        )
+        tdSql.execute(
+            '''create table if not exists stb_1 using stb tags(100)
+            '''
+        )
+
+        tdLog.printNoPrefix("==========step2:insert data==========")
+        tdSql.execute('insert into ntb values(now,1,1.55,100.555555,today())("2020-1-1 00:00:00",10,11.11,99.999999,now())(today(),3,3.333,333.333333,now())')
+        tdSql.execute('insert into stb_1 values(now,1,1.55,100.555555,today())("2020-1-1 00:00:00",10,11.11,99.999999,now())(today(),3,3.333,333.333333,now())')
+
+        tdSql.query("select to_iso8601(ts) from ntb")
+        tdSql.checkRows(3)
+        tdSql.query("select c1 from ntb where to_iso8601(ts)='2020-01-01T00:00:00.000+0800'")
+        tdSql.checkRows(1)
+        tdSql.checkData(0,0,10)
+        tdSql.query("select * from ntb where to_iso8601(ts)='2020-01-01T00:00:00.000+0800'")
+        tdSql.checkRows(1)
+        tdSql.query("select to_iso8601(ts) from ntb where ts=today()")
+        tdSql.checkRows(1)
+        # for i in range(1,30):
+        # tdSql.query("select to_iso8601(1) from ntb")
+        #     # tdSql.checkData(0,0,"1970-01-01T08:00:01+0800")
+        #     # i+=1
+        #     # sleep(0.5)
+        # tdSql.checkRows(3)
+        tdSql.query("select to_iso8601(ts) from ntb")
+        tdSql.checkRows(3)
+        
+        tdSql.query("select to_iso8601(today()) from ntb")
+        tdSql.checkRows(3)
+        tdSql.query("select to_iso8601(now()) from ntb")
+        tdSql.checkRows(3)
+        
+        tdSql.error("select to_iso8601(timezone()) from ntb")
+        tdSql.error("select to_iso8601('abc') from ntb")
+
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+tdCases.addLinux(__file__, TDTestCase())
+tdCases.addWindows(__file__, TDTestCase())
diff --git a/tests/system-test/2-query/timezone.py b/tests/system-test/2-query/timezone.py
index d0a6f4ef88..4470bfbf32 100644
--- a/tests/system-test/2-query/timezone.py
+++ b/tests/system-test/2-query/timezone.py
@@ -72,6 +72,7 @@ class TDTestCase:
 
         tdSql.query(f"select * from ntb where timezone()='{time_zone}'")
         tdSql.checkRows(2)
+        tdSql.error("select timezone()+1 from ntb")
 
     def stop(self):
         tdSql.close()