diff --git a/superset/db_engine_specs/presto.py b/superset/db_engine_specs/presto.py
index 8fa4d2794a31..9a72b7608165 100644
--- a/superset/db_engine_specs/presto.py
+++ b/superset/db_engine_specs/presto.py
@@ -761,7 +761,7 @@ def convert_dttm(
             utils.TemporalType.TIMESTAMP,
             utils.TemporalType.TIMESTAMP_WITH_TIME_ZONE,
         ):
-            return f"""TIMESTAMP '{dttm.isoformat(timespec="microseconds")}'"""
+            return f"""TIMESTAMP '{dttm.isoformat(timespec="microseconds", sep=" ")}'"""
         return None
 
     @classmethod
diff --git a/superset/db_engine_specs/trino.py b/superset/db_engine_specs/trino.py
index f9d06bb9c6a7..9941c57d985b 100644
--- a/superset/db_engine_specs/trino.py
+++ b/superset/db_engine_specs/trino.py
@@ -76,7 +76,7 @@ def convert_dttm(
             utils.TemporalType.TIMESTAMP,
             utils.TemporalType.TIMESTAMP_WITH_TIME_ZONE,
         ):
-            return f"""TIMESTAMP '{dttm.isoformat(timespec="microseconds")}'"""
+            return f"""TIMESTAMP '{dttm.isoformat(timespec="microseconds", sep=" ")}'"""
         return None
 
     @classmethod
diff --git a/tests/integration_tests/db_engine_specs/presto_tests.py b/tests/integration_tests/db_engine_specs/presto_tests.py
index acb9922d4563..954f8d660a97 100644
--- a/tests/integration_tests/db_engine_specs/presto_tests.py
+++ b/tests/integration_tests/db_engine_specs/presto_tests.py
@@ -512,19 +512,6 @@ def test_presto_where_latest_partition(self):
         query_result = str(result.compile(compile_kwargs={"literal_binds": True}))
         self.assertEqual("SELECT  \nWHERE ds = '01-01-19' AND hour = 1", query_result)
 
-    def test_convert_dttm(self):
-        dttm = self.get_dttm()
-
-        self.assertEqual(
-            PrestoEngineSpec.convert_dttm("DATE", dttm),
-            "DATE '2019-01-02'",
-        )
-
-        self.assertEqual(
-            PrestoEngineSpec.convert_dttm("TIMESTAMP", dttm),
-            "TIMESTAMP '2019-01-02T03:04:05.678900'",
-        )
-
     def test_query_cost_formatter(self):
         raw_cost = [
             {
diff --git a/tests/integration_tests/db_engine_specs/trino_tests.py b/tests/integration_tests/db_engine_specs/trino_tests.py
index 18f00b8988c4..b2235ae0c726 100644
--- a/tests/integration_tests/db_engine_specs/trino_tests.py
+++ b/tests/integration_tests/db_engine_specs/trino_tests.py
@@ -27,19 +27,6 @@
 
 
 class TestTrinoDbEngineSpec(TestDbEngineSpec):
-    def test_convert_dttm(self):
-        dttm = self.get_dttm()
-
-        self.assertEqual(
-            TrinoEngineSpec.convert_dttm("DATE", dttm),
-            "DATE '2019-01-02'",
-        )
-
-        self.assertEqual(
-            TrinoEngineSpec.convert_dttm("TIMESTAMP", dttm),
-            "TIMESTAMP '2019-01-02T03:04:05.678900'",
-        )
-
     def test_adjust_database_uri(self):
         url = URL(drivername="trino", database="hive")
         TrinoEngineSpec.adjust_database_uri(url, selected_schema="foobar")
diff --git a/tests/unit_tests/db_engine_specs/test_presto.py b/tests/unit_tests/db_engine_specs/test_presto.py
index 5bb327ff4ebc..512d03096b0b 100644
--- a/tests/unit_tests/db_engine_specs/test_presto.py
+++ b/tests/unit_tests/db_engine_specs/test_presto.py
@@ -30,17 +30,17 @@
         (
             "TIMESTAMP",
             datetime(2022, 1, 1, 1, 23, 45, 600000),
-            "TIMESTAMP '2022-01-01T01:23:45.600000'",
+            "TIMESTAMP '2022-01-01 01:23:45.600000'",
         ),
         (
             "TIMESTAMP WITH TIME ZONE",
             datetime(2022, 1, 1, 1, 23, 45, 600000),
-            "TIMESTAMP '2022-01-01T01:23:45.600000'",
+            "TIMESTAMP '2022-01-01 01:23:45.600000'",
         ),
         (
             "TIMESTAMP WITH TIME ZONE",
             datetime(2022, 1, 1, 1, 23, 45, 600000, tzinfo=pytz.UTC),
-            "TIMESTAMP '2022-01-01T01:23:45.600000+00:00'",
+            "TIMESTAMP '2022-01-01 01:23:45.600000+00:00'",
         ),
     ],
 )
diff --git a/tests/unit_tests/db_engine_specs/test_trino.py b/tests/unit_tests/db_engine_specs/test_trino.py
index 1e800f3ad6db..692fe875da0e 100644
--- a/tests/unit_tests/db_engine_specs/test_trino.py
+++ b/tests/unit_tests/db_engine_specs/test_trino.py
@@ -30,17 +30,17 @@
         (
             "TIMESTAMP",
             datetime(2022, 1, 1, 1, 23, 45, 600000),
-            "TIMESTAMP '2022-01-01T01:23:45.600000'",
+            "TIMESTAMP '2022-01-01 01:23:45.600000'",
         ),
         (
             "TIMESTAMP WITH TIME ZONE",
             datetime(2022, 1, 1, 1, 23, 45, 600000),
-            "TIMESTAMP '2022-01-01T01:23:45.600000'",
+            "TIMESTAMP '2022-01-01 01:23:45.600000'",
         ),
         (
             "TIMESTAMP WITH TIME ZONE",
             datetime(2022, 1, 1, 1, 23, 45, 600000, tzinfo=pytz.UTC),
-            "TIMESTAMP '2022-01-01T01:23:45.600000+00:00'",
+            "TIMESTAMP '2022-01-01 01:23:45.600000+00:00'",
         ),
     ],
 )