diff --git a/apps/dot_ext/tests/test_authorization.py b/apps/dot_ext/tests/test_authorization.py
index e159074c1..c60fdf111 100644
--- a/apps/dot_ext/tests/test_authorization.py
+++ b/apps/dot_ext/tests/test_authorization.py
@@ -575,7 +575,7 @@ def test_dag_expiration_exists(self):
         c = Client()
         response = c.post('/v1/o/token/', data=token_request_data)
         tkn = response.json()
-        expiration_date_string = strftime('%Y-%m-%d %H:%M:%SZ', expiration_date.timetuple())
+        expiration_date_string = strftime('%Y-%m-%dT%H:%M:%SZ', expiration_date.timetuple())
         self.assertEqual(tkn["access_grant_expiration"][:-4], expiration_date_string[:-4])
 
     def test_revoke_endpoint(self):
diff --git a/apps/dot_ext/views/authorization.py b/apps/dot_ext/views/authorization.py
index a75d06f26..847bd1a99 100644
--- a/apps/dot_ext/views/authorization.py
+++ b/apps/dot_ext/views/authorization.py
@@ -321,6 +321,7 @@ def post(self, request, *args, **kwargs):
                 app_authorized.send(
                     sender=self, request=request,
                     token=token)
+
                 flag = get_waffle_flag_model().get("limit_data_access")
                 if flag.rollout or (flag.id is not None and flag.is_active_for_user(app.user)):
                     if app.data_access_type == "THIRTEEN_MONTH":
@@ -330,13 +331,13 @@ def post(self, request, *args, **kwargs):
                                 application=app
                             )
                             if dag.expiration_date is not None:
-                                dag_expiry = strftime('%Y-%m-%d %H:%M:%SZ', dag.expiration_date.timetuple())
+                                dag_expiry = strftime('%Y-%m-%dT%H:%M:%SZ', dag.expiration_date.timetuple())
                         except DataAccessGrant.DoesNotExist:
                             dag_expiry = ""
 
                     elif app.data_access_type == "ONE_TIME":
                         expires_at = datetime.utcnow() + timedelta(seconds=body['expires_in'])
-                        dag_expiry = expires_at.strftime('%Y-%m-%d %H:%M:%SZ')
+                        dag_expiry = expires_at.strftime('%Y-%m-%dT%H:%M:%SZ')
                     elif app.data_access_type == "RESEARCH_STUDY":
                         dag_expiry = ""