diff --git a/webapp/tests/test_event.py b/webapp/tests/test_event.py
index b3c33d1..2f094f0 100644
--- a/webapp/tests/test_event.py
+++ b/webapp/tests/test_event.py
@@ -2,6 +2,7 @@ from django.contrib.auth.models import User, AnonymousUser
 from django.utils import timezone
 from rest_framework import status
 from rest_framework.test import APITestCase, APIRequestFactory
+import zoneinfo
 
 from webapp.models import Event
 from webapp.serializers import EventSerializer
@@ -14,28 +15,29 @@ URL = "/api/events/"
 
 class EventTestCase(APITestCase):
     def setUp(self):
+        tz=zoneinfo.ZoneInfo(key='Europe/Helsinki')
         # Visible and relevant
         test1 = createEventObject(
-            "Testitapahtuma1", start_time=timezone.datetime(2019, 11, 9, 12, 0, 0)
+            "Testitapahtuma1", start_time=timezone.datetime(2019, 11, 9, 12, 0, 0, tzinfo=tz)
         )
         # Invisible but relevant
         createEventObject(
             "Testitapahtuma2",
             visible=False,
-            start_time=timezone.datetime(2018, 11, 9, 12, 0, 0),
+            start_time=timezone.datetime(2018, 11, 9, 12, 0, 0, tzinfo=tz),
         )
         # Visible but unrelevant
         test2 = createEventObject(
             "Testitapahtuma3",
             visible=True,
-            start_time=timezone.datetime(2018, 12, 9, 12, 0, 0),
-            end_time=timezone.datetime(2018, 12, 9, 13, 0, 0),
+            start_time=timezone.datetime(2018, 12, 9, 12, 0, 0, tzinfo=tz),
+            end_time=timezone.datetime(2018, 12, 9, 13, 0, 0, tzinfo=tz),
         )
         # Visible and relevant
         createEventObject(
             "Testitapahtuma4",
             visible=True,
-            start_time=timezone.datetime(2018, 12, 9, 12, 0, 0),
+            start_time=timezone.datetime(2018, 12, 9, 12, 0, 0, tzinfo=tz),
         )
         # Add some tags
         tag1 = tagBuilder()
@@ -77,7 +79,7 @@ class EventTestCase(APITestCase):
         self.assertEqual(response.data["results"], expected)
 
     def test_get_events_since(self):
-        response = self.client.get(f"{URL}?since=2018-01-01", format="json")
+        response = self.client.get(f"{URL}?since=2018-01-01%2000:00:00%2B0200", format="json")
         self.assertTrue(response.status_code, status.HTTP_200_OK)
         self.assertEqual(len(response.data["results"]), 3)