diff --git a/tests/test_manager.py b/tests/test_manager.py
index 7d1120c1..68933802 100644
--- a/tests/test_manager.py
+++ b/tests/test_manager.py
@@ -1412,7 +1412,8 @@ def test_agenda_import_time_period_exception_from_remote_ics_with_ssl_error(mock
     assert 'Failed to retrieve remote calendar (https://example.com/foo.ics, SSL error).' in resp.text
 
 
-def test_meetings_agenda_delete_time_period_exception_source(app, admin_user):
+def test_meetings_agenda_delete_time_period_exception_source(app, admin_user, freezer):
+    freezer.move_to('2019-12-01')
     agenda = Agenda.objects.create(label='Foo bar', kind='meetings')
     desk = Desk.objects.create(agenda=agenda, label='Desk A')
     MeetingType(agenda=agenda, label='Blah').save()
@@ -1470,7 +1471,8 @@ END:VCALENDAR"""
     assert TimePeriodExceptionSource.objects.filter(pk=source1.pk).exists() is False
 
 
-def test_meetings_agenda_replace_time_period_exception_source(app, admin_user):
+def test_meetings_agenda_replace_time_period_exception_source(app, admin_user, freezer):
+    freezer.move_to('2019-12-01')
     agenda = Agenda.objects.create(label='Foo bar', kind='meetings')
     desk = Desk.objects.create(agenda=agenda, label='Desk A')
     MeetingType(agenda=agenda, label='Blah').save()