diff --git a/chrono/agendas/models.py b/chrono/agendas/models.py
index fc25cfa9..732754e6 100644
--- a/chrono/agendas/models.py
+++ b/chrono/agendas/models.py
@@ -349,7 +349,7 @@ class Event(models.Model):
 
     def export_json(self):
         return {
-            'start_datetime': self.start_datetime.strftime('%Y-%m-%d %H:%M:%S'),
+            'start_datetime': make_naive(self.start_datetime).strftime('%Y-%m-%d %H:%M:%S'),
             'places': self.places,
             'waiting_list_places': self.waiting_list_places,
             'label': self.label
diff --git a/tests/test_import_export.py b/tests/test_import_export.py
index cd6a71eb..e0e01311 100644
--- a/tests/test_import_export.py
+++ b/tests/test_import_export.py
@@ -34,6 +34,8 @@ def get_output_of_command(command, *args, **kwargs):
 
 
 def test_import_export(app, some_data, meetings_agenda):
+    first_event = Agenda.objects.get(label='Foo bar').event_set.first()
+
     # add exception to meeting agenda
     desk = meetings_agenda.desk_set.first()
     tpx_start = make_aware(datetime.datetime(2017, 5, 22, 8, 0))
@@ -64,6 +66,8 @@ def test_import_export(app, some_data, meetings_agenda):
         call_command('import_site', f.name)
 
     assert Agenda.objects.count() == 3
+    first_imported_event = Agenda.objects.get(label='Foo bar').event_set.first()
+    assert first_imported_event.start_datetime == first_event.start_datetime
     assert TimePeriodException.objects.get().start_datetime == tpx_start
     assert TimePeriodException.objects.get().end_datetime == tpx_end