agendas: force dst when importing time period exception (#59342)

chrono/agendas/models.py

@@ -2571,7 +2571,7 @@ class TimePeriodException(models.Model):
     def import_json(cls, data):
         def import_datetime(s):
             '''Import datetime as a naive ISO8601 serialization'''
-            return make_aware(datetime.datetime.strptime(s, '%Y-%m-%d %H:%M:%S'))
+            return make_aware(datetime.datetime.strptime(s, '%Y-%m-%d %H:%M:%S'), is_dst=True)
 
         for k, v in data.items():
             if k.endswith('_datetime'):

tests/test_import_export.py

@@ -1009,3 +1009,33 @@ def test_export_deleted_meetingtype(app):
     meeting_type.save()
     output = get_output_of_command('export_site')
     assert len(json.loads(output)['agendas'][0]['meetingtypes']) == 0
+
+
+def test_import_export_exception_dst_change(app):
+    agenda_meetings = Agenda.objects.create(label='Meetings Agenda', kind='meetings')
+    desk = Desk.objects.create(agenda=agenda_meetings, label='Desk')
+
+    # create exception starting on dst change
+    start = make_aware(datetime.datetime(2022, 10, 30, 2, 0), is_dst=True)
+    end = make_aware(datetime.datetime(2022, 10, 31, 2, 0))
+    TimePeriodException.objects.create(desk=desk, start_datetime=start, end_datetime=end)
+
+    output = get_output_of_command('export_site')
+    payload = json.loads(output)
+    assert payload['agendas'][0]['desks'][0]['exceptions'][0]['start_datetime'] == '2022-10-30 02:00:00'
+
+    import_site(data=payload, overwrite=True)
+    exception = TimePeriodException.objects.get()
+    assert exception.start_datetime == start
+    assert exception.end_datetime == end
+
+    start = exception.start_datetime = make_aware(datetime.datetime(2022, 10, 30, 2, 0), is_dst=False)
+    exception.save()
+    output = get_output_of_command('export_site')
+    payload = json.loads(output)
+    assert payload['agendas'][0]['desks'][0]['exceptions'][0]['start_datetime'] == '2022-10-30 02:00:00'
+
+    import_site(data=payload, overwrite=True)
+    exception = TimePeriodException.objects.get()
+    # dst was forced on import
+    assert exception.start_datetime == start - datetime.timedelta(hours=1)