diff --git a/AKModel/views/manage.py b/AKModel/views/manage.py
index e4c7250381e6ef721f31ef568431dd9fe22c109c..369395d5504f26535bf126e068134262ea3a3a1e 100644
--- a/AKModel/views/manage.py
+++ b/AKModel/views/manage.py
@@ -150,8 +150,8 @@ class DefaultSlotEditorView(EventSlugMixin, IntermediateAdminView):
         previous_slot_ids = set(s.id for s in self.event.defaultslot_set.all())
 
         for slot in default_slots_raw:
-            start = parse_datetime(slot["start"]).astimezone(tz)
-            end = parse_datetime(slot["end"]).astimezone(tz)
+            start = parse_datetime(slot["start"]).replace(tzinfo=tz)
+            end = parse_datetime(slot["end"]).replace(tzinfo=tz)
 
             if slot["id"] != '':
                 id = int(slot["id"])