Fix timezone-caused offset when directly creating a new slot in scheduler

AKModel/serializers.py

@@ -37,3 +37,12 @@ class AKSlotSerializer(serializers.ModelSerializer):
     class Meta:
         model = AKSlot
         fields = '__all__'
+
+    treat_as_local = serializers.BooleanField(required=False, default=False, write_only=True)
+
+    def create(self, validated_data:dict):
+        if validated_data['treat_as_local']:
+            validated_data['start'] = validated_data['start'].replace(tzinfo=None).astimezone(
+                validated_data['event'].timezone)
+        del validated_data['treat_as_local']
+        return super().create(validated_data)

AKScheduling/templates/admin/AKScheduling/scheduling.html

@@ -261,7 +261,8 @@
                             duration: $('#id_duration').val(),
                             room: $('#id_room').val(),
                             ak: ak,
-                            event: "{{ event.pk }}"
+                            event: "{{ event.pk }}",
+                            treat_as_local: true,
                         },
                         success: function (response) {
                            $('#newAKSlotModal').modal('hide');