Не продляется подписка при оплате лиликами

apps/payment/views.py

@@ -135,6 +135,11 @@ class SchoolBuyView(TemplateView):
         payment_id = request.GET.get('payment_id')
         package = get_object_or_404(Package, duration=duration)
         date_start = date_start and datetime.datetime.strptime(date_start, '%Y-%m-%d').date() or now().date()
+        prev_payment = SchoolPayment.objects.paid().filter(
+                user=self.request.user,
+                date_end__gte=now().date(),).last()
+        if prev_payment and prev_payment.date_end > date_start:
+            date_start = prev_payment.date_end + timedelta(1)
         if payment_id:
             school_payment = get_object_or_404(SchoolPayment, id=payment_id)
         else: