Add tests for registration ability outer registration dates

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

registration/models.py

@@ -1,7 +1,7 @@
 # Copyright (C) 2020 by Animath
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from datetime import date, datetime
+from datetime import date
 
 from django.conf import settings
 from django.contrib.sites.models import Site
@@ -774,7 +774,7 @@ class Payment(models.Model):
             return checkout_intent
 
         tournament = self.tournament
-        year = datetime.now().year
+        year = timezone.now().year
         base_site = "https://" + Site.objects.first().domain
         checkout_intent = helloasso.create_checkout_intent(
             amount=100 * self.amount,