fix: django: json key deserialisation

estimevent/contrib/django/estimevent/models.py

@@ -2,6 +2,7 @@
 
 import json
 import hashlib
+import datetime
 
 from django.db import models
 from django.db import transaction
@@ -217,7 +218,10 @@ class EstimEvent(models.Model):
 
     @property
     def key(self):
-        return json.loads(self.json_key)
+        _key = json.loads(self.json_key)
+        _key['date_debut'] = datetime.datetime.strptime(_key['date_debut'], '%Y-%m-%d').date()
+        _key['date_fin'] = datetime.datetime.strptime(_key['date_fin'], '%Y-%m-%d').date()
+        return _key
 
     @staticmethod
     def compute_hash(data):