diff --git a/base_jsonify/models/models.py b/base_jsonify/models/models.py
index 14e00e103..a235fed74 100644
--- a/base_jsonify/models/models.py
+++ b/base_jsonify/models/models.py
@@ -72,9 +72,15 @@ class Base(models.AbstractModel):
                     if value is False and field_type != 'boolean':
                         value = None
                     elif field_type == "date":
-                        value = fields.Date.to_string(value)
+                        value = fields.Date.to_date(value).isoformat()
                     elif field_type == "datetime":
-                        value = fields.Datetime.to_string(value)
+                        # Ensures value is a datetime
+                        value = fields.Datetime.to_datetime(value)
+                        # Get the timestamp converted to the client's timezone.
+                        # This call also add the tzinfo into the datetime
+                        # object
+                        value = fields.Datetime.context_timestamp(rec, value)
+                        value = value.isoformat()
                     res[json_key] = value
             result.append(res)
         return result
diff --git a/base_jsonify/tests/test_get_parser.py b/base_jsonify/tests/test_get_parser.py
index 5aea2d55f..c1cff67d2 100644
--- a/base_jsonify/tests/test_get_parser.py
+++ b/base_jsonify/tests/test_get_parser.py
@@ -40,6 +40,8 @@ class TestParser(TransactionCase):
         self.assertEqual(parser, expected_parser)
 
     def test_json_export(self):
+        # Enforces TZ to validate the serialization result of a Datetime
+        self.env.user.tz = "Europe/Brussels"
         parser = [
             'lang',
             'comment',
@@ -70,8 +72,13 @@ class TestParser(TransactionCase):
                     'country_id': self.env.ref('base.fr').id
                 })
             ],
-            'date': fields.Date.today()
+            'date': fields.Date.from_string("2019-10-31")
         })
+        self.env.cr.execute(
+            "update res_partner set create_date=%s where id=%s",
+            ("2019-10-31 14:39:49", partner.id),
+        )
+        partner.refresh()
         expected_json = {
             'lang': 'en_US',
             'comment': None,
@@ -96,8 +103,8 @@ class TestParser(TransactionCase):
                 'name': 'Sebatien Beau',
                 'email': None
             }],
-            'create_date': fields.Datetime.to_string(partner.create_date),
-            'date': fields.Date.to_string(partner.date)
+            "create_date": "2019-10-31T15:39:49+01:00",
+            "date": "2019-10-31",
         }
         json_partner = partner.jsonify(parser)