diff --git a/models/res_partner_contract.py b/models/res_partner_contract.py
index 47aa242..db95c18 100644
--- a/models/res_partner_contract.py
+++ b/models/res_partner_contract.py
@@ -1,7 +1,6 @@
 import datetime
 
 from odoo import _, api, fields, models
-from odoo.tools.misc import DEFAULT_SERVER_DATE_FORMAT, DEFAULT_SERVER_DATETIME_FORMAT
 
 from ..utils import MODULE_NAME
 from ..utils.misc import Extension, IDocument
@@ -127,10 +126,9 @@ class PartnerContract(models.Model, IDocument, Extension):
         """
         date = self.date_conclusion_fix or self.date_conclusion
         if date:
-            date = datetime.datetime.strptime(date, DEFAULT_SERVER_DATE_FORMAT)
+            date = self.parse_odoo_date(date)
         else:
-            date = self.create_date
-            date = datetime.datetime.strptime(date, DEFAULT_SERVER_DATETIME_FORMAT)
+            date = self.parse_odoo_datetime(self.create_date)
         return date
 
     def _(self, arg):