diff --git a/models/event.py b/models/event.py
index b5a68f5..a663be4 100644
--- a/models/event.py
+++ b/models/event.py
@@ -75,6 +75,13 @@ class Event(models.Model):
             raise ValidationError(
                 _('Date most be supperior to to start date'))
 
+    @api.constrains('date_start')
+    def _check_date_start(self):
+        """Test si la modification de la date de fin n'est pas anterieur à la date de début"""
+        if self.date_end < self.date_start:
+            raise ValidationError(
+                _('Date most be inferior to to end date'))
+
 
     @api.depends('date_start', 'date_end')
     def _compute_duration(self):