diff --git a/src/agenda_culturel/importation.py b/src/agenda_culturel/importation.py
index 2760438..c35994a 100644
--- a/src/agenda_culturel/importation.py
+++ b/src/agenda_culturel/importation.py
@@ -53,11 +53,8 @@ class EventsImporter:
 
         # get events
         for event in structure["events"]:
-            if "created_date" not in event:
-                if self.date is not None:
-                    event["created_date"] = self.date
-                else:
-                    event["created_date"] = datetime.now()
+            if "last_modified" not in event and self.date is not None:
+                event["last_modified"] = self.date
 
             if not self.import_event(event):
                 return (False, self.error_message)