diff --git a/src/agenda_culturel/import_tasks/extractor.py b/src/agenda_culturel/import_tasks/extractor.py
index 67c855a..e8b8339 100644
--- a/src/agenda_culturel/import_tasks/extractor.py
+++ b/src/agenda_culturel/import_tasks/extractor.py
@@ -184,7 +184,7 @@ class Extractor(ABC):
         if start_day is None:
             print("WARNING: cannot publish an event without start day")
             published = False
-            start_day = datetime.now().date()
+            start_day = datetime.now().date().strftime("%Y-%m-%d")
             comments = 'Warning: the date has not been imported correctly.'
             title += ' - Warning: the date has not been imported correctly.'