diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index aa6fd8d..6570b4b 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -689,7 +689,9 @@ class Event(models.Model):
         if intuitive:
             end_day = self.get_consolidated_end_day(False)
             if end_day != self.start_day and self.end_time and self.end_time < time(8):
-                return end_day + timedelta(days=-1)
+                if isinstance(end_day, str):
+                    end_day = date.fromisoformat(str(end_day))
+                return parse_date(end_day) + timedelta(days=-1)
             else:
                 return end_day
         else:
@@ -713,7 +715,10 @@ class Event(models.Model):
         return self.start_day == self.get_consolidated_end_day(intuitive)
 
     def is_event_long_duration(self, min_days=4, intuitive=True):
-        return parse_date(self.start_day) + timedelta(days=min_days) < parse_date(self.get_consolidated_end_day(intuitive))
+        end_date = self.get_consolidated_end_day(intuitive)
+        if isinstance(end_date, str):
+            end_date = parse_date(end_date)
+        return parse_date(self.start_day) + timedelta(days=min_days) < end_date
 
     def contains_date(self, d, intuitive=True):
         return d >= self.start_day and d <= self.get_consolidated_end_day(intuitive)