fix date format

tournaments/models.py

@@ -248,7 +248,11 @@ class Match(models.Model):
         return map(lambda ts: ts.player_names(), self.team_states.all())
 
     def formatted_start_date(self):
-        return str(self.start_date) #.strftime("%H:%M")
+        if self.start_date:
+            return self.start_date.strftime("%H:%M")
+        else:
+            return "no date"
+        # return str(self.start_date) #.strftime("%H:%M")
 
 class TeamRegistration(models.Model):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)