python - How to delete a certain model instance in django after a given date -

class mess(models.model):      muser = models.onetoonefield(user)      mess_name = (('gh','girls hostel top mess'),                 ('ih','girls hostel down mess'),                 ('mm','mega mess'),                 ('fb','first block mess'),                 ('sb','second block mess'),                 ('tb','third block mess'),                 )      mess_name = models.charfield(max_length=25, choices =mess_name,primary_key=true)      per_day_cost = models.integerfield()      def __str__(self):     return self.mess_name  class messmenu(models.model):     mess_name = models.foreignkey(mess)     day = models.datefield()     morning = models.textfield()     afternoon = models.textfield()     snacks = models.textfield()     dinner = models.textfield()     def __str__(self):         return self.mess_name 

once create object in messmenu want django delete object after 7 days. please let me know how delete object after given period of time.

add creation_date model.

if model belongs user: check if models outdated when user logs in.

otherwise write method call before access model. returns true if can access model , false, if it's outdated. if returns false delete it.

or write watchdog.