def clean(self):
        act_date = start_date
        exp_date = end_date


        act_date = self.cleaned_data.get('activated')
        exp_date = self.cleaned_data.get('expiry')



        if act_date and exp_date:
            if act_date >= exp_date:
                raise forms.ValidationError("Activation date could not be on or after Expiry date ")
            if exp_date < datetime.today().date():
                raise forms.ValidationError("Expiry date must be a future date")

            """
              CREATING A SET OF DATE OBJECTS WITH THE NEW TIME SLOT
            """
            set_current = set([act_date + timedelta(days=day) for day in range((exp_date-act_date).days)])


            filter_conditions = Q(expiry__gt=act_date) & Q(governing_body=self.formkwargs.get('pk'))

            if self.instance:
                filter_conditions &= ~Q(id=self.instance.id)

            """
              SUBSCRIPTION PLAN MODEL CONTAINS OBJECTS WITH START_DATE as `activated` AND END_DATE as `expiry` SLOT.

            """

            for plan in SubscriptionPlan.objects.filter(filter_conditions):
                temp_date = set([plan.activated + timedelta(days=day)
                                 for day in range((plan.expiry-plan.activated).days)])
                if set_current.intersection(temp_date):
                    raise forms.ValidationError("You have another plan active within this time slot. "
                                                "[ %s to %s ]" % (plan.activated, plan.expiry))

        return super(SubscriptionForm, self).clean()