How to filter gte,lte date on datetime field?

I'm trying to figure out how to filter QuerySet using date extracted from datetime.

I use Django-filter and I can't compose such lookup without iterating over QuerySet which is very uneffective.

I tried datetime__date__gte which doesn't work.

class MyReservationsFilter(FilterSet):
    datetime__lte = DateFilter(method='datetime_filter',name='lte')
    class Meta:
        model = Reservation
        fields = {'status': ['exact'],
                  # 'datetime': ['lte', 'gte'],
                  'destination_from': ['exact'],
                  'destination_to': ['exact'],}


    def datetime_filter(self, queryset, name, value):

        lookup = 'datetime__'+name
        return queryset.filter(**{lookup:value})

Do you know what to do?

I can't use datetime__lte/gte because:

I have a Reservation object r.

>> r.datetime
>> datetime.datetime(2017, 8, 31, 17, 55)
>> r.datetime.date()
>> datetime.date(2017, 8, 31)

So now I try to filter based on date:

Reservation.objects.filter(datetime__lte=datetime.date(2017, 8, 31),datetime__gte=datetime.date(2017, 8, 31))

>> []

It's because it doesn't look only on date but on time too. So I need to extract date to be able to filter properly.