Custom transform for django date filter. It works like charm. :)

Custom_Transform.py

from django.db import models
from django.db.models import Transform


# Custom Date filter transform class
# Added by : Jay Modi
class MySQLDatetimeDate(Transform):
    """
    This implements a custom SQL lookup when using `__date` with datetimes.
    To enable filtering on datetimes that fall on a given date, import
    this transform and register it with the DateTimeField.
    http://blog.zdsmith.com/comparing-dates-and-datetimes-in-the-django-orm.html
    """
    lookup_name = 'customdate'

    def as_sql(self, compiler, connection):
        lhs, params = compiler.compile(self.lhs)
        return 'DATE({})'.format(lhs), params

    @property
    def output_field(self):
        return models.DateField()

# https://docs.djangoproject.com/en/1.8/howto/custom-lookups/#a-simple-transformer-example
# Added by : Jay Modi
from django.db.models import DateField
DateField.register_lookup(MySQLDatetimeDate)

dt = datetime.strptime(year+"/"+month+"/"+day, "%Y/%m/%d").date()
modelobj.objects.filter(date__customdate = dt)