'Returns a two-elements list with the lower and upper bound to be used
with a BETWEEN operator to query a DateField value using a year lookup
`value` is an int, containing the looked-up year.
By default, it just calls `self.year_lookup_bounds`. Some backends need
this hook because on their DB date fields can\'t be compared to values
which include a time part.'

def year_lookup_bounds_for_date_field(self, value):

    return self.year_lookup_bounds(value)
