validation - How can I set bounds for a Django Model DateField? -

in model:

birth_date = models.datefield(verbose_name='d.o.b') 

how can set bounds this, such as:

01-01-1990 (current date - 18 years) 

i'm assuming there's way set in model it's included default in forms, i've never used dates in project before, i'm not sure how done.

it useful know how datetimefield , timefield if isn't same.

thanks!

datetimefield , timefield not have options set lower , upper bounds. however, possible write validators type of field.

a validator check date of birth like:

from datetime import date django.core.exceptions import validatonerror  def validate_dob(value):     """makes sure date been 1990-01-01 , 18 years ago."""     today = date.today()     eighteen_years_ago = today.replace(year=today.year - 18)     if not date(1990, 1, 1) <= value <= eighteen_years_ago:         raise validationerror("date must between %s , %s" % (date(1990,1,1,), eighteen_years_ago) 

then use validator in model field.

birth_date = models.datefield(verbose_name='d.o.b', validators=[validate_dob])