django patch

 import datetime

 import pytz
 from django.apps import AppConfig
 from django.db.models.fields import DateTimeField
 from django.utils.dateparse import parse_date
 from django.core.exceptions import ValidationError

 default_app_config = 'patch.PatchConfig'

 def patch():
     def get_db_prep_value(self, value, connection, prepared=False):
         if isinstance(value, str):
             if not value:
                 value = None
             elif not parse_date(value):
                 try:
                     value = datetime.datetime.fromtimestamp(int(value)).replace(tzinfo=pytz.UTC)
                 except:
                     raise ValidationError(
                         self.error_messages['invalid'],
                         code='invalid',
                         params={'value': value},
                     )
         if not prepared:
             value = self.get_prep_value(value)
         return connection.ops.adapt_datetimefield_value(value)

     DateTimeField.get_db_prep_value = get_db_prep_value

 class PatchConfig(AppConfig):
     name = 'patch'

     def ready(self):
         patch()