Storing datetimefiled in django models, int () argument must be string or number

This is my django model

class Mymodel(models.Model):

    email = models.ForeignKey(EmailAddress)
    created = models.DateTimeField(default=timezone.now)

      

        
        
        
      

    

I am linking to instantiate the model and tring to store it like This

x = Mymodel (email_object, timezone.now ())

x.save ()

then it gives this error

TypeError: int() argument must be a string or a number, not 'datetime.datetime'

Instead of timezone.now () I saved the time as a string and then gave this error

ValueError: invalid literal for int() with base 10: '2014-11-29 06:00:00.000000 08:00'

How can I fix this .. please help me .. what format do I need to send the datetime object in