class MyUserManager(BaseUserManager):
def create_user(self, email, nickname, password=None, create_date = None)
    if not email:
        raise ValueError('Users must have an email address')

    user = self.model(
        email=MyUserManager.normalize_email(email),
        nickname=nickname,
        create_date = create_date,
    )

    user.set_password(password)
    user.save(using=self._db)
    return user

def create_superuser(self, email, nickname, password, create_date):
    u = self.create_user(email=email,
                         nickname=nickname,
                         password=password,
                         create_date = create_date,
                         )
    u.is_admin = True
    u.save(using=self._db)
    return u



class MyUser(AbstractBaseUser,  PermissionsMixin):
email = models.EmailField(
        verbose_name='email',
        max_length=255,
        unique=True,
    )
    nickname = models.CharField(
        u'닉네임',
        max_length=10,
        blank=False,
        unique=True,
        default=''
    )
    create_date = models.DateTimeField(
    u'가입날짜',
    max_length = 10,
    blank = False,
    default=timezone.now
    )
    objects = MyUserManager()

USERNAME_FIELD = 'email'
REQUIRED_FIELDS = ['nickname', 'gender', 'birthday', 'create_date']

def create_date(self):
    return self.create_date