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class UpdateInfoBaseModel(models.Model):
    createtime = models.DateTimeField(auto_now_add=True)
    lastupdatetime = models.DateTimeField(auto_now=True)

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                for field in new_entry._meta.local_fields:
                    if field.name == "lastupdatetime":
                        field.auto_now = False
                    elif field.name == "createtime":
                        field.auto_now_add = False

                new_entry.createtime = date
                new_entry.lastupdatetime = date
                new_entry.save()

                for field in new_entry._meta.local_fields:
                    if field.name == "lastupdatetime":
                        field.auto_now = True
                    elif field.name == "createtime":
                        field.auto_now_add = True

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def pre_save(self, *args, **kwargs):
    return super(DateTimeField, self).pre_save(*args, **kwargs)

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def disable_auto_fields(model_class):
    ATTR_NAMES = ("auto_now", "auto_now_add")
    for field in model_class._meta.local_fields:
        for attr_name in ATTR_NAMES:
            if getattr(field, attr_name, False) == True:
                print "Disable '%s' on field %s.%s" % (attr_name, model_class.__name__, field.name)
                setattr(field, attr_name, False)