def get_user(self, model):
        if (self.user is None and
            hasattr(model, 'determine_user_for_changedesc')):
            self.user = model.determine_user_for_changedesc(self)
            self.save(update_fields=('user',))

        return self.user
Timestamp-like => dt64
dataset/ETHPy150Open reviewboard/reviewboard/reviewboard/changedescs/models.py/ChangeDescription.get_user--crossover with--dataset/ETHPy150Open pydata/pandas/pandas/tseries/index.py/_to_m8