def _post_setattr_minimum(self, old, new):
        if new > self.maximum:
            self.maximum = new
        if new > self.datetime:
            self.datetime = new
Post setattr the minimum datetime.
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/widgets/bounded_datetime.py/BoundedDatetime._post_setattr_minimum