def METHOD_NAME(self, new_plan_start_time):
    clocked_task = DjangoCeleryBeatPeriodicTask.objects.get(id=self.clocked_task_id)
    new_clocked, _ = DjangoCeleryBeatClockedSchedule.objects.get_or_create(clocked_time=new_plan_start_time)
    clocked_task.clocked = new_clocked
    clocked_task.save()
    self.plan_start_time = new_plan_start_time
    self.save(update_fields=["plan_start_time"])