def METHOD_NAME(apps, schema_editor):
    """For each Day, create a schedule block with the
       time block running from 0:00 to 23:59:59."""
    Day = apps.get_model('schedule', 'Day')
    ScheduleBlock = apps.get_model('schedule', 'ScheduleBlock')
    for day in Day.objects.all():
        start_time = datetime.datetime(year=day.date.year,
                                       month=day.date.month,
                                       day=day.date.day,
                                       hour=0,
                                       minute=0,
                                       tzinfo=datetime.timezone.utc)
        end_time = datetime.datetime(year=day.date.year,
                                       month=day.date.month,
                                       day=day.date.day,
                                       hour=23,
                                       minute=59,
                                       second=59,
                                       tzinfo=datetime.timezone.utc)
        block = ScheduleBlock.objects.create(start_time=start_time,
                                             end_time=end_time)
        block.save()