This is absolutely the wrong way to think about the matter. I am more against government overreach than most, but time schemes need to be uniform to work. They need to be governed. They maybe even need to be enforced. I don’t think this libertarian question has merit.Kids wait for the bus in the dark already. This will be nothing new. I did as a kid in the North. My kids did here in the South.
The proper question is why does the federal government have any say in the time anyway. Its a clear over-reach they started in 1918 due to "war". Just one more power grab during war they never gave up.