[DerekL]

The Commerce Clause: >Article I, Section 8, Clause 3: [The Congress shall have power] To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes;

Here's an example. Suppose I'm driving down the highways, and I arrive at some town and I decide to stop for lunch. I see a parking space, but it says I can't park there at certain times. But every city in the country sets its own clocks. How do I figure out what time it is? That's a pain, right?

[AnimalMuppet]

That's quite a stretch. (Of course, the Commerce Clause has been stretched far beyond sanity before...)

And standard time was not instituted by the government, using the powers of the Commerce Clause. It was instituted by railroads, who found the exact issue you described to be a pain when trying to schedule trains.

[DerekL]

Yes, the Commerce Clause is not the best basis for this. Clause 5 is much better:

> [The Congress shall have power] To coin Money, regulate the Value thereof, and of foreign Coin, and fix the Standard of Weights and Measures;