All I've discovered is that people have really strong opinions on this.

Also, just a reminder, the winter is Standard Time that tries to match local noon (when the sun is highest in the sky, halfway btwn sunrise and sunset) as best as it can to 12 on the clock. The summer is Daylight Saving Time, which is an hour off from local noon. More or less.

Any state can remove DST at any time and use Standard Time always (see Hawaii, Arizona. How this would work for the District I dunno, probably can't). But Congress has to act to shift everyone to DST and eliminate Standard Time.