What I think really makes the most sense is just global time - UTC everywhere. Yes, I've seen the args against it and I think it would all be a lot more adaptable.
Either way, just stop it with moving the clocks. Not only is it a major PITA for everyone, studies have shown that it actually causes increases in road and work accidents. And, whatever rationale for energy savings has now been reversed, since air conditioning drives energy use far more than lighting. Just Stop It.
Note on the origin, from what I've read, one of the most likely origins is Ben Franklin's joke about the French, that they'd change the time system laws to save candle wax. I haven't read anything that substantially proves or refutes that, and I think we've honored Ben's joke enough already.