We still have 2 states that do not observe DST...Hawaii and Arizona. There used to be more that did not. So Australia is not that unique, although it used to be more confusing here in the past than it is now. So what about that website that says it's 8AM in Sydney and 7:30AM in Adelaide??? Does that really happen? Are there differences in half-hour increments? I would think that regardless of DST or no DST, differences should be in whole hours; otherwise, you're sub-dividing time zones.