DST is in opposite halves of the year in different hemispheres, and also the transition dates will be different in different DST-using countries even in the sam

DST is in opposite halves of the year in different hemispheres, and also the transition dates will be different in different DST-using countries even in the same hemisphere. So the timezone difference between US and Australia (or at least their DST using parts, since in both countries some states don’t observe DST) is 2 hours more in one half of the year than the other. And it changes four times. In January, Australia has DST and US doesn’t. Then in March US starts DST and moves one hour away. In April, Australia ends DST and moves another hour away (in the opposite direction). In October, Australia starts DST and moves an hour closer to US. In November, US ends DST and moves another hour closer to Australia.