South Australia is about 1/2 an hour behind Marg, I had to look this up: Lord Howe Island is on its own island And then there's the anomaly of Lord Howe Island in Australia , which curiously puts its clocks back by just half an hour in the local Winter to GMT +10:30, only to skip ahead to GMT +11:00 in the Summer. Good luck figuring out how that works.Awkwardly, the island is half an hour ahead of Australian Eastern Standard Time. Though the atoll's time zone was officially standardized by the Standard Time Act 1987, and before that, by an earlier version of the same act in 1971, Lord Howe Island has been anecdotally adhering to its odd time-keeping since way back in 1904 (without concrete evidence, however).