Australia spans 3 main time zones across the continent. The eastern states use Australian Eastern Time (AEST/AEDT), central regions use Australian Central Time (ACST/ACDT), and Western Australia uses Australian Western Time (AWST). Some states observe daylight saving time while others do not.
Eastern Time (UTC+10/+11) covers New South Wales, Victoria, Tasmania, Queensland, and ACT. Central Time (UTC+9:30/+10:30) covers South Australia and Northern Territory. Western Time (UTC+8) covers Western Australia. Note that Queensland, Northern Territory, and Western Australia do not observe daylight saving time.
Australia has some of the world's few half-hour time zones. Central Australia is UTC+9:30, creating a 30-minute offset from both Eastern and Western zones. During daylight saving, there can be up to 5 different times across Australia, with some border towns choosing to follow neighboring state times for practical reasons.