Australian Eastern Standard Time (AEST) covers the eastern states of Queensland, New South Wales, Victoria, Tasmania and the Australian Capital Territory. AEST is equal to Coordinated Universal Time plus 10 hours (UTC +10).
Australian Central Standard Time (ACST) covers the state of South Australia, the town of Broken Hill in western New South Wales and the Northern Territory. ACST is equal to Coordinated Universal Time plus 9.5 hours (UTC +9.5).
Australian Western Standard Time (AWST) covers Western Australia. AWST is equal to Coordinated Universal Time plus 8 hours (UTC +8).
In summer, New South Wales, Victoria, South Australia, Tasmania and the ACT turn their clocks forward one hour to Daylight Saving Time (DST). Daylight Saving Time begins at 2:00am (AEST) on the first Sunday in October and ends at 3:00am (Australian Eastern Daylight Time) on the first Sunday in April.
NSW, ACT, Victoria and Tasmania move from AEST to Australian Eastern Daylight Time (AEDT), UTC +11. South Australia and the NSW town of Broken Hill move from ACST to Australian Central Daylight Time (ACDT), UTC +10.5.
Daylight saving is not observed in Queensland, the Northern Territory or Western Australia.