Time zones
Why Australia has state-by-state daylight-saving time
Australia is not one clock. Its states and territories use several standard offsets and make separate choices about daylight saving, creating summer differences inside one country.
Several standard clocks before summer begins
Australia already spans more than one standard offset: Perth uses UTC+8, the Northern Territory uses UTC+9:30, and eastern states use UTC+10. There are further local exceptions, including the UTC+8:45 area around Eucla and Lord Howe Island’s separate rule.
Daylight saving is not national
The ACT, New South Wales, South Australia, Tasmania and Victoria observe daylight saving. Queensland, the Northern Territory and Western Australia do not. During the summer transition period, Sydney and Brisbane can be an hour apart despite sharing the same standard eastern-time offset.
State rules create practical edge cases
Australian transport guidance also calls out Broken Hill, which follows South Australia’s clock rule rather than the rest of New South Wales. For bookings, school calls and remote work, use the city and date—not “Australian time”.