Australian time zones during daylight-saving time (from southern spring to southern autumn)
Each state and territory of Australia determines whether or not to use daylight saving time (DST). However, during World War I and World War II all states and territories had daylight saving by federal law,[1] under the defence power in section 51 of the constitution. In 1968, Tasmania was the first state since the war to adopt daylight saving. In 1971, New South Wales, Queensland, South Australia, Victoria, and the Australian Capital Territory also adopted daylight saving, while Western Australia and the Northern Territory did not. Queensland abandoned daylight saving in 1972. Queensland and Western Australia have observed daylight saving over the past 40 years from time to time on a trial basis.
As of 2024, New South Wales, the Australian Capital Territory, Victoria, Tasmania and South Australia observe DST every year, while Queensland, the Northern Territory and Western Australia do not. This causes the mainland's three standard time zones to increase to five during the daylight-saving period. South Australia time diverges from Northern Territory time to become UTC+10:30, known as Central Daylight Time (CDT) or Australia Central Daylight Time (ACDT), while the time in the southeastern states diverges from Queensland time to become UTC+11:00, known as Eastern Daylight Time (EDT) or Australia Eastern Daylight Time (AEDT).
Officially, the change to and from DST takes place at 02:00 local standard time (which is 03:00 DST) on the appropriate Sunday. Of the states that observe DST, most began on the last Sunday in October, and ended on the last Sunday in March, until 2007. Tasmania, owing to its further southern latitude began DST earlier, on the first Sunday in October, and ended on the last Sunday in March. In the 2007–08 season, Tasmania started on the first Sunday in October whilst the ACT, NSW, Vic and SA started in the last Sunday in October. As part of the transition to earlier daylight saving, those states and Tasmania all finished on the first Sunday in April. For subsequent years, DST in the south-eastern states and SA now starts on the first Sunday in October, finishing on the first Sunday in April the next year. Western Australia was not affected by these changes to DST, being the only state in 2007–08 to observe daylight saving from the last Sunday in October to the last Sunday in March. However, since 2009, it is on Standard time all year round.[2]
State/territory
Start of DST
End of DST
Notes and other mentions
Australian Capital Territory (ACT)
First Sunday in October (since 2008–09)
First Sunday in April (2005–06 and since 2007–08)
Since 1971.
New South Wales (NSW)
First Sunday in October (since 2008–09)
First Sunday in April (2005–06 and since 2007–08)
Observed DST in 1917, 1942–1944, and since 1971.[3]
Northern Territory (NT)
—
—
Observed DST in 1917 and 1942–1944.
Queensland (QLD)
—
—
Observed DST in 1917, 1942–1944, 1971–1972, and 1989–1992.
South Australia (SA)
First Sunday in October (since 2008–09)
First Sunday in April (2005–06 and since 2008–09)
Observed DST in 1917, 1942–1944, and since 1971.
Tasmania (TAS)
First Sunday in October (since 1992–93 except for 2000–01 when it began on the Last Sunday in August)
First Sunday in April (2005–06 and since 2007–08)
Observed DST in 1916–1917, 1942–1944, and since 1967.
Victoria (VIC)
First Sunday in October (since 2008–09)
First Sunday in April (2005–06 and since 2007–08)[4]
Observed DST in 1917, 1942–1944, and since 1971.
Western Australia (WA)
—
—
Observed DST in 1917, 1942–1943, 1974–1975, 1983–1984, 1991–1992, and 2006–2009.
^Pearce, C. (2017). "History of daylight saving time in Queensland". Queensland History Journal. 23 (6): 389–403.
^"Daylight Saving Time – Implementation". Bom.gov.au. Retrieved 25 June 2010.
^"Time zone in Sydney". Daylight Saving Time. timeanddate.com. Retrieved 22 February 2013.
^"Daylight Saving in Victoria (Victoria Online)". Vic.gov.au. 22 February 2013. Archived from the original on 14 October 2011. Retrieved 25 June 2010.
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