The choice of whether to use daylight saving time (DST) in Australia is a matter for the individual states and territories. However, during World War I and World War II all states and territories had daylight saving. In 1968 Tasmania became the first state since the war to practise daylight saving. In 1971, New South Wales, Victoria, Queensland, South Australia, and the Australian Capital Territory followed Tasmania by observing daylight saving. Western Australia and the Northern Territory did not. Queensland abandoned daylight saving time in 1972. Queensland and Western Australia have observed daylight saving over the past 40 years from time to time on trial bases.
New South Wales, the Australian Capital Territory, Victoria, Tasmania and South Australia observe DST every year. This has resulted in three time zones becoming five during the daylight-saving period. South Australia time becomes UTC+10:30, called Central Daylight Time (CDT), possibly with "Australia" prefixed (ACDT). The time in the southeastern states becomes UTC+11, using "Eastern" in the time zone name, Eastern Daylight Time (EDT), respectively Australia Eastern Daylight Time (AEDT).
Officially, the change to and from DST takes place at 2:00 am local standard time (which is 3:00 am 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 2008. Tasmania, owing to its further southern latitude began DST earlier, on the first Sunday in October, and ended on the first Sunday of April.
On 12 April 2007, New South Wales, Victoria, Tasmania and the Australian Capital Territory agreed to common starting and finishing dates for DST. From the 2008/09 period, the start of DST in these states and in South Australia commences on the first Sunday in October and ends on the first Sunday in April. Western Australia became the only state to observe daylight saving from the last Sunday in October to the last Sunday in March. Since 2009 Western Australia no longer observes daylight saving.
Queensland (AEST UTC+10), Northern Territory (ACST UTC+9:30) and Western Australia (AWST UTC+8) do not observe DST.
|State/territory||Start of DST||End of DST||Notes and other mentions|
|Australian Capital Territory (ACT)||First Sunday in October||First Sunday in April||-|
|New South Wales (NSW)||First Sunday in October||First Sunday in April||Observed DST in 1917, 1942–1944, and 1971-present.|
|Northern Territory (NT)||N/A||N/A||Observed DST in 1917 and 1942–1944.|
|Queensland (QLD)||N/A||N/A||Observed DST in 1917, 1942-1944, 1971-1972, and 1989–1992.|
|South Australia (SA)||First Sunday in October||First Sunday in April||Observed DST in 1917, 1942–1944, and 1971-present.|
|Tasmania (TAS)||First Sunday in October||First Sunday in April||Observed DST in 1916-1917, 1942–1944, and 1967-present.|
|Victoria (VIC)||First Sunday in October||First Sunday in April||Observed DST in 1917, 1942–1944, and 1971-present.|
|Western Australia (WA)||N/A||N/A||Observed DST in 1917, 1942-1943, 1974-1975, 1983-1984, 1991-1992, and 2006–2009.|
Queensland has had a particularly involved debate over daylight-saving time, with public opinion geographically divided. A referendum on daylight saving, was held on 22 February 1992, following a three-year trial (1989/90 - 1991/92), and was defeated with a 54.5% 'no' vote.[full citation needed]  The referendum result displayed a distinct trend - that public opinion on daylight saving in Queensland is geographically divided, with the ‘no’ vote strongest in the north and west regional districts, while the ‘yes’ vote was strongest in the state’s metropolitan south-east.
Since the early 2000s, there have been a number of petitions submitted to Queensland Parliament, lobbying for the introduction of daylight-saving time or for another referendum to be held. A petition in 2006 was signed by 62,232 people. In response to these petitions, then Queensland Premier Peter Beattie commissioned research to find out if daylight-saving time should be re-introduced into Queensland. Around this time, Premier Peter Beattie claimed that daylight-saving time in Queensland would increase the rate of skin cancer in the state, an unfounded claim for which there is no evidence according to the Queensland Cancer Fund.[full citation needed] 
In October 2007, the completed government-commissioned research was presented to a newly sworn-in Premier Anna Bligh, who ruled out holding a new referendum, despite the report indicating 59% of Queensland residents and 69% of South East Queenslanders to be in favour of adopting daylight-saving time.
In December 2008, the Daylight Saving for South East Queensland (DS4SEQ) political Party was officially registered, advocating the implementation of a dual-time zone arrangement for Daylight Saving in South East Queensland while the remainder of the state maintains standard time. The party contested the March 2009 Queensland State election with 32 candidates and received around one percent of the statewide primary vote, equating to around 2.5% across the 32 electorates contested.
In early 2010, the DS4SEQ political party approached independent Member, Peter Wellington, to introduce a private member's Bill for daylight saving. As Wellington agreed with the principles of the DS4SEQ proposal, specifically the dual time zone arrangement, he drafted the Daylight Saving for South East Queensland Referendum Bill 2010 and tabled the Bill into Queensland Parliament on 14 April 2010. Wellington has called for a referendum to be held at the next State election on the introduction of daylight saving into south-east Queensland under a dual-time zone arrangement.
In response to this Bill, Premier of Queensland, Anna Bligh, announced a community consultation process, which resulted in over 74,000 respondents participating, 64 percent of whom voted in favour of a trial and 63% were in favour of holding a referendum. The decision announced by the Premier on 7 June 2010 was that her Government would not support the Bill, because regional Queenslanders were overwhelmingly opposed to daylight saving. The Bill was defeated in Queensland Parliament on 15 June 2011.
Western Australia also had a particularly involved debate over daylight-saving time, with the issue being put to a referendum four times, 1975, 1984, 1992 and 2009. All were defeated. Voters returned a "no" vote of 54.57% in 2009, the highest in all four referendums. Each referendum followed a trial period during which the state observed daylight saving time. The first three followed a one-year trial, while the 2006 Western Australian Daylight Saving Bill (No. 2) 2006 instituted a daylight-saving trial that began on 3 December 2006 and lasted for three years. The referendum was defeated in 2009.
In 2000, all eastern jurisdictions that normally observe daylight-saving time — New South Wales, Victoria, the Australian Capital Territory and Tasmania — started daylight-saving time early, due to the 2000 Summer Olympics in Sydney. These jurisdictions changed on 27 August 2000. South Australia did not change until the regular time, which that year was on 29 October.
In 2006, all states that followed daylight-saving time (the above listed states plus South Australia) delayed the return to their respective Standard Times by a week, due to the 2006 Commonwealth Games in Melbourne. Daylight-saving time ended on 2 April 2006.
Daylight saving was first used in Australia during World War I, and was applied in all states. It was used again during the Second World War. A drought in Tasmania in 1967 led to the reintroduction of daylight saving in that state during the summer, and this was repeated every summer since then. In 1971, New South Wales, Victoria, Queensland, South Australia, and the Australian Capital Territory followed Tasmania by observing daylight saving. Western Australia and the Northern Territory did not. Queensland abandoned daylight saving time in 1972.
Originally Tasmania alone commenced daylight saving on the first Sunday in October, while the other states began on the last Sunday in October and finished on the last Sunday in March, until 2008. From 2008/09 daylight saving has been extended another four weeks in NSW, Victoria, SA and the ACT, in addition to Tasmania, from the first Sunday in October to the first Sunday in April.
Queensland again trialled daylight saving, for three years between 1989 and 1992, with a referendum on daylight saving held on 22 February 1992, which was defeated with a 54.5% ‘no’ vote - with regional and rural areas strongly opposed, while those in the metropolitan South East Queensland were in favour.
In December 2008, the Daylight Saving for South East Queensland (DS4SEQ) political party was officially registered, advocating the implementation of a dual-time zone arrangement for Daylight Saving in South East Queensland while the rest of the state maintains standard time. The party contested the March 2009 Queensland State election with 32 candidates and received around one percent of the statewide primary vote, equating to around 2.5% across the 32 electorates contested.
On 14 April 2010, and after being approached by the Daylight Saving for South East Queensland (DS4SEQ) political party, Queensland Independent member Peter Wellington, introduced the Daylight Saving for South East Queensland Referendum Bill 2010 into Queensland Parliament, calling for a referendum to be held at the next State election on the introduction of daylight saving into South East Queensland under a dual-time zone arrangement. The Bill was defeated in Queensland Parliament on 15 June 2011.
In Western Australia, four referendums in 1975, 1984, 1992 and 2009 have rejected DST. In 2006, the Parliament of Western Australia approved a three-year daylight saving trial to be followed by a referendum to decide whether DST should be put in place permanently. However, public opposition mounted during the first year of the trial, and the WA Nationals announced a public campaign to bring the referendum forward to 2007. The trial continued until the referendum, held on 16 May 2009. The result was another rejection of DST, by a larger margin compared to the three previous referendums. Although as previously the suburbs of the state capital, Perth, supported the proposal, it was by a much narrower margin than before with significant swings against it in several areas, most notably in the East Metropolitan region. As a result, the Premier of Western Australia has said that the DST issue should not be considered for at least another 20 years.
Despite this, in September 2016 the Daylight Saving Party was established by Wilson Tucker to contest seats in the Legislative Council at the upcoming 2017 state election. Tucker argued that in the seven years since the last referendum there had been a generational shift in Western Australia and that the fifth referendum would be successful. The party won 0.68% of the vote, or 9,209 votes statewide, but failed to win any seat in the Legislative Council.
The Northern Territory experimented with daylight saving in the early part of the 20th century. It was last used in 1944.
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