In 1971, NSW, Victoria, Queensland, South Australia and the ACT adopted daylight saving, while Western Australia and the Northern Territory opted out. Queensland then abandoned daylight saving in 1972.
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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, under the defence power in section 51 of the constitution.

In 1968, Tasmania was the first state since the war to adopt daylight saving.
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In 1971, New South Wales, Victoria, Queensland, South Australia, 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.
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.


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