Ruqayyah Snyder
Australia has three separate time zones: Australian Eastern Standard Time (AEST), Australian Central Standard Time (ACST), and Australian Western Standard Time (AWST). Daylight Saving Time (DST) is observed in some states and territories, but not all. In 2025, DST will end on Sunday, April 6, at 3:00 a.m. local daylight time, when clocks will be turned back one hour to 2:00 a.m. local standard time. DST will begin again on Sunday, October 5, at 2:00 a.m. local standard time, when clocks will be turned forward one hour to 3:00 a.m. local daylight time.
| Characteristics | Values |
|---|---|
| Date of clock change | Sunday, 6 April 2025 |
| Time of clock change | 3:00:00 am |
| New time after clock change | 2:00:00 am |
| Time difference | Clocks turned back by 1 hour |
| Sunrise and sunset | 1 hour earlier than the previous day |
| Daylight | More light in the morning and less light in the evening |
| Sleep | Extra hour of sleep |
| Affected areas | New South Wales, Victoria, South Australia, Tasmania, and the Australian Capital Territory |
| Unaffected areas | Queensland, Western Australia, and the Northern Territory |
| Date of next clock change | Sunday, 5 October 2025 |
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What You'll Learn
Daylight Saving Time (DST) in Australia
The history of DST in Australia is quite varied. DST was first observed in 1916 during World War I, when Tasmania became the first state to use it. In 1917, it was applied across all Australian states and territories, but it was removed in 1918. DST was then reintroduced during World War II from 1942 to 1944. After the war, DST was not observed in any state or territory until 1967, when Tasmania brought it back during a drought. In 1971, several other states followed Tasmania, but Queensland abandoned DST in 1972, and Western Australia has conducted unsuccessful trials of DST, most recently from 2006 to 2009.
In the states that observe DST, it typically starts on the first Sunday of October and ends on the first Sunday of April. This means that on the first Sunday in October, at 2:00 am local standard time, clocks are turned forward one hour to 3:00 am local daylight time. On the first Sunday in April, at 3:00 am local daylight time, clocks are turned backward one hour to 2:00 am local standard time. This results in more daylight in the evenings during the summer months and more daylight in the mornings during the winter months.
The transition to and from DST can affect people's sleep schedules and daily routines, with some people losing or gaining an hour of sleep depending on the time change. Additionally, the inconsistent adoption of DST across Australia's states and territories can lead to some confusion, with the mainland's three standard time zones increasing to five time zones during the summer. Despite these challenges, DST is still observed in many parts of Australia, with the goal of optimizing daylight hours and adapting to seasonal changes.
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Time zones in Australia
Australia uses three main time zones: Australian Eastern Standard Time (AEST), Australian Central Standard Time (ACST), and Australian Western Standard Time (AWST). The standardisation of time in Australia began in 1892, when surveyors from the six colonies in Australia met in Melbourne for the Intercolonial Conference of Surveyors. The three time zones became known as Western Standard Time, Central Standard Time, and Eastern Standard Time.
AEST is equal to Coordinated Universal Time plus 10 hours (UTC +10) and covers the eastern states of Queensland, New South Wales, Victoria, Tasmania, and the Australian Capital Territory (ACT). During DST, AEST becomes AEDT (Australian Eastern Daylight Saving Time), UTC+11:00.
ACST is equal to Coordinated Universal Time plus 9.5 hours (UTC +9.30) and covers the state of South Australia, the town of Broken Hill in western New South Wales, and the Northern Territory. During DST, ACST becomes ACDT (Australian Central Daylight Saving Time), UTC+10:30.
AWST is equal to Coordinated Universal Time plus 8 hours (UTC +8) and covers the state of Western Australia.
It is worth noting that not all states and territories in Australia use DST. The states that do use DST are the Australian Capital Territory, New South Wales, South Australia, Tasmania, and Victoria. Western Australia, Queensland, and the Northern Territory do not use DST.
There are also some locations in Australia that observe time zones different from the rest of their state. For example, Broken Hill in New South Wales observes ACST, which is 30 minutes behind the rest of the state. Eucla in Western Australia is 45 minutes ahead of the rest of the state and has its own time zone, ACWST (Australian Central Western Standard Time). Heron Island, off the coast of Gladstone in Queensland, has two time zones: the island resort follows DST all year round, while the Marine Research Centre and the Parks and Wildlife office on the island remain on Eastern Standard Time.
In addition to the time zones on the Australian mainland, there are also time zones for Australian dependencies, such as the Cocos Islands, Norfolk Island, and Christmas Island, which do not observe DST.
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How to change clocks in Australia
In Australia, the clocks change twice a year, once in April and once in October. The exact dates vary each year, but the clocks typically go forward in early October and backward in early April.
Not all parts of Australia change their clocks. Queensland, Western Australia, and the Northern Territory do not observe daylight saving, so they don't change their clocks. However, the Australian Capital Territory, New South Wales, South Australia, Victoria, and Tasmania do.
If you live in a part of Australia that observes daylight saving, you will need to change the time on analogue clocks and watches manually. You may also need to manually adjust the time on devices like your oven and microwave. Most smart devices, such as phones and laptops, will automatically update the time.
When the clocks go forward in October, you will need to set your clocks one hour forward. This will mean less light in the morning and more light in the evening. When the clocks go backward in April, you will need to set your clocks one hour backward. This will mean more light in the morning and less light in the evening.
Some people find that the change in clocks disrupts their sleep schedule, especially when the clocks go forward in October, as this results in one less hour of sleep. However, others find that the change in clocks can help them adjust to an earlier sleep schedule.
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History of DST in Australia
The history of Daylight Saving Time (DST) in Australia dates back over a century. On 2 October 1916, during World War I, Tasmania became the first state in Australia to adopt DST. The following year, in 1917, all Australian states and territories followed suit, implementing DST nationwide. However, this was short-lived as DST was removed across the country in 1918.
DST made a comeback in Australia during World War II, from 1942 to 1944, as a wartime measure to conserve energy and resources. After the war ended, DST was once again discontinued in all Australian states and territories until 1967.
In 1967, facing a drought, Tasmania reintroduced DST and has continued to observe it since then. In 1971, several other states, including the Australian Capital Territory, New South Wales, South Australia, Victoria, and Queensland, followed suit and adopted DST. However, Queensland abandoned DST in 1972, and it has not been observed in the state since, except for a trial period from 1989 to 1992.
Over the years, there have been varying levels of support for DST across different states in Australia. Western Australia, for example, conducted a DST trial from 2006 to 2009 but ultimately abandoned it due to its unpopularity among the public. On the other hand, states like New South Wales, South Australia, Tasmania, and Victoria continue to observe DST, with the time change occurring on the first Sunday of October to the first Sunday of April.
The inconsistent adoption of DST across Australia has resulted in the mainland's three standard time zones increasing to five time zones during the summer months. This highlights the ongoing debate and varying preferences among Australians regarding DST.
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Impact of DST on sleep schedules
In Australia, Daylight Saving Time (DST) begins on the first Sunday in October and ends on the first Sunday in April. During DST, the clocks are turned forward by one hour, resulting in more daylight in the evenings and less in the mornings.
The transition to and from DST can have a significant impact on sleep schedules and overall health. When DST begins in spring, the change in time disrupts the natural sleep-wake cycle, also known as the circadian rhythm, which is heavily reliant on natural light and darkness as drivers of alertness and sleepiness. As a result, people may experience a reduction in the total amount of sleep, as it becomes harder to fall asleep at the usual bedtime due to the increased exposure to light in the evenings. This misalignment between our internal clocks and social clocks can lead to adverse health consequences, including decreased cardiovascular health, increased risk of diabetes and obesity, poorer mental health, lower cognitive performance, and a higher risk of motor vehicle accidents.
The effects of DST on sleep schedules are particularly noticeable among students, who have been found to be sleepier, have slower reaction times, and exhibit less attention during school days following the time change. Additionally, certain groups are more vulnerable to the negative health impacts of DST transitions. These include populations living on the western edges of time zones, who experience a shift in light patterns, and individuals with inflexible schedules, such as early-morning shift workers.
On the other hand, the end of DST in autumn provides an extra hour of sleep, which can positively impact health and well-being. It also aligns better with natural light and darkness during the winter months, reducing risks associated with insufficient sleep, such as heart attacks, strokes, and sleep-related mood disorders.
To mitigate the impact of DST on sleep schedules, it is recommended to make small adjustments in the days leading up to the transition. Maintaining a consistent sleep and wake time, even after gaining an extra hour, can help regulate sleep. While the majority of people can adjust to the time change within a week, it is beneficial to prioritise healthy sleep hygiene practices during this transition period.
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Frequently asked questions
Clocks change on the first Sunday of April and the first Sunday of October.
Clocks go forward on the first Sunday of October.
Clocks go back on the first Sunday of April.
No, only some parts of Australia use DST. Queensland, Western Australia, and the Northern Territory do not observe DST.
DST stands for Daylight Saving Time.
