Daylight Saving Time Australia: Are the clocks going back and forth on Sundays?

Summer is approaching! Summer time begins Sunday

  • Summer time begins at 2 a.m. Sunday, October 3, 2021; this weekend
  • Clocks move forward an hour and get an hour of sunlight in the evening
  • Only observed in NSW, Victoria, South Australia, Tasmania and ACT
  • Experts say summer time can disrupt sleep cycles for a week or longer
  • Encourages to end time change due to health concerns associated with daylight saving time


Summer time is about to begin for Australians in NSW, Victoria, South Australia, Tasmania and ACT as clocks move forward this weekend.

Residents get an hour of sunlight in the evening, as summer time starts in the early hours on Sunday, October 3, when the clocks move an hour ahead.

They will also lose an hour of morning sun when it starts from 2am AEDT.

Western Australia, Queensland and the Northern Territory do not comply with summer time.

Summer time starts at  02.00 on Sunday 3 October 2021 for NSW, TAS, ACT, SA and VIC

Summer time starts at 02.00 on Sunday 3 October 2021 for NSW, TAS, ACT, SA and VIC

During this six-month summer period, the country is divided into five time zones.

Daylight saving time is observed from the first Sunday in October, when clocks turn forward and timed and end on the first Sunday in April, when clocks go one hour backwards.

Most smartphones and computers automatically update the time, but other devices such as analog clocks, alarm clocks, cars, and microwaves need to be updated manually.

Some experts warn that the time change of an hour can affect sleep and circadian rhythm longer than just the lost hour overnight.

‘Experimental data suggest a cumulative effect of insomnia lasting for at least the following week and sometimes longer,’ University of Sydney’s School of Physics Dr Sveta Postnova told 7 News.

A recent study by ResMed Sleep Health says that one in four Australians already does not get enough sleep, and almost half of the adult population has difficulty sleeping three or more nights a week.

The clock runs one hour from kl.  14.00, where most smartphones and devices automatically change the time difference.  Other analogue clocks and appliances may need to be changed manually

The clock runs one hour from kl. 14.00, where most smartphones and devices automatically change the time difference. Other analogue clocks and appliances may need to be changed manually

‘Spring ahead may actually present significant sleep problems for some of us,’ said ResMed’s physician Carmel Harrington.

‘We may get another hour of daylight, but our body clock is not as fast in its adjustment, and we find it harder to sleep that hour earlier and have difficulty waking up that hour earlier.’

She recommends waking up and going to bed earlier on Saturday to help adjust your body to the time difference and make the bedroom bright to help wake up.

When he was called the world’s leading authority on summer time, Dr. David Prerau that it can promote better physical health and help reduce street crime.

Residents in the areas that observe daylight saving time receive one hour of sunlight in the evening, but lose one hour of sunlight in the morning

Residents of the areas that observe daylight saving time receive one hour of sunlight in the evening, but lose one hour of sunlight in the morning

‘(It will) reduce energy consumption, increase economic activity and give most people a better quality of life,’ ‘Prerau told AAP last year.

Despite these benefits, some medical experts have called for scrapping summer time with concerns that turning the clocks forward could have a negative impact on health.

Paul Zimmet, a professor at Melbourne at the Monash University Department of Diabetes, raised concerns that the health risks associated with losing an hour of sleep as clocks move forward could be exacerbated by the Covid-19 pandemic.

‘In terms of the scientific evidence that we want to hold on to at the moment, there are more heart attacks right after summer time, more traffic accidents, and then you have work accidents, car accidents and their consequences,’ he told 3AW last year.

Daylight saving time was first introduced in some parts of the world during the First World War with the idea that it would save fuel by using less electricity.

Research has shown that any influence summer time has on energy consumption is negligible.

Experts say summer time can disrupt sleep cycles for a week or longer, and some call for ending the change to summer time due to health concerns associated with the clock ahead

Experts say summer time can disrupt sleep cycles for a week or longer, and some call for ending the change to summer time due to health concerns associated with the clock ahead

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