2025 time change dates for New South Wales, Australia
At 2:00 AM the clocks jump straight to 3:00 AM in New South Wales, Australia. That hour never happens, and everyone loses an hour of sleep.
At 3:00 AM the clocks return to 2:00 AM, so that hour is lived through twice and the night is an hour longer.
New South Wales, Australia keeps AEST in winter and shifts one hour forward for the summer.
Countdown to the next change
Health Considerations for New South Wales, Australia Residents
The spring transition is the one that hurts. A study in Open Heart found the risk of heart attack rose by about 24% on the Monday after clocks went forward, before falling back to normal within the week. Research published in Current Biology found a 6% rise in fatal traffic accidents in the week following the spring change, with the effect strongest in the morning and in the western parts of time zones.
The autumn change, when most people gain an hour, shows no comparable spike. Researchers attribute the difference to sleep loss rather than to the clock change itself.
Technology and Time Changes in 2025
Phones, computers and anything else that syncs with an internet time server handle the transition on their own. What still catches people out in New South Wales, Australia is the long tail of devices that don't: car dashboards, ovens and microwaves, wall clocks, older thermostats, and cheap alarm clocks with a DST setting hard-coded to a schedule that has since changed.
For anyone running servers, the transitions are a recurring source of bugs — duplicated or missing local timestamps around the changeover, cron jobs that fire twice or not at all, and stale operating system timezone databases. Storing timestamps in UTC and keeping the tzdata package current avoids almost all of it.
Background
- The Energy Policy Act of 2005 extended US DST by four weeks starting in 2007, moving the start to the second Sunday in March and the end to the first Sunday in November.
- The energy case for DST is weak by modern standards. A US Department of Energy study in 2008 found savings of about 0.5% of daily electricity use, and other studies have found no saving at all.
- Arizona and Hawaii are the only US states that skip DST statewide, along with the territories of Puerto Rico, Guam, American Samoa and the US Virgin Islands.
Tips for New South Wales, Australia
Check and replace smoke detector batteries when changing clocks - it's a good reminder!
Update your car clock, microwave, and other manual clocks that don't auto-update.
Consider the time change when scheduling meetings with people in other time zones.
Be extra cautious driving the Monday after the spring time change - accident rates increase.
Frequently asked questions
When do the clocks change in New South Wales, Australia in 2025?
Clocks go forward on Sunday, October 5, 2025 and back on Sunday, April 6, 2025.
Which way do the clocks go?
"Spring forward, fall back" is the usual mnemonic: forward one hour in spring, back one hour in autumn.
Do I have to change anything myself?
Phones, computers and anything that syncs over the internet update on their own. Car clocks, ovens, microwaves and older wall clocks generally do not.
Is Daylight Saving Time being scrapped?
It has been proposed in many places and adopted in few. The European Parliament voted in 2019 to end mandatory clock changes and the change has stalled; in the United States the Sunshine Protection Act has repeatedly passed the Senate without becoming law. Most of the world that changes its clocks is still changing them.