AUSTRALIA IN SUMMER
Three zones become five
Half the states change their clocks and half do not, and for a few months Australia has more distinct local times than it has time zones.
Sydney and Brisbane are in the same time zone. For about half the year they also show the same time.
For the other half they are an hour apart, because New South Wales observes daylight saving and Queensland does not.
The winter picture: three zones
| Zone | Offset | Where |
|---|---|---|
| Australian Western | UTC+8 | Perth |
| Australian Central | UTC+10:30 | Adelaide, Darwin |
| Australian Eastern | UTC+10 | Sydney, Melbourne, Brisbane, Hobart |
Note Central at +9:30 — Australia has a half-hour zone of its own, and Eucla on the Western Australian border sits at the extraordinary +8:45.
The summer picture: five
Only New South Wales, Victoria, South Australia, Tasmania and the ACT observe daylight saving. Queensland, Western Australia and the Northern Territory do not.
So in the southern summer:
| Offset | Where |
|---|---|
| UTC+8 | Perth (unchanged) |
| UTC+9:30 | Darwin (unchanged) |
| UTC+10 | Brisbane (unchanged) |
| UTC+10:30 | Adelaide (shifted) |
| UTC+11 | Sydney, Melbourne, Hobart (shifted) |
Five distinct local times across three nominal zones. Sydney and Brisbane — nominally the same zone — are an hour apart for months.
Why Queensland does not
It has voted on it, and said no. A 1992 referendum rejected daylight saving, with the strongest opposition in the state's north and west.
The arguments are the familiar ones for a hot, low-latitude place: the extra evening daylight is not wanted, the mornings become uncomfortably early, and the agricultural and outdoor-working population gains nothing. Queensland is also far enough north that its seasonal daylight variation is modest.
Western Australia has trialled it three times and rejected it each time.
What this means for scheduling
Do not use "AEST" loosely. In the southern summer, Sydney is on AEDT (UTC+11) and Brisbane is still on AEST (UTC+10). The abbreviation distinguishes them and most people writing it do not.
Name the city, always. Australia is a country where "same time zone" and "same time" genuinely diverge for months at a stretch.
Remember the hemisphere. Australian clocks go forward in October and back in April — this year 2026-10-03 and 2026-04-04. So while Europe is springing forward, the observing Australian states are falling back, and the gap between them moves by two hours across the year rather than one.
London to Sydney runs 11 hours ahead in the northern winter and 9 hours ahead in the northern summer.
And the overlap is brutal
| Pair | Shared awake window |
|---|---|
| London ↔ Sydney | 08:00–12:59 / 17:00–21:59 (5h) |
| New York ↔ Sydney | 18:00–21:59 / 08:00–11:59 (4h) |
Whatever window exists sits at the extreme edge of somebody's day, and it moves twice a year in both directions.
Related: Time in different countries · Time zone overlap
Timezone: World Clock Widget
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Figures on this page are computed from the IANA time zone database. Last generated 2026-08-18.