Australian Eastern Daylight Time (AEDT)
UTC offset: +11:00 (during DST)
Standard offset: +10:00 (AEST)
IANA identifier: Australia/Sydney
Abbreviation: AEDT
Population: approximately 14 million (states that observe it)
DST period: First Sunday in October to first Sunday in April
Australian Eastern Daylight Time shifts New South Wales, Victoria, Tasmania, and the Australian Capital Territory one hour forward from AEST (UTC+10:00) to UTC+11:00 during the southern hemisphere summer. This is Australia's most populous time zone, covering Sydney, Melbourne, Canberra, and Hobart. About 60% of Australia's population lives in states that observe AEDT.
Queensland (Brisbane, Gold Coast, Cairns) does NOT participate in DST. This creates the summer split that frustrates Australian business: Sydney is at +11:00 while Brisbane (80 km north of the NSW border) stays at +10:00. Same timezone in winter, one hour apart in summer.
The Queensland Exception
Queensland held a DST referendum in 1992 and voted against it (54.5% no). The state hasn't observed DST since 1972. The reasons are primarily geographic and agricultural:
- Latitude: Queensland stretches from 10S (tropical Far North) to 29S (subtropical border). The north gets virtually no benefit from DST.
- Cattle industry: Dairy farmers argued cows don't adjust to clock changes (an often-mocked but genuinely practical concern for milking schedules)
- Fading curtains: The iconic Queensland argument that extra sunlight fades curtains (probably tongue-in-cheek, but it entered popular culture)
- Heat: Extra evening daylight means extra evening heat exposure in the subtropical north
The SE Queensland border region (Gold Coast/Tweed Heads) suffers most: communities that are functionally one urban area operate on different clocks for five months.
Sydney
Population about 5.4 million (metro). Australia's largest city, built around one of the world's finest natural harbors. The Opera House (1973) and Harbour Bridge (1932) are global icons. The city is Australia's financial center (ASX, major banks), media capital, and primary international gateway (Sydney Airport handles most long-haul flights).
During AEDT, Sydney's extended summer evenings are a major lifestyle feature. Sunset at 8:00-8:15 p.m. in late December. Beaches, outdoor dining, and harbor ferries all benefit from the extra hour.
Melbourne
Population about 5.1 million (metro). Victoria's capital and Australia's second city. Known for arts, sport (Australian Rules Football, Melbourne Cup, Australian Open tennis), coffee culture, laneways, and famously unpredictable weather ("four seasons in one day").
Melbourne and Sydney maintain a fierce rivalry across virtually every metric. The two cities are 1 hour apart by air, 0 hours apart by clock.
Canberra
Population about 460,000. Australia's purpose-built capital (planned by Walter Burley Griffin, opened 1927). Located in the ACT, inland between Sydney and Melbourne. Government employment dominates. National institutions: Parliament House, War Memorial, National Gallery, National Library.
Hobart
Population about 250,000. Tasmania's capital, Australia's second-oldest city (after Sydney). Known for MONA (Museum of Old and New Art), the Salamanca Market, and proximity to wilderness. Tasmania gets the strongest DST benefit in Australia, with summer days reaching ~15 hours at 42.9S latitude.
Scheduling (During AEDT)
At UTC+11:00:
- Adelaide (ACDT, +10:30): 30 minutes behind
- Brisbane (AEST, +10:00): 1 hour behind
- Perth (AWST, +08:00): 3 hours behind
- Auckland (NZDT, +13:00): 2 hours ahead
- Tokyo (+09:00): 2 hours behind
- London (GMT, +00:00): 11 hours behind
Technical Identifiers
- Australia/Sydney (IANA canonical, NSW)
- Australia/Melbourne (IANA, Victoria)
- Australia/Hobart (IANA, Tasmania)
- Australia/Canberra → links to Australia/Sydney
- AEDT (Australian Eastern Daylight Time)
- Windows: "AUS Eastern Standard Time"
- DST: First Sunday October to first Sunday April
Quick Reference
| Attribute | Value |
|---|---|
| UTC offset (summer) | +11:00 |
| UTC offset (winter) | +10:00 |
| DST observed | Yes (NSW, VIC, TAS, ACT) |
| Queensland | Does NOT participate |
| IANA zone | Australia/Sydney |
| Population in AEDT | ~14 million |
| Sydney metro | ~5.4 million |
| Melbourne metro | ~5.1 million |
| Summer sunset (Sydney) | ~8:00 p.m. |