Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Australian Eastern Standard Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
First Sunday in October at 02:00 AM (Clocks advance to AEDT in NSW, VIC, TAS, ACT)
⬇️ Fall Back (Clocks Return)
First Sunday in April at 03:00 AM (Clocks return to AEST)
Observing Jurisdictions & Subdivisions
1 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under AEST:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
The ASX opens at 10:00 AM local time, making it the first major equity exchange to price weekend news and set early sentiment before Tokyo and Hong Kong open.
Local Hours: 10:00 - 16:00 AEST
UTC Window: 23:00 - 06:00 UTC
Major Cities in AEST
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1895
Colonial parliaments legislated standard time in February 1895 based on the 150th meridian east. Notably, Queensland held a daylight saving referendum in 1992 where regional voters rejected summer clock shifts, keeping Brisbane on AEST (UTC+10) all year round.
Because Queensland does not observe daylight saving while New South Wales does, Boundary Street between the twin towns of Coolangatta and Tweed Heads splits the community into two separate time zones each October through April. Locals celebrate New Year's Eve twice in a single evening simply by walking across the road.
Frequently Asked Questions about AEST
What does AEST stand for?
AEST stands for Australian Eastern Standard Time, ten hours ahead of Coordinated Universal Time (UTC+10).
What is the difference between AEST and AEDT?
AEST is winter standard time (UTC+10), while AEDT is summer daylight saving time (UTC+11).
Does Brisbane change clocks for daylight saving?
No. The state of Queensland, including Brisbane, remains on AEST (UTC+10) all twelve months of the year.