AEST — Australian Eastern Standard Time
Australian eastern standard time (UTC+10), AEDT in summer.
AEST stands for Australian Eastern Standard Time. Australian eastern standard time (UTC+10), AEDT in summer.
AEST is UTC+10:00 from Coordinated Universal Time (UTC). The primary IANA zone is Australia/Sydney.
AEST is the standard-time abbreviation; it shifts to AEDT (UTC+11:00) during daylight saving time.
Standard / daylight pair
AEDT · UTC+11 — October–April in ACT, NSW, TAS, and VIC
Countries using this zone
- Australia
Principal cities
- Sydney
- Melbourne
- Brisbane
- Canberra
- Hobart
- Gold Coast
History
The eastern Australian colonies adopted a synchronized standard time in the late 1890s to improve railway and telegraph efficiency. Queensland participated in daylight saving trials during the early 1990s but returned to permanent AEST after a 1992 referendum. Recent IANA updates maintain the synchronized transition rules for the other eastern states on the first Sunday of April and October.
Frequently Asked Questions
AEST — Australian Eastern Standard Time. Australian eastern standard time (UTC+10), AEDT in summer.
AEST is UTC+10:00. It is paired with AEDT (UTC+11:00).
Countries and territories primarily using AEST include: AU.
Yes. Zones using AEST shift to AEDT (UTC+11:00) during daylight saving time and return to AEST when DST ends.
AEST is the winter (standard) abbreviation and AEDT is the summer (daylight-saving) abbreviation. AEDT is one hour ahead of AEST.
The primary IANA time zone representing AEST is Australia/Sydney. Operating systems and programming libraries use this identifier to resolve local time.
Australian Eastern Standard Time (AEST) is the winter time with an offset of UTC+10. Australian Eastern Daylight Time (AEDT) is the summer time with an offset of UTC+11. While New South Wales and Victoria switch between these, Queensland remains on AEST for the entire year without any seasonal clock changes.
AEST is used by the Australian Capital Territory, New South Wales, Victoria, Tasmania, and Queensland. All of these regions use the UTC+10 offset as their standard time. However, only Queensland stays on this offset year-round, while the others advance their clocks by 1 hour during the warmer months.
No, Brisbane and the rest of Queensland do not observe daylight saving time. The state remains on AEST at a constant offset of UTC+10 throughout the year. This results in a 1 hour time difference between Brisbane and Sydney or Melbourne during the summer period when those southern cities move to AEDT.
In regions that observe daylight saving, the transition from AEST to AEDT occurs on the first Sunday of October at around 2 AM local time. The clocks are moved forward by 1 hour. This change affects Sydney, Melbourne, Hobart, and Canberra, but does not apply to Brisbane or other Queensland locations.
Yes, AEST is equivalent to GMT+10 or UTC+10, meaning it is 10 hours ahead of Greenwich Mean Time. When it is midday in London during the winter, it is 10 PM in the AEST zone. This offset is also shared by other regional zones such as Papua New Guinea Time.