AEDT is 11 hours ahead of UTC. AEDT (Australian Eastern Daylight Time) is used during Daylight Saving Time in the Australian Eastern time zone, typically from October to April.

AEDT itself is the daylight saving time version of AEST. AEDT is observed from the first Sunday in October to the first Sunday in April, when the region switches back to AEST (Australian Eastern Standard Time, UTC+10:00). Note that Queensland does not observe DST and remains on AEST year-round.

Cities such as Sydney, Melbourne, Canberra, and Hobart follow AEDT during the summer months. Brisbane, Queensland remains on AEST year-round.

Parts of Australia (New South Wales, Victoria, Tasmania, and the Australian Capital Territory) observe AEDT during daylight saving time.

AEDT is 1 hour ahead of AEST. AEDT (UTC+11:00) is used during summer months, while AEST (UTC+10:00) is used during winter months.

Daylight saving time is observed to make better use of daylight during the longer summer days, potentially reducing energy consumption and allowing for more evening activities. However, Queensland opts out due to concerns about the impact on agriculture and tourism.

AEDT was established as part of the daylight saving time system adopted in Australia, beginning in various states at different times, with the current system standardized in the late 20th century.

Business hours in areas following AEDT are typically from 9:00 AM to 5:00 PM, with a lunch break in the middle of the day.

The Australian Eastern region includes major economic hubs like Sydney (finance and services), Melbourne (manufacturing and culture), and Canberra (government), making it the most economically significant region in Australia.