Convert Greenwich Mean Time (GMT) to Australian Eastern Daylight Time (AEDT) instantly. View real-time clocks, 11-hour DST difference charts, and scheduling guidelines for Sydney, Melbourne, Canberra, and Hobart.
Greenwich Mean Time stays fixed year-round without daylight saving adjustments.
Australian Eastern Daylight Time is active from the first Sunday in October to the first Sunday in April.
Seasonal Note: Outside the Australian daylight saving window (April to October), southeastern Australia operates on AEST (UTC+10), reducing the offset to +10 hours.
When Australian Eastern Daylight Time is in effect, AEDT is exactly 11 hours ahead of GMT. Because Greenwich Mean Time sits at the 0° longitude Prime Meridian (UTC+0) and AEDT operates at UTC+11, time in southeastern Australia leads Greenwich by nearly half a calendar day.
AEDT Time = GMT Time + 11 Hours
The reference table below displays exact hourly equivalents between GMT and AEDT. Note: This table reflects the 11-hour offset active while AEDT is in effect during Australian daylight saving time.
| GMT Time (UTC+0) | AEDT Time (UTC+11) | Day Indicator |
|---|---|---|
| 12:00 AM | 11:00 AM | Same day |
| 1:00 AM | 12:00 PM | Same day |
| 2:00 AM | 1:00 PM | Same day |
| 3:00 AM | 2:00 PM | Same day |
| 4:00 AM | 3:00 PM | Same day |
| 5:00 AM | 4:00 PM | Same day |
| 6:00 AM | 5:00 PM | Same day |
| 7:00 AM | 6:00 PM | Same day |
| 8:00 AM | 7:00 PM | Same day |
| 9:00 AM | 8:00 PM | Same day |
| 10:00 AM | 9:00 PM | Same day |
| 11:00 AM | 10:00 PM | Same day |
| 12:00 PM | 11:00 PM | Same day |
| 1:00 PM | 12:00 AM (+1 day) | |
| 2:00 PM | 1:00 AM (+1 day) | |
| 3:00 PM | 2:00 AM (+1 day) | |
| 4:00 PM | 3:00 AM (+1 day) | |
| 5:00 PM | 4:00 AM (+1 day) | |
| 6:00 PM | 5:00 AM (+1 day) | |
| 7:00 PM | 6:00 AM (+1 day) | |
| 8:00 PM | 7:00 AM (+1 day) | |
| 9:00 PM | 8:00 AM (+1 day) | |
| 10:00 PM | 9:00 AM (+1 day) | |
| 11:00 PM | 10:00 AM (+1 day) |
When coordinating international calls, live broadcasts, or flight schedules between London/Greenwich and Australia, keep these high-frequency time mappings in mind:
Lunchtime in Sydney & Melbourne, early morning in Greenwich
Early afternoon in AEDT zone
End of Australian workday, early morning in London
Evening relaxation in Australia, start of UK business hours
Late night in Sydney, midday in London
Next calendar day in Australia, mid-afternoon in GMT
Pre-dawn next day in Sydney, evening in Greenwich
Start of next workday in Australia, late night in London
Mid-morning next day in AEDT zone, bedtime in Greenwich
Greenwich Mean Time (GMT) represents mean solar time at the Royal Observatory in Greenwich, London. Positioned at 0° longitude, GMT serves as the international reference baseline (UTC+0) for world time zones. GMT does not observe daylight saving time, remaining constant throughout the year.
Australian Eastern Daylight Time (AEDT) is the daylight saving time zone observed in the southeastern portion of Australia, running at an offset of UTC+11. AEDT is used in key economic hubs including Sydney (New South Wales), Melbourne (Victoria), Hobart (Tasmania), and Canberra (Australian Capital Territory).
It is vital not to confuse AEST with AEDT:
During the summer months, participating eastern states advance their clocks by 1 hour from AEST to AEDT, increasing the time difference from GMT from 10 hours to 11 hours. For more information on Australian time zone structures, consult our Australia Time Zones Guide.
Daylight saving time in participating Australian states begins on the first Sunday in October (clocks spring forward 1 hour at 2:00 AM to 3:00 AM) and ends on the first Sunday in April (clocks fall back 1 hour at 3:00 AM to 2:00 AM).
New South Wales, Victoria, Tasmania, Australian Capital Territory (Sydney, Melbourne, Hobart, Canberra).
Queensland (Brisbane, Gold Coast, Cairns) does not observe DST and remains on UTC+10 year-round.
With an 11-hour gap separating Greenwich Mean Time and Australian Eastern Daylight Time, finding overlapping business hours requires careful planning. The narrowest viable meeting window falls in the early morning for GMT participants and the late afternoon/evening for AEDT participants.
Early morning in London/Greenwich before the standard workday peaks.
Early evening in Sydney/Melbourne — after the Australian business day.
Tip: For recurring weekly meetings, the 8:00 AM GMT / 7:00 PM AEDT slot offers the best balance — a reasonable start for European participants and an acceptable early-evening time for Australian colleagues.
Standard business hours in GMT countries (9:00 AM – 5:00 PM GMT) translate to 8:00 PM – 4:00 AM AEDT, meaning there is zero overlap during core office hours. This makes asynchronous workflows and early/late meeting slots essential for UK–Australia collaboration.
The 2-hour window from 7:00 AM – 9:00 AM GMT (6:00 PM – 8:00 PM AEDT) is the most practical crossover period. Use our Business Hours Overlap Tool to visualise this for your specific teams.
Explore related timezone guides and converters across our platform to streamline global scheduling:
GMT (Greenwich Mean Time) is the zero-offset time baseline (UTC+0) tied to the Prime Meridian in London. AEDT (Australian Eastern Daylight Time) is the daylight saving time zone used in southeastern Australia, running at UTC+11. AEDT is 11 hours ahead of GMT during Australian summer.
Yes. When Australian Eastern Daylight Time is active (from early October to early April), AEDT is exactly 11 hours ahead of Greenwich Mean Time (GMT). For example, 12:00 PM GMT equals 11:00 PM AEDT on the same day.
To convert GMT to AEDT manually, add 11 hours to the GMT time. If the calculated time exceeds 24 hours (12:00 AM midnight), advance the result to the next calendar day. Our interactive converter on this page automatically handles date roll-overs and DST schedules.
Yes. AEDT is only active during the Australian daylight saving period (first Sunday in October to first Sunday in April). Outside this window, southeastern Australia reverts to Australian Eastern Standard Time (AEST, UTC+10), reducing the time gap with GMT to 10 hours.
Sydney operates on GMT+11 (AEDT) during Australian daylight saving time (October through April). During standard winter months (April through October), Sydney observes GMT+10 (AEST).
Because AEDT is 11 hours ahead of GMT, any GMT time after 1:00 PM (13:00) rolls over into the early morning hours of the next calendar day in Australia. For example, 3:00 PM GMT on Monday converts to 2:00 AM AEDT on Tuesday.
AEST (Australian Eastern Standard Time) is the standard winter time zone at UTC+10. AEDT (Australian Eastern Daylight Time) is the summer daylight saving time zone at UTC+11. AEDT is exactly 1 hour ahead of AEST.
Australian Eastern Time is the overarching regional time zone umbrella that encompasses both AEST (UTC+10) in winter and AEDT (UTC+11) in summer for participating eastern states.
New South Wales (including Sydney), Victoria (Melbourne), Tasmania (Hobart), and the Australian Capital Territory (Canberra) observe AEDT. Queensland (Brisbane), Western Australia (Perth), and the Northern Territory do not use AEDT.
No. Brisbane and the state of Queensland do not observe daylight saving time. Queensland stays on AEST (UTC+10) year-round, so Brisbane remains 10 hours ahead of GMT even while Sydney shifts to AEDT (UTC+11).
9:00 AM GMT converts to 8:00 PM AEDT (20:00) on the same day in Sydney and Melbourne during daylight saving time.
6:00 PM GMT converts to 5:00 AM AEDT the following day. Adding 11 hours to 18:00 GMT results in 29:00, which normalizes to 5:00 AM (+1 day).
AEDT starts on the first Sunday in October at 2:00 AM (clocks move forward 1 hour to 3:00 AM) and ends on the first Sunday in April at 3:00 AM (clocks fall back 1 hour to 2:00 AM).
During AEDT (October to April), Melbourne is 11 hours ahead of GMT. During AEST (April to October), Melbourne is 10 hours ahead of GMT.
Yes. Our converter uses the IANA Time Zone Database (Australia/Sydney) to automatically resolve historical and future daylight saving rule changes for any chosen date.
