Sydney to London
-11hSydney
AESTSOURCELondon
GMTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and GMT on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and GMT (Greenwich Mean Time) timezone regions across the globe.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •Queensland does not observe daylight saving time, staying on AEST year-round.
- •Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
- •The Australian Securities Exchange (ASX) operates on AEST/AEDT.
- •AEST is 15 hours ahead of EST during winter.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
- •The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
- •GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
- •Iceland uses GMT year-round and never observes daylight saving time.
- •The UK switches from GMT to BST (British Summer Time) in late March each year.
About Sydney
WikipediaSydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
Sydney is one of the first major cities to welcome the New Year.
About London
WikipediaLondon, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
Greenwich Mean Time (GMT) is defined by the Prime Meridian at the Royal Observatory in Greenwich, London.
Comparing Time Zones: Sydney and London
Sydney, Australia operates on the Australian Eastern Standard Time (UTC+10:00). London, UK uses Greenwich Mean Time (UTC+00:00).
The time difference between Sydney and London is 660 minutes (+11h). When it's noon in Sydney, it's 01:00 AM in London.
Why Convert Sydney to London Time?
Navigating the time gap between Sydney and London requires careful planning. With a difference of 11 hours, finding a suitable time for both locations is essential for effective collaboration. This tool simplifies the process, allowing you to instantly see the corresponding time in London.
Best Practice: When proposing meeting times to someone in London, offer a few options in their local time to show consideration for the 11-hour difference.
About AEST (Australian Eastern Standard Time)
Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.
About GMT (Greenwich Mean Time)
Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.
Best Time to Call Between Sydney and London
If you want to reach someone in London during standard business hours (9 AM – 5 PM GMT), the best time to call from Sydney would be:
- London 9:00 AM = Sydney 08:00 PM
- London 12:00 PM = Sydney 11:00 PM
- London 5:00 PM = Sydney 04:00 AM
Business Hours Overlap
Sydney and London have minimal business hours overlap due to the +11h time difference. Teams may need to schedule early morning or late evening meetings for real-time collaboration.
As a final note, managing the -11h difference between Sydney and London is simple with the right tools. Keep this page handy for all your future time conversion needs.
🕐 Daylight Saving Time Info
Sydney
☀ Currently in DST
Standard: UTC+10:00 · DST: UTC+11:00
Clocks fall back on Sat, Apr 4, 2026
London
❄ Currently in Standard Time
Standard: UTC+00:00 · DST: UTC+01:00
Clocks spring forward on Sun, Mar 29, 2026
⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between Sydney and London?
London is -11h from Sydney.
What timezone is Sydney in?
Sydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
What timezone is London in?
London, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
What is the best time to schedule a call between Sydney and London?
The best overlap for a call is when both cities are in business hours. Sydney works 9:00 AM - 5:00 PM AEST and London works 9:00 AM - 5:00 PM GMT (-11h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Sydney and London?
Sydney uses AUD (A$) while London uses GBP (£). Check current exchange rates when planning travel or business between these cities.
How do Sydney and London compare in size?
Sydney has a population of approximately 5.4 million (metro: 5.4 million), while London has approximately 8.8 million (metro: 14.8 million).
What are the major landmarks in Sydney and London?
Sydney is known for Sydney Opera House, Sydney Harbour Bridge, Bondi Beach. London is famous for Big Ben, Tower Bridge, Buckingham Palace.
Do Sydney and London have stock exchanges?
Yes. Sydney has the ASX (Australian Securities Exchange) and London has the LSE (London Stock Exchange). The -11h time difference affects trading hour overlaps between these exchanges.
Which countries use AEST (Australian Eastern Standard Time)?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Does AEST observe daylight saving time?
Yes, AEST switches to AEDT during summer months.
What are some interesting facts about AEST?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
Which cities are in the GMT timezone?
Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.
What is the UTC offset for GMT?
Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.
What should I know about the GMT timezone?
GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
When is it midnight in Sydney, what time is it in London?
When it is 12:00 AM (midnight) in Sydney (AEST), it is -11h later in London (GMT).
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