London to Sydney
+9hLondon
BSTSOURCESydney
AESTGreen rows indicate typical business hours (9 AM - 5 PM)
BST and AEST on the World Map
The map below highlights the BST (Greenwich Mean Time) and AEST (Australian Eastern Standard Time) timezone regions across the globe.
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.
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.
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.
Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.
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.
Understanding the +9h Gap: London vs Sydney
London runs on British Summer Time (BST) at UTC+01:00, currently observing daylight saving time. Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts London 9 hours ahead of Sydney — a difference of +9h at the current offsets.
In practice, when it is 9:00 AM in London it is 6:00 PM in Sydney. Midnight in London is 9:00 AM in Sydney.London observes daylight saving time while Sydney does not, so the gap narrows or widens by an hour part of the year.
London to Sydney time conversion table
| London (BST) | Sydney (AEST) | Day |
|---|---|---|
| 12:00 AM | 9:00 AM | same day |
| 6:00 AM | 3:00 PM | same day |
| 7:00 AM | 4:00 PM | same day |
| 8:00 AM | 5:00 PM | same day |
| 9:00 AM | 6:00 PM | same day |
| 12:00 PM | 9:00 PM | same day |
| 3:00 PM | 12:00 AM | next day |
| 5:00 PM | 2:00 AM | next day |
| 6:00 PM | 3:00 AM | next day |
| 9:00 PM | 6:00 AM | next day |
Why people convert London to Sydney time
- Scheduling a call from London to Sydney: a 10:00 AM start in London lands at 7:00 PM in Sydney, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +9h gap: London and Sydney have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in Sydney is 6:00 PM in London.
- Watching a live event or market open: London viewers need 6:00 PM in Sydney to catch a 9:00 AM start there, and 3:00 PM if the event is anchored to London.
- Always state the zone abbreviation, not just the hour. "3:00 PM BST" is unambiguous; "3 PM" across a +9h gap is not.
- With a +9h gap there is no shared 9-to-5 window, so alternate the early start: one week London takes the early slot, the next week Sydney does.
- London: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +9h gap.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Any meeting series spanning that date will shift by an hour in local time.
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.
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.
Best time to call between London and Sydney
With a +9h offset there is no overlap inside a normal 9 AM – 5 PM day. Sydney opens at 9:00 AM AEST, which is 6:00 PM in London, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
London and Sydney have no shared working hours because of the +9h gap. Teams need to alternate early starts or rely on asynchronous handovers.
London is 9 hours ahead of Sydney (BST UTC+01:00 → AEST UTC+10:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Sydney
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 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 London and Sydney?
London (BST, UTC+01:00) is 9 hours ahead of Sydney (AEST, UTC+10:00). The gap is currently +9h.
How do I convert London time to Sydney time?
Add +9h to London local time. For example, 9:00 AM in London is 6:00 PM in Sydney.
What time is it in Sydney right now?
Sydney uses AEST at UTC+10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +9h offset from London.
What is the best time to call Sydney from London?
There is no shared working-hours window because of the +9h gap. The closest option is 1:00 PM in London, which is 10:00 PM in Sydney.
Which is ahead, London or Sydney?
London is 9 hours ahead of Sydney. When it is 12:00 PM in London it is 9:00 PM in Sydney.
Do London and Sydney use different time zones?
London (UK) uses BST at UTC+01:00, while Sydney (Australia) uses AEST at UTC+10:00. The IANA identifiers are Europe/London and Australia/Sydney.
Does daylight saving time affect the London–Sydney difference?
Yes at the moment: London is on daylight saving time and Sydney is not, so the +9h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share London's time zone?
BST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.
Which countries use BST, London's zone?
BST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.
Is there a day difference between London and Sydney?
Not normally. The +9h gap only pushes the date over for late-evening times.
What is the time difference between London and Sydney?
Sydney is +9h from London.
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 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 are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
What is the best time to schedule a call between London and Sydney?
The best overlap for a call is when both cities are in business hours. London works 9:00 AM - 5:00 PM GMT and Sydney works 9:00 AM - 5:00 PM AEST (+9h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in London and Sydney?
London uses GBP (£) while Sydney uses AUD (A$). Check current exchange rates when planning travel or business between these cities.
How do London and Sydney compare in size?
London has a population of approximately 8.8 million (metro: 14.8 million), while Sydney has approximately 5.4 million (metro: 5.4 million).
What are the major landmarks in London and Sydney?
London is known for Big Ben, Tower Bridge, Buckingham Palace. Sydney is famous for Sydney Opera House, Sydney Harbour Bridge, Bondi Beach.
Do London and Sydney have stock exchanges?
Yes. London has the LSE (London Stock Exchange) and Sydney has the ASX (Australian Securities Exchange). The +9h time difference affects trading hour overlaps between these exchanges.
Which countries use GMT (Greenwich Mean Time)?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.
Does GMT observe daylight saving time?
Yes, GMT switches to BST during summer months.
What are some interesting facts about GMT?
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.
Which cities are in the AEST timezone?
Major cities in the AEST timezone include Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
What is the UTC offset for AEST?
Australian Eastern Standard Time (AEST) is at UTC+10:00. During daylight saving time, it shifts to AEDT.
What should I know about the AEST timezone?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
When is it midnight in London, what time is it in Sydney?
When it is 12:00 AM (midnight) in London (GMT), it is +9h later in Sydney (AEST).
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