Time Difference: London and Sydney
Sydney is 10 hours ahead of London (GMT) in standard time.
Daylight saving note: Varies 9–11 hours. The common gap is 9h during UK summer/Sydney standard time and 11h during UK winter/Sydney daylight time. It can briefly be 10h during transition windows when both regions are on daylight time.
The Commonwealth Corridor
London (GMT, UTC+0) and Sydney (AEST, UTC+10) sit 10 hours apart in standard time — but both observe daylight saving in their respective seasons, so the actual gap shifts between 9 and 11 hours depending on time of year. When the UK is on BST (summer), the gap is 9 hours; when Sydney is on AEDT (October–April), it reaches 11 hours from GMT.
The London–Sydney relationship is one of the strongest long-distance Commonwealth connections: Australian banks, law firms, and resource companies all maintain significant London presence, and the financial flows between the two cities require daily coordination across a 10-hour gap.
The most useful fact for scheduling: London's morning is Sydney's evening. When London starts at 9:00 AM GMT, it is 7:00 PM in Sydney. An 8:00 AM London call catches Sydney at 6:00 PM — end of their business day. This makes the early London morning the primary overlap window.
Data point: Approximately 1.3 million Australians hold or have held British ancestry visas — the UK-Australia bilateral relationship is one of the deepest Commonwealth connections, with bilateral trade exceeding A$30 billion annually. Australian High Commission London, 2023
London to Sydney Conversion Table
This reference table uses the baseline offset (+10h). Use the live clocks above for the current offset, especially when daylight saving changes either city.
| 🇬🇧 London (GMT) | 🇦🇺 Sydney (AEST) | Note |
|---|---|---|
| 00:00 | 10:00 | |
| 03:00 | 13:00 | |
| 06:00 | 16:00 | |
| 09:00 | 19:00 | |
| 12:00 | 22:00 | |
| 15:00 | 01:00 | next day |
| 18:00 | 04:00 | next day |
| 21:00 | 07:00 | next day |
* "next day" / "prev day" = the converted time falls on a different calendar date.
Book the 7–9 AM London Window
The best London–Sydney scheduling window is 7:00–9:00 AM London (5:00–7:00 PM Sydney). London starts early; Sydney wraps up their day. Both sides are within acceptable business hours. A 10:00 AM London call is already 8:00 PM in Sydney — after-hours for Australian colleagues. Most London-Sydney firms designate Friday morning London (Thursday evening Sydney) as their weekly sync slot.
Avoiding London-Sydney Time Mistakes
The safest way to use this page is to treat the live clocks and the conversion table as two different tools. The live clocks show what is true right now. The table gives you a quick reference based on the page's stated offset, which is useful for planning but still needs the daylight saving note when the two places change clocks on different dates.
Always check the calendar date when the converted time lands near midnight. A late evening time in London can become the next day in Sydney, and an early morning time can still be the previous day on the other side. That date shift is the part people miss most often when they copy only the clock time into an email or spreadsheet.
For recurring meetings, verify the same slot twice: once in January and once in July. If the answer changes, daylight saving time is involved. Put both local times in the calendar invite, include the timezone abbreviation, and update the invite before the next clock-change week. That is much safer than writing "9 AM your time" and assuming everyone's calendar will interpret it the same way.
If this is a one-off event, use the live clocks above before sending the final time. If you need a custom hour that is not shown in the table, open the related converter or meeting scheduler and enter the exact date and time. That keeps the result tied to the correct timezone rules instead of a memorized offset.
Abbreviations can be slippery, too. ET can mean EST or EDT depending on the season; London can mean GMT or BST; Sydney can mean AEST or AEDT. When accuracy matters, the city name and IANA timezone are safer than the abbreviation alone. This page uses the city timezone for the live clocks, then explains the seasonal abbreviation changes in the note so you can see why the displayed offset may differ from a simple winter table.
Frequently Asked Questions
How many hours ahead is Sydney from London?
Sydney (AEST, UTC+10) is 10 hours ahead of London (GMT, UTC+0) in winter. During UK BST, the gap is 9 hours. When Sydney is on AEDT (UTC+11) and London is on GMT, it reaches 11 hours.
What time is 8 AM London in Sydney?
8:00 AM London (GMT) is 6:00 PM Sydney (AEST). During UK BST, 8:00 AM is 5:00 PM Sydney. The early London morning aligns with the Sydney end-of-day — which is why UK-Australia firms schedule calls for early London mornings.
Is there a good working hours overlap between London and Sydney?
A narrow one. The overlap is roughly 7:00–9:00 AM London (5:00–7:00 PM Sydney). Outside this 2-hour window, one city is outside normal business hours. Teams on this corridor typically hold brief daily syncs at 8:00 AM London / 6:00 PM Sydney.
When is Sydney on AEDT instead of AEST?
New South Wales (Sydney) observes Australian Eastern Daylight Time (AEDT, UTC+11) from the first Sunday of October to the first Sunday of April — the Southern Hemisphere summer. During this period, Sydney is 11 hours ahead of London (GMT) or 10 hours ahead of London (BST).