Sydney is currently 9 hours ahead of London. That gap isn't fixed — it moves between 9, 10 and 11 hours across the year, because the UK and Australia run daylight saving in opposite seasons.
Sydney Time at a Glance
| Detail | Value |
|---|---|
| Time Zone | Australian Eastern Standard Time (AEST) / Australian Eastern Daylight Time (AEDT) |
| UTC Offset | UTC+10 (AEST) or UTC+11 (AEDT) |
| DST | Yes — AEDT runs from the first Sunday in October to the first Sunday in April |
London vs Sydney Through the Year
London runs GMT in winter and BST in summer. Sydney runs AEDT in the southern summer and AEST in the southern winter. Because those seasons are inverted, the gap between the two cities changes four times a year rather than twice.
| Period (2026) | London | Sydney | Gap |
|---|---|---|---|
| 1 Jan – 28 Mar | GMT (UTC+0) | AEDT (UTC+11) | 11 hours |
| 29 Mar – 4 Apr | BST (UTC+1) | AEDT (UTC+11) | 10 hours |
| 5 Apr – 3 Oct | BST (UTC+1) | AEST (UTC+10) | 9 hours |
| 4 Oct – 25 Oct | BST (UTC+1) | AEDT (UTC+11) | 10 hours |
| 26 Oct – 31 Dec | GMT (UTC+0) | AEDT (UTC+11) | 11 hours |
Quick Conversions: London to Sydney
At the current 9-hour gap, the conversions look like this.
| London | Sydney |
|---|---|
| 6:00 | 15:00 |
| 8:00 | 17:00 |
| 9:00 | 18:00 |
| 12:00 | 21:00 |
| 17:00 | 2:00 (next day) |
A 9am London call lands at 6pm in Sydney — late, but workable. Anything after about 10am London is someone's evening.
Sydney vs Other Cities
| City | Offset from Sydney (AEST) |
|---|---|
| London | 9 hours behind |
| New York | 14 hours behind |
| Singapore | 2 hours behind |
| Dubai | 6 hours behind |
| Johannesburg | 8 hours behind |
| Tokyo | 1 hour behind |
The Mistake People Make on This Corridor
The trap is the two short windows in late March and early October when both cities have changed clocks but not in step. For roughly a week each spring and autumn, the gap sits at 10 hours — not the 9 or 11 most people have memorised. Recurring calendar invites set months earlier will silently drift by an hour during those windows, and neither side notices until someone joins an empty call. If you run a standing UK–Australia meeting, check it in the first week of April and the first week of October.
Common Questions
What is the time difference between London and Sydney?
Sydney is 9 hours ahead of London right now. Across the year the gap ranges from 9 to 11 hours, because the UK and Australia observe daylight saving at opposite times.
Is Sydney always 11 hours ahead of the UK?
No. Eleven hours only applies during the UK winter, roughly late October to late March, when London is on GMT and Sydney is on AEDT. For most of the British summer the gap is 9 hours.
What time should I schedule a call with Sydney from the UK?
Between 7am and 9am London time is the reliable window — that's 4pm to 6pm in Sydney. Earlier than 6am London pushes into the Sydney evening, and anything past 10am London means asking someone to take a call after 7pm.
Does Sydney observe daylight saving time?
Yes. Sydney moves to AEDT (UTC+11) on the first Sunday in October and returns to AEST (UTC+10) on the first Sunday in April. Not all of Australia does this — Queensland, the Northern Territory and Western Australia don't change clocks at all.
Zone offsets and changeover dates follow the IANA Time Zone Database. If you want the mechanics of the UK side, see what BST actually is. For the wider region, there's the Singapore to Australia gap, and for standing meetings across offsets, how to schedule across time zones.
Wenya works out the London–Sydney gap for you inside WhatsApp, so nobody has to count hours backwards. Try it at wenyawanna.ai