What is the normal time difference between London and Sydney?

The offset varies by season because both cities observe Daylight Saving Time at opposite times of year. The time difference is +9 hours for most of the northern summer (April to October) and +11 hours in the northern winter (November to March), with +10 hours occurring only during brief transition weeks in October and March/April. This tool always shows the live offset.

When is Sydney ahead by 11 hours?

When London is on GMT (UTC+0) and Sydney is on AEDT (UTC+11) — roughly from late October through late March (UK winter). This is when the gap is largest.

When is Sydney ahead by only 9 hours?

When London is on BST (UTC+1) and Sydney is on AEST (UTC+10) — roughly from April to October (UK summer / Australian winter). This is the shortest gap.

When does Australia DST start and end?

New South Wales (Sydney) moves clocks forward by 1 hour on the first Sunday in October (switching from AEST UTC+10 to AEDT UTC+11) and back on the first Sunday in April.

What are good meeting times for both London and Sydney?

Overlap is very limited due to the large gap. The best window is usually London 07:00–09:00 (Sydney 17:00–19:00 or 18:00–20:00 depending on DST). The meeting overlap finder below highlights any available windows.

Is this tool accurate for scheduling?

Yes. It uses the IANA timezone database embedded in your browser — the same source used by operating systems and calendar apps worldwide. Accuracy depends on your device clock being synchronized via NTP, which most devices do automatically.

Time Difference: London to Sydney

See the current time in London and Sydney side by side, with the exact UTC offset gap and a business-hours overlap finder, updated live every second.

London, United Kingdom

--:--:--

GMT UTC+0

Sydney, Australia

--:--:--

AEST UTC+10

Current Offset

+10 hours

Sydney is 10 hours ahead of London

Meeting Overlap Finder

Business hours (09:00–18:00) highlighted — best overlap shaded

London	Sydney	Status

Convert London Time to Sydney Time

Based on the current offset — updates automatically

London	Sydney

Summary

This tool displays the live current time in both London (Europe/London — GMT in winter, BST in summer) and Sydney (Australia/Sydney — AEST UTC+10 in winter, AEDT UTC+11 in summer) side by side. The exact offset is calculated automatically and adjusts whenever either city transitions for Daylight Saving Time — note that Australia DST runs opposite to the UK (southern hemisphere summer is UK winter). Use it to schedule calls between the UK and Australia, coordinate remote teams, or check whether a Sydney colleague is still in the office.

How it works

Your browser reads the current moment from your device clock.
It converts that moment to Europe/London time using the IANA timezone database built into modern browsers.
The same moment is converted to Australia/Sydney time.
The UTC offsets of both cities are compared to calculate the exact hour difference.
All three values — London time, Sydney time, and the offset — refresh every second.
DST transitions for both cities are handled automatically; Sydney observes DST (AEDT) in the southern hemisphere summer (roughly October–April), while London observes BST in its own summer (March–October).

Use cases

Scheduling video calls between London and Sydney offices.
Checking if a colleague in Sydney is still at their desk.
Planning travel between the UK and Australia and comparing arrival times.
Remote teams coordinating daily standups across a large timezone gap.
Finding rare overlapping business hours for London–Sydney meetings.
Verifying whether both cities currently observe daylight saving time.
Journalists checking broadcast times for live Australian events.
Students and teachers arranging online lessons between the UK and Australia.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu