London vs Sydney Time Difference

On 15 July 2026, when London is on British Summer Time and Sydney is on Australian Eastern Standard Time, the gap is 9 hours. By 15 January 2026, with London back on GMT and Sydney on Australian Eastern Daylight Time, it stretches to 11 hours. The two cities sit in opposite hemispheres and advance their clocks on different schedules, so the offset shifts three times a year.

London vs Sydney: The Current Time Difference

The offset is not fixed. Here is the range:

Sydney is always ahead. Converting London to Sydney means adding hours, never subtracting.

Why the Gap Varies: DST in Both Hemispheres

Both cities observe daylight saving, but at opposite times of the year.

London runs on British Summer Time (BST, UTC+1). Clocks go forward on the last Sunday of March and back on the last Sunday of October.

Sydney runs on Australian Eastern Daylight Time (AEDT, UTC+11) in its summer. Clocks go forward in October and back in April.

A narrow window opens roughly April through October when both cities are on standard time relative to their own summer. The difference sits at 9 hours. The rest of the year London is on GMT and Sydney on AEDT: 11 hours.

The transition periods in late March and late October add a wrinkle. For a week or two around each clock change the difference may be 10 hours.

The Difficult Overlap: London Evening, Sydney Early Morning

The London, Sydney overlap is punishing. A London evening (18:00-20:00) catches Sydney’s early morning (04:00-06:00). Real-time conversation is almost impossible for most of the working day.

If you need to reach Sydney from London, the least bad window is London early afternoon (13:00-15:00), which lands in Sydney’s late evening (22:00-00:00, or 23:00-01:00 during the 9-hour gap). Neither side loves it.

Calling from Sydney to London works better: Sydney early morning (07:00-09:00) catches London late evening (18:00-20:00, or 19:00-21:00 during the 9-hour gap). See the best time to call London from Sydney for exact windows.

How to Use the London vs Sydney Time Converter

Pick a date and time in either city. The converter shows the corresponding time in the other and accounts for DST transitions in both hemispheres automatically.

Scheduling a recurring meeting? Check the converter for each month. The difference changes three times per year: the UK’s March and October shifts, and Sydney’s April and October shifts. A meeting that works at 14:00 London in July (23:00 Sydney) becomes 01:00 Sydney in January.

Quick Reference: Time Difference by Month

The shift from 9 to 10 hours happens when London goes back to GMT on 25 October 2026, before Sydney switches to AEDT. The shift from 10 to 11 hours happens when Sydney moves to AEDT on the first Sunday in October 2026.