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GMT to AEST converter

Convert London time to Australian Eastern Time. Sydney is 9 to 11 hours ahead of London, depending on the season.

From
London
To
Sydney
Live
LondonGMT
9:00 AM
 
Working hours
SydneyAEST
8:00 PM
 
Working hours

Sydney is 11 hours ahead of London (GMT vs AEST).

Need a time that works for three or more people or cities? Plan a meeting →
Gap
11 hours
Sydney ahead of London today
Working hours overlap
None
9-to-5 days in London and Sydney do not overlap; use an early or late slot
Next gap change
Mar 28, 2027
The gap becomes 10 hours (London clocks go forward)
9:00 AM GMT
8:00 PM AEST
Sydney is 11 hours ahead of London, as of Nov 6, 2026

Between London and Sydney

London and Sydney are almost on opposite sides of the earth, and because the hemispheres are in opposite seasons, they also move their clocks at different times of the year. The gap varies from 9 hours in July to 11 hours in January.

In practice the working days barely overlap. When London starts at 9 AM, Sydney is at 8 PM (in January) or 6 PM (in July), so most cross-hemisphere calls use London’s early morning and Sydney’s evening.

There is no shared 9-to-5 window, so every call reaches into one side’s early morning or evening.

Calls between teams

The London early morning and Sydney early evening is the shared window.

  • 7:00 AM GMT is 6:00 PM AEDT in January
  • 8:00 AM GMT is 7:00 PM AEDT in January
  • 8:00 AM BST is 5:00 PM AEST in July

In July the window is a little better, as Sydney finishes at 5 PM.

Cricket and rugby

Test cricket between England and Australia runs through the London night.

  • An Ashes start at 11:00 AM AEDT is midnight GMT
  • A rugby international at 8:00 PM AEST is 11:00 AM BST the same day
  • A Sunday final at 3:00 PM AEDT is 4:00 AM GMT

UK fans usually watch with a very early start.

Calls to family and travel

Calls home are easiest in the London evening, which is the Sydney morning.

  • 8:00 PM GMT is 7:00 AM the next day in Sydney
  • 9:00 PM BST is 6:00 AM the next day in Sydney
  • A flight of 22 hours crosses 10 to 11 hours of clock

The date changes for most of the day, so check the weekday.

Australian deadlines in London time

An Australian deadline of 5:00 PM AEDT is 6:00 AM GMT the same day. A deadline at midnight AEDT is 1:00 PM GMT the previous day. UK applicants should aim to finish the day before.

A London deadline of 5:00 PM GMT is 4:00 AM AEDT the next day. Sydney colleagues will read the response at the start of their working morning.

Nine, ten or eleven hours

London changes its clocks on the last Sunday of March and October, Sydney on the first Sunday of April and October. For most of the year the gap is 9 or 11 hours, depending on which side is on summer time, and it is 10 hours in the weeks when both are or neither is.

Dates for 2026–27. Calculated from the IANA time zone database on Nov 6, 2026: today Sydney is 11 hours ahead of London. In northern winter the gap is 11 hours, in northern summer 9 hours. The clock changes ahead are:
  • Mar 28, 2027: London moves to BST (UTC+1); the gap becomes 10 hours
  • Apr 4, 2027: Sydney moves to AEST (UTC+10); the gap becomes 9 hours
  • Oct 3, 2027: Sydney moves to AEDT (UTC+11); the gap becomes 10 hours
  • Oct 31, 2027: London moves to GMT (UTC+0); the gap becomes 11 hours

The result is that nobody on either side can rely on a memorised figure. Use the converter for the date you need.

London to Sydney, every hour

Times are for Nov 6, 2026, when Sydney is 11 hours ahead of London. The gap changes on the dates listed above. Green rows are the hours when both places are inside a 9-to-5 day.

London (GMT)SydneyAEST, +11 hrs
12:00 AM (midnight)11:00 AM
1:00 AM12:00 PM
2:00 AM1:00 PM
3:00 AM2:00 PM
4:00 AM3:00 PM
5:00 AM4:00 PM
6:00 AM5:00 PM
7:00 AM6:00 PM
8:00 AM7:00 PM
9:00 AM8:00 PM
10:00 AM9:00 PM
11:00 AM10:00 PM
12:00 PM (noon)11:00 PM
1:00 PM12:00 AM next day
2:00 PM1:00 AM next day
3:00 PM2:00 AM next day
4:00 PM3:00 AM next day
5:00 PM4:00 AM next day
6:00 PM5:00 AM next day
7:00 PM6:00 AM next day
8:00 PM7:00 AM next day
9:00 PM8:00 AM next day
10:00 PM9:00 AM next day
11:00 PM10:00 AM next day

“next day” and “previous day” mean Sydney is on a different calendar date from London.

Quick answers

What time is 9 AM GMT in Sydney?

8:00 PM AEDT the same day in January, and 6:00 PM AEST in July (reading GMT as London time).

How many hours is Sydney ahead of London?

Between 9 and 11 hours, depending on the season.

What is the best time to call Sydney from London?

Between 7 and 9 AM in London, which is 5 to 8 PM in Sydney.

Why does the gap change?

Because the UK and Australia change their clocks at different times and in opposite seasons.

Is Melbourne the same as Sydney?

Yes. Melbourne and Sydney share the same time.