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London to Sydney Time Converter

Sydney is between 9 and 11 hours ahead of London, depending on the time of year. Both cities use daylight saving time, but their summers fall in opposite halves of the year.

BST · UTC+1
Mon, Oct 19
AEDT · UTC+11
Mon, Oct 19

On Monday, October 19, Sydney is 10 hours ahead of London. That’s not the usual 9 hours — here’s why.

Heads-up: clocks in London go back on Sunday, October 25. After that, Sydney is 11 hours ahead of London.

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Time zone rules checked October 2026. The converter runs on your device using its built-in time zone database, so it accounts for daylight saving time on any date you pick.

London and Sydney, hour by hour

Green rows are the hours when both cities are inside an ordinary 9-to-5 working day. Change the date in the converter and this table follows it.

Hour by hour for Monday, October 19, 2026 in London
London BSTSydney AEDTOffice hours (9 AM to 5 PM, local weekdays)
12:00 AM10:00 AMSydney only
1:00 AM11:00 AMSydney only
2:00 AM12:00 PMSydney only
3:00 AM1:00 PMSydney only
4:00 AM2:00 PMSydney only
5:00 AM3:00 PMSydney only
6:00 AM4:00 PMSydney only
7:00 AM5:00 PM
8:00 AM6:00 PM
9:00 AM7:00 PMLondon only
10:00 AM8:00 PMLondon only
11:00 AM9:00 PMLondon only
12:00 PM10:00 PMLondon only
1:00 PM11:00 PMLondon only
2:00 PM12:00 AM next dayLondon only
3:00 PM1:00 AM next dayLondon only
4:00 PM2:00 AM next dayLondon only
5:00 PM3:00 AM next day
6:00 PM4:00 AM next day
7:00 PM5:00 AM next day
8:00 PM6:00 AM next day
9:00 PM7:00 AM next day
10:00 PM8:00 AM next day
11:00 PM9:00 AM next daySydney only

The best time for a call

A 9-to-5 day in London and one in Sydney don’t overlap at all, so somebody has to stretch. The fairest one-hour slot is usually 8:00 AM in London, which is 5:00 PM in Sydney. It asks London to start about an hour early and Sydney to stay about an hour late.

London and Sydney are about as far apart as two big business hubs get: nine to eleven hours depending on the season, with both cities changing their clocks in opposite directions. Somebody will always be outside office hours.

The two usual compromises are the London early morning, which catches the end of Sydney’s day, and the London evening, which is the next morning in Sydney. In the northern winter, 8 a.m. in London is 7 p.m. in Sydney; in the northern summer it’s 5 p.m.

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Why the time difference changes

London and Sydney sit in different hemispheres, so their summers, and their daylight saving seasons, fall at opposite ends of the calendar. London: clocks go forward on the last Sunday in March and back on the last Sunday in October. Sydney: clocks go forward on the first Sunday in October and back on the first Sunday in April.

Each of those four changes moves the gap by an hour, which is why it drifts across a two-hour range during the year.

Sydney compared with London, Oct 19, 2026 to Oct 19, 2027
FromUntilSydney is9:00 AM in London is
TodayOct 25, 202610 hours ahead7:00 PM AEDT
Oct 25, 2026Mar 28, 202711 hours ahead8:00 PM AEDT
Mar 28, 2027Apr 4, 202710 hours ahead7:00 PM AEDT
Apr 4, 2027Oct 3, 20279 hours ahead6:00 PM AEST
Oct 3, 2027—10 hours ahead7:00 PM AEDT

The two time zones

London

Time zone
UK time (GMT / BST)
UTC offset
UTC+0, or UTC+1 in summer
Daylight saving
Clocks go forward on the last Sunday in March and back on the last Sunday in October.
Next change
Oct 25, 2026 (clocks go back)
IANA zone
Europe/London

Sydney

Time zone
Australian Eastern Time (AEST / AEDT)
UTC offset
UTC+10, or UTC+11 in the southern summer
Daylight saving
Clocks go forward on the first Sunday in October and back on the first Sunday in April.
Next change
Apr 4, 2027 (clocks go back)
IANA zone
Australia/Sydney

Common questions

What time is it in Sydney when it’s 9 AM in London?

Anywhere from 6:00 PM to 8:00 PM, depending on the time of year. The table under “Why the time difference changes” lists the exact dates, and the converter gives the answer for any day you pick.

Is Sydney always 9 hours ahead of London?

No. Over the next twelve months it’s 9 hours most of the time, but it changes with the seasons: from now until Oct 25, 2026 (10 hours), Oct 25 until Mar 28, 2027 (11 hours), Mar 28 until Apr 4, 2027 (10 hours) and from Oct 3, 2027 (10 hours). That’s down to daylight saving time, explained above.

What’s a good time for a meeting between London and Sydney?

A 9-to-5 day in London and one in Sydney don’t overlap at all, so somebody has to stretch. The fairest one-hour slot is usually 8:00 AM in London, which is 5:00 PM in Sydney. It asks London to start about an hour early and Sydney to stay about an hour late.

Is Sydney a day ahead of London?

For part of the day, yes. On a typical day, from about 3:00 PM in London onwards it’s already the next day in Sydney. The converter and hour-by-hour table flag this with a “next day” label.

Need more than two cities? The World Time Grid lines up to five locations side by side, so you can see everyone’s day at once.

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