Time Difference: London and Sydney
Sydney is 9, 10 or 11 hours ahead of London. 9:00 AM in London is 8:00 PM in Sydney at 11 hours, 7:00 PM at 10 hours and 6:00 PM at 9 hours.
Which Gap Applies
London and Sydney change their clocks in opposite seasons, so Sydney is ahead by 9, 10 or 11 hours:
| Dates | Sydney is ahead by |
|---|---|
| Last Sunday in October to last Sunday in March (GMT and AEDT) | 11 hours |
| Last Sunday in March to first Sunday in April (BST and AEDT) | 10 hours |
| First Sunday in April to first Sunday in October (BST and AEST) | 9 hours |
| First Sunday in October to last Sunday in October (BST and AEDT) | 10 hours |
The two 10-hour stretches are one week in spring and three to four weeks in autumn, the weeks when only one city has changed.
No Shared Working Hours in Any Season
A 9-to-5 day on each side never overlaps, so one side stretches. London's early morning meets Sydney's early evening: 7:00 AM in London is 6:00 PM in Sydney at 11 hours, and 8:00 AM is 5:00 PM at 9 hours. The other option is a London late evening against Sydney's morning: 10:00 PM in London is 9:00 AM the next day in Sydney at 11 hours.
| London | Sydney (GMT → AEDT) | Sydney (BST → AEST) | Sydney (BST → AEDT) |
|---|---|---|---|
| 8:00 AM | 7:00 PM | 5:00 PM | 6:00 PM |
| 9:00 AM | 8:00 PM | 6:00 PM | 7:00 PM |
| 10:00 AM | 9:00 PM | 7:00 PM | 8:00 PM |
| 11:00 AM | 10:00 PM | 8:00 PM | 9:00 PM |
| 12:00 PM | 11:00 PM | 9:00 PM | 10:00 PM |
| 1:00 PM | 12:00 AM (next day) | 10:00 PM | 11:00 PM |
| 2:00 PM | 1:00 AM (next day) | 11:00 PM | 12:00 AM (next day) |
| 3:00 PM | 2:00 AM (next day) | 12:00 AM (next day) | 1:00 AM (next day) |
| 4:00 PM | 3:00 AM (next day) | 1:00 AM (next day) | 2:00 AM (next day) |
| 5:00 PM | 4:00 AM (next day) | 2:00 AM (next day) | 3:00 AM (next day) |
| 6:00 PM | 5:00 AM (next day) | 3:00 AM (next day) | 4:00 AM (next day) |
Each row is an hour of the London day. A check mark means both cities are inside a 9 AM to 5 PM working day at that moment.
- GMT → AEDT: no shared working hours.
- BST → AEST: no shared working hours.
- BST → AEDT: no shared working hours.
London Time in Sydney, Every Hour
Each column is one real season of the London-Sydney gap. Pick the column that matches your date.
| 🇬🇧 London (GMT) | 🇦🇺 Sydney (GMT → AEDT) | 🇦🇺 Sydney (BST → AEST) | 🇦🇺 Sydney (BST → AEDT) |
|---|---|---|---|
| 00:00 | 11:00 | 09:00 | 10:00 |
| 03:00 | 14:00 | 12:00 | 13:00 |
| 06:00 | 17:00 | 15:00 | 16:00 |
| 09:00 | 20:00 | 18:00 | 19:00 |
| 12:00 | 23:00 | 21:00 | 22:00 |
| 15:00 | 02:00(next day) | 00:00(next day) | 01:00(next day) |
| 18:00 | 05:00(next day) | 03:00(next day) | 04:00(next day) |
| 21:00 | 08:00(next day) | 06:00(next day) | 07:00(next day) |
- GMT → AEDT: last Sunday in October to the last Sunday in March, while the UK is on GMT and Sydney on AEDT
- BST → AEST: first Sunday in April to first Sunday in October, while the UK is on BST and Sydney on AEST
- BST → AEDT: a week or so after the UK moves in March, and from the first Sunday in October to the last Sunday in October, when only one side has changed
* "next day" / "prev day" = the converted time falls on a different calendar date.
Sydney Is on the Next Day
5:00 PM in London is 4:00 AM the next day in Sydney at 11 hours and 2:00 AM the next day at 9 hours. 9:00 AM in Sydney is 10:00 PM the previous day in London at 11 hours and 12:00 AM at 9 hours, always the previous day on London's calendar.
Don't use a single number for the whole year. Name the cities and the date in the invite, and check the weeks around both clock changes.
A Monday Morning From London Is Evening in Sydney
A London team that calls Sydney at 8:30 AM reaches 5:30 PM at 9 hours, 6:30 PM at 10 hours and 7:30 PM at 11 hours, all on the same calendar day.
If Sydney hosts at 8:00 AM, London joins at 11:00 PM the previous day at 9 hours and 9:00 PM the previous day at 11 hours, the previous day, so the Sydney morning belongs to the London evening before.