Time Difference: London and Hong Kong
Hong Kong is 8 hours ahead of London in winter and 7 hours ahead in summer. London at 8:00 AM is 4:00 PM in Hong Kong on GMT and 3:00 PM on BST.
Hong Kong Stays Put, London Moves
Hong Kong is on UTC+8 all year. London is UTC+0 on GMT and UTC+1 on BST, which runs from the last Sunday in March to the last Sunday in October, so the gap is 8 hours in winter and 7 in summer.
6:00 PM in London is 2:00 AM the next day in Hong Kong on GMT and 1:00 AM the next day on BST, well into the night. Going the other way, 10:00 AM in Hong Kong is 2:00 AM in London in winter and 3:00 AM in summer, the London early hours.
London to Hong Kong by Season
Each column is one real season of the London-Hong Kong gap. Pick the column that matches your date.
| 🇬🇧 London (GMT) | 🇭🇰 Hong Kong (GMT → HKT) | 🇭🇰 Hong Kong (BST → HKT) |
|---|---|---|
| 00:00 | 08:00 | 07:00 |
| 03:00 | 11:00 | 10:00 |
| 06:00 | 14:00 | 13:00 |
| 09:00 | 17:00 | 16:00 |
| 12:00 | 20:00 | 19:00 |
| 15:00 | 23:00 | 22:00 |
| 18:00 | 02:00(next day) | 01:00(next day) |
| 21:00 | 05:00(next day) | 04:00(next day) |
- GMT → HKT: last Sunday in October to last Sunday in March, while the UK is on GMT
- BST → HKT: last Sunday in March to last Sunday in October, while the UK is on BST
* "next day" / "prev day" = the converted time falls on a different calendar date.
The Same Arithmetic for Other East Asian Cities
These cities do not change their clocks, so the London gap moves only with the UK:
| City | Ahead of London on GMT / BST |
|---|---|
| Hong Kong (UTC+8) | 8 hours / 7 hours |
| Singapore (UTC+8) | 8 hours / 7 hours |
| Tokyo (UTC+9) | 9 hours / 8 hours |
One Shared Hour, Only in Summer
Two strict 9-to-5 days share nothing in winter and a single hour in summer: London's 9:00 to 10:00 AM on BST, which Hong Kong sees as 4:00 PM to 5:00 PM. In winter the only way to a live call is an early London start, with 8:00 AM there arriving at 4:00 PM in Hong Kong.
| London | Hong Kong (GMT → HKT) | Hong Kong (BST → HKT) |
|---|---|---|
| 8:00 AM | 4:00 PM | 3:00 PM |
| 9:00 AM | 5:00 PM | 4:00 PM ✓ |
| 10:00 AM | 6:00 PM | 5:00 PM |
| 11:00 AM | 7:00 PM | 6:00 PM |
| 12:00 PM | 8:00 PM | 7:00 PM |
| 1:00 PM | 9:00 PM | 8:00 PM |
| 2:00 PM | 10:00 PM | 9:00 PM |
| 3:00 PM | 11:00 PM | 10:00 PM |
| 4:00 PM | 12:00 AM (next day) | 11:00 PM |
| 5:00 PM | 1:00 AM (next day) | 12:00 AM (next day) |
| 6:00 PM | 2:00 AM (next day) | 1:00 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 → HKT: no shared working hours.
- BST → HKT: 1 hour shared, 9:00 AM to 10:00 AM London time.
A standing slot in Hong Kong time moves on London's clock each March and October: 5:00 PM in Hong Kong is 9:00 AM in London in winter and 10:00 AM in summer.
An 8:30 AM London Call With Hong Kong
Calling Hong Kong from London at 8:30 AM lands at 4:30 PM on GMT and 3:30 PM on BST. A 9:30 AM London start is 5:30 PM on GMT and 4:30 PM on BST, which in winter is already after Hong Kong's close.
If Hong Kong hosts at 3:30 PM, London joins at 7:30 AM on GMT and 8:30 AM on BST. A series fixed in Hong Kong time therefore drifts on the London clock in March and October.