Time Difference: London and Singapore
Singapore is 8 hours ahead of London in winter and 7 hours ahead in summer. 9:00 AM in London is 5:00 PM in Singapore on GMT and 4:00 PM on BST.
Adding 8 or 7 to London Time
Singapore is UTC+8 all year and doesn't change its clocks. London is UTC+0 in winter and UTC+1 in summer, so Singapore leads by 8 hours in the cold months and 7 in the warm ones, and the UK clock change is the only moving part.
2:00 PM in London is 10:00 PM in Singapore on GMT and 9:00 PM on BST, so a London afternoon is already Singapore's late evening. 5:00 PM in London is 1:00 AM the next day in Singapore in winter, so anything you send at the end of the London day arrives on Singapore's tomorrow.
One Shared Hour in Summer, None in Winter
Two 9-to-5 days almost don't meet. On GMT the gap is 8 hours, so London's 9:00 AM start is Singapore's 5:00 PM close and there's no real overlap. On BST you get one hour: 9:00 to 10:00 AM in London is 4:00 PM to 5:00 PM in Singapore.
| London | Singapore (GMT → SGT) | Singapore (BST → SGT) |
|---|---|---|
| 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 → SGT: no shared working hours.
- BST → SGT: 1 hour shared, 9:00 AM to 10:00 AM London time.
In winter the practical fix is an early London start, with 8:00 to 9:00 AM there at 4:00 PM to 5:00 PM in Singapore.
London to Singapore Conversion Table
Each column is one real season of the London-Singapore gap. Pick the column that matches your date.
| 🇬🇧 London (GMT) | 🇸🇬 Singapore (GMT → SGT) | 🇸🇬 Singapore (BST → SGT) |
|---|---|---|
| 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 → SGT: last Sunday in October to last Sunday in March, while the UK is on GMT
- BST → SGT: 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.
Series Stored in Singapore Time
A series stored in Singapore time drifts on London's calendar. A 4:00 PM Singapore call is 8:00 AM in London in winter and 9:00 AM in summer. Name the city, add both local times to the invite, and pay extra attention to the weeks after each UK clock change.
A Monthly Planning Call
Take a monthly planning call that London wants to run with Singapore. A 9:00 AM London start is 5:00 PM in Singapore on GMT and 4:00 PM on BST. A 10:00 AM start is 6:00 PM on GMT and 5:00 PM on BST, which in winter is already past Singapore's close.
Starting earlier in the London day helps Singapore. 8:00 AM London is 4:00 PM in Singapore on GMT, with an hour left in the Singapore day.
If Singapore hosts at 3:00 PM, London joins at 7:00 AM on GMT and 8:00 AM on BST. Because London's clocks move, a call fixed in Singapore time drifts on the London calendar in March and October.