Offset
The time difference between Belfast and Tokyo is 8 hours.
Belfast (BST) is behind Tokyo (JST).
BST: UTC+1
JST: UTC+9
Belfast is currently observing daylight saving time; Tokyo is not.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Belfast and Tokyo don't overlap on the same weekday. Tokyo is 8 hours ahead of Belfast.
With some flexibility, there’s a workable window outside standard hours:
- 7 AM–12 PM in Belfast (3 PM–8 PM in Tokyo) — suggest 9:00 AM Belfast (5:00 PM Tokyo).
This means an early start or late finish for one side, but it’s a reasonable slot for a one-off meeting.
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
United Kingdom
- Good FridayFri, Apr 3
- Early May Bank HolidayMon, May 4
- Spring Bank HolidayMon, May 25
- Christmas DayFri, Dec 25
- St. Stephen's DayMon, Dec 28
Japan
- New Year's DayThu, Jan 1
- Coming of Age DayMon, Jan 12
- Foundation DayWed, Feb 11
- The Emperor's BirthdayMon, Feb 23
- Vernal Equinox DayFri, Mar 20
- Shōwa DayWed, Apr 29
- Constitution Memorial DayWed, May 6
- Greenery DayMon, May 4
- Children's DayTue, May 5
- Marine DayMon, Jul 20
- Mountain DayTue, Aug 11
- Respect for the Aged DayMon, Sep 21
- Autumnal Equinox DayWed, Sep 23
- Sports DayMon, Oct 12
- Culture DayTue, Nov 3
- Labour Thanksgiving DayMon, Nov 23
About these zones
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Belfast | Tokyo | Day |
|---|---|---|
| 12:00 am | 8:00 am | Same day |
| 1:00 am | 9:00 am | Same day |
| 2:00 am | 10:00 am | Same day |
| 3:00 am | 11:00 am | Same day |
| 4:00 am | 12:00 pm | Same day |
| 5:00 am | 1:00 pm | Same day |
| 6:00 am | 2:00 pm | Same day |
| 7:00 am | 3:00 pm | Same day |
| 8:00 am | 4:00 pm | Same day |
| 9:00 am | 5:00 pm | Same day |
| 10:00 am | 6:00 pm | Same day |
| 11:00 am | 7:00 pm | Same day |
| 12:00 pm | 8:00 pm | Same day |
| 1:00 pm | 9:00 pm | Same day |
| 2:00 pm | 10:00 pm | Same day |
| 3:00 pm | 11:00 pm | Same day |
| 4:00 pm | 12:00 am | +1 day |
| 5:00 pm | 1:00 am | +1 day |
| 6:00 pm | 2:00 am | +1 day |
| 7:00 pm | 3:00 am | +1 day |
| 8:00 pm | 4:00 am | +1 day |
| 9:00 pm | 5:00 am | +1 day |
| 10:00 pm | 6:00 am | +1 day |
| 11:00 pm | 7:00 am | +1 day |
Daylight saving time
Belfast observes daylight saving time; Tokyo does not. The offset between the two zones changes when Belfast transitions: on Sunday, October 25, 2026, clocks fall back from BST to GMT.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 4:50 AM
- Sunset
- 9:57 PM
- Day length
- 17h 6m
- Sunrise
- 4:26 AM
- Sunset
- 6:56 PM
- Day length
- 14h 30m
Daylight overlap: 6h 6m — 4:50 AM–10:56 AM in Belfast (12:50 PM–6:56 PM in Tokyo). Both locations are in daylight during this window.
Cities in these zones
Other cities in Greenwich Mean Time
Other cities in Japan Standard Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Greenwich Mean Time
- LCY
- LGW
- LHR
- LTN
- STN
- BHX
- EMA
- GLA
- PIK
- LBA
Airports in Japan Standard Time
- HND
- NRT
- ITM
- KIX
- UKB
- NGO
- NKM
- CTS
- OKD
- FUK
Related conversions
Common conversions
- What is 9:00 am Belfast in Tokyo?
- 9:00 am Belfast is 5:00 pm Tokyo.
- What is 12:00 pm Belfast in Tokyo?
- 12:00 pm Belfast is 8:00 pm Tokyo.
- What is 12:30 pm Belfast in Tokyo?
- 12:30 pm Belfast is 8:30 pm Tokyo.
- What is 2:00 pm Belfast in Tokyo?
- 2:00 pm Belfast is 10:00 pm Tokyo.
- What is 5:00 pm Belfast in Tokyo?
- 5:00 pm Belfast is 1:00 am Tokyo, the next day.
- What is 11:30 pm Belfast in Tokyo?
- 11:30 pm Belfast is 7:30 am Tokyo, the next day.