JST → GMT Converter
Tokyo to London — same pair, reverse direction. Japanese institutions typically communicate with London counterparts via async or very early Tokyo morning.
JST → GMT
3:40 AM
Japan Standard Time (GMT+9)
Friday, June 12, 2026
UTC+9 (DST active)
7:40 PM
British Summer Time (GMT+1)
Thursday, June 11, 2026
UTC+1 (DST active)
Time Zone Converter
JST·Tokyo
3:40 AM
Friday, June 12, 2026
GMT·London
7:40 PM
Thursday, June 11, 2026
Compare Times
| JST | GMT |
|---|
Morning
| JST | GMT |
|---|---|
| 12:00 AM JST | 3:00 PM GMT |
| 1:00 AM JST | 4:00 PM GMT |
| 2:00 AM JST | 5:00 PM GMT |
| 3:00 AM JST | 6:00 PM GMT |
| 4:00 AM JST | 7:00 PM GMT |
| 5:00 AM JST | 8:00 PM GMT |
| 6:00 AM JST | 9:00 PM GMT |
| 7:00 AM JST | 10:00 PM GMT |
| 8:00 AM JST | 11:00 PM GMT |
| 9:00 AM JST | 12:00 AM GMT |
| 10:00 AM JST | 1:00 AM GMT |
| 11:00 AM JST | 2:00 AM GMT |
Afternoon
| JST | GMT |
|---|---|
| 12:00 PM JST | 3:00 AM GMT |
| 1:00 PM JST | 4:00 AM GMT |
| 2:00 PM JST | 5:00 AM GMT |
| 3:00 PM JST | 6:00 AM GMT |
| 4:00 PM JST | 7:00 AM GMT |
Evening
| JST | GMT |
|---|---|
| 5:00 PM JST | 8:00 AM GMT |
| 6:00 PM JST | 9:00 AM GMT |
| 7:00 PM JST | 10:00 AM GMT |
| 8:00 PM JST | 11:00 AM GMT |
| 9:00 PM JST | 12:00 PM GMT |
| 10:00 PM JST | 1:00 PM GMT |
| 11:00 PM JST | 2:00 PM GMT |
Frequently Asked Questions: JST to GMT
What is the time difference between Japan Standard Time and UK Time?
GMT is 9 hours behind JST (standard time).
What time is midnight in JST in GMT?
Midnight (12:00 AM) in Japan Standard Time translates to 3:00 PM GMT in UK Time.
When do business hours overlap between JST and GMT?
Standard 9–5 business hours do not overlap between Japan Standard Time and UK Time. The closest scheduling window is 18:00–19:00 JST (09:00–10:00 GMT).
Common Time Conversions
EST · New York →
CST · Chicago →
MST · Denver →
PST · Los Angeles →
AKST · Anchorage →
HST · Honolulu →
UTC · Universal →
GMT · London →
IST · New Delhi →
CET · Paris →
How Time Zone Conversion Works
Time zone conversion works by comparing the UTC offset of one location to another. Every city or region is measured relative to Coordinated Universal Time (UTC), which acts as the global reference point for civil time.
GMT is 9 hours behind JST (standard time).
Daylight Saving Time: GMT observes DST; JST does not. The offset between them shifts by 1 hour twice a year — in spring and autumn — when GMT changes its clocks.
Best time to call London from Tokyo
Planning a remote meeting or international call? The optimal business hours overlap between Tokyo and London is challenging, with few shared business hours between the two zones.
Try Meeting Planner for multi-city group scheduling →JST
18:00–19:00
Japan Time
GMT
09:00–10:00
Greenwich Time
Recommended time: 18:00 JST / 09:00 GMT
DST schedule for 2026
Current-year daylight saving start and end dates for the selected zones.
JST · Japan Time
Standard offset +09:00
Japan Time remains on a constant standard offset for the year.
Japan has not observed daylight saving time since 1951.
GMT · Greenwich Time
Standard offset +00:00
- Starts
- Mar 29, 2026 · 01:00 → 02:00
- last_sunday_of_march
- Ends
- Oct 25, 2026 · 02:00 → 01:00
- last_sunday_of_october
- Daylight time
- BST · +01:00
GMT countries vary. The UK, Ireland, and Portugal observe summer time; Iceland and most of West Africa remain on GMT year-round.
Principal Cities
JST — Japan Time
- TokyoJapan
- YokohamaJapan
- OsakaJapan
- NagoyaJapan
GMT — Greenwich Time
- LondonUnited Kingdom
- DublinIreland
- LisbonPortugal
- CasablancaMorocco
Flight Information
Route
NRT ↔ LHR
Avg. flight time
11h
Direct flights
Available
~11h direct flight.