GMT to JST Time Converter
About this conversion
JST is Japan Standard Time (UTC+9). Japan does not use daylight saving, so JST is the same all year, nine hours ahead of GMT.
When the time difference changes
Both sides keep a fixed offset, so the gap does not change in the next two years.
Best time to call or meet
GMT and JST have no shared 09:00 to 17:00 working hours at present.
Common times
- 06:00 GMT = 15:00 JST
- 09:00 GMT = 18:00 JST
- 12:00 GMT = 21:00 JST
- 15:00 GMT = 00:00 JST (next day)
- 17:00 GMT = 02:00 JST (next day)
- 20:00 GMT = 05:00 JST (next day)
GMT to JST hour-by-hour table
Highlighted rows fall within 09:00 to 17:00 on both sides.
| GMT | JST |
|---|---|
| 00:00 | 09:00 |
| 01:00 | 10:00 |
| 02:00 | 11:00 |
| 03:00 | 12:00 |
| 04:00 | 13:00 |
| 05:00 | 14:00 |
| 06:00 | 15:00 |
| 07:00 | 16:00 |
| 08:00 | 17:00 |
| 09:00 | 18:00 |
| 10:00 | 19:00 |
| 11:00 | 20:00 |
| 12:00 | 21:00 |
| 13:00 | 22:00 |
| 14:00 | 23:00 |
| 15:00 | 00:00 (next day) |
| 16:00 | 01:00 (next day) |
| 17:00 | 02:00 (next day) |
| 18:00 | 03:00 (next day) |
| 19:00 | 04:00 (next day) |
| 20:00 | 05:00 (next day) |
| 21:00 | 06:00 (next day) |
| 22:00 | 07:00 (next day) |
| 23:00 | 08:00 (next day) |
Related conversions
Clock change guides
- What Is Daylight Saving Time (DST)? A Plain-English GuideWhat daylight saving time is, how it works in the UK, Europe and the US, why it exists, its history, who uses it and the argument over scrapping it.
- Why Do the Clocks Go Back in October? The Real ReasonThe clocks go back in autumn to return the UK to GMT, so winter mornings are lighter. The history, the rule, what time it happens and what changes for you.
- When Do the Clocks Go Forward Again After Going Back?When the UK clocks go forward again after the autumn change, how long the UK stays on GMT, when evenings get lighter and how to remember to reset your clocks.
Frequently asked questions
What is 15:00 GMT in JST?
15:00 GMT is 00:00 (next day) JST at the moment. The answer can change by an hour when either side changes its clocks.
What are the shared working hours for GMT and JST?
GMT and JST have no shared 09:00 to 17:00 working hours at present.
When does the GMT to JST time difference change?
It does not change in the next two years.