GST to JST: GST is 5 hours behind JST
Gulf Standard Time is 5 hours behind Japan Standard Time, on every day of the year. It is 2:09 pm GST in Gulf and 7:09 pm JST in Japan.
Convert a specific time from GST to JST
Pick any time and date to convert it both ways. The conversion runs in your browser against the real zone rules, so a date inside a daylight saving period gets that period's offset rather than today's.
What is the time difference between GST and JST?
Japan Standard Time is 5 hours ahead of Gulf Standard Time. To go from GST to JST you add 5 hours. That gap holds on all 365 days of 2026: neither zone moves its clocks.
GST to JST conversion table
Every hour of Friday, September 25, 2026 in Gulf, with the matching reading in Japan. 5 of the 24 hours land on a different calendar date in Japan, which is the part people get wrong when they schedule across this pair.
| GST | GST 24h | JST | JST 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 5:00 am | 05:00 | same day |
| 1:00 am | 01:00 | 6:00 am | 06:00 | same day |
| 2:00 am | 02:00 | 7:00 am | 07:00 | same day |
| 3:00 am | 03:00 | 8:00 am | 08:00 | same day |
| 4:00 am | 04:00 | 9:00 am | 09:00 | same day |
| 5:00 am | 05:00 | 10:00 am | 10:00 | same day |
| 6:00 am | 06:00 | 11:00 am | 11:00 | same day |
| 7:00 am | 07:00 | 12:00 pm | 12:00 | same day |
| 8:00 am | 08:00 | 1:00 pm | 13:00 | same day |
| 9:00 am | 09:00 | 2:00 pm | 14:00 | same day |
| 10:00 am | 10:00 | 3:00 pm | 15:00 | same day |
| 11:00 am | 11:00 | 4:00 pm | 16:00 | same day |
| 12:00 pm | 12:00 | 5:00 pm | 17:00 | same day |
| 1:00 pm | 13:00 | 6:00 pm | 18:00 | same day |
| 2:00 pm | 14:00 | 7:00 pm | 19:00 | same day |
| 3:00 pm | 15:00 | 8:00 pm | 20:00 | same day |
| 4:00 pm | 16:00 | 9:00 pm | 21:00 | same day |
| 5:00 pm | 17:00 | 10:00 pm | 22:00 | same day |
| 6:00 pm | 18:00 | 11:00 pm | 23:00 | same day |
| 7:00 pm | 19:00 | 12:00 am | 00:00 | the next day |
| 8:00 pm | 20:00 | 1:00 am | 01:00 | the next day |
| 9:00 pm | 21:00 | 2:00 am | 02:00 | the next day |
| 10:00 pm | 22:00 | 3:00 am | 03:00 | the next day |
| 11:00 pm | 23:00 | 4:00 am | 04:00 | the next day |
What are the best hours to schedule a call between GST and JST?
3 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 9:00 am GST to 12:00 pm GST. In Japan that window reads 2:00 pm to 5:00 pm. Outside it, one side is either not yet at their desk or already gone.
| GST | JST | Working hours | Note |
|---|---|---|---|
| 9:00 am | 2:00 pm | both sides | mid morning in Gulf, afternoon in Japan |
| 10:00 am | 3:00 pm | both sides | mid morning in Gulf, afternoon in Japan |
| 11:00 am | 4:00 pm | both sides | mid morning in Gulf, afternoon in Japan |
Does daylight saving change GST to JST?
Gulf Standard Time does not move its clocks at all, so its UTC+4 offset holds every day of the year.
Japan Standard Time does not move its clocks at all, so its UTC+9 offset holds every day of the year.
Is GST ahead of or behind JST?
GST is behind JST by 5 hours: when it is 12:00 pm in Gulf, it is 5:00 pm in Japan. Neither Gulf Standard Time nor Japan Standard Time observes daylight saving, so the abbreviations never change and the gap between them is fixed.
Gulf Standard Time covers Dubai, Abu Dhabi and Muscat. Japan Standard Time covers Tokyo, Osaka and the whole of Japan. The identifiers behind them are Asia/Dubai and Asia/Tokyo, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is GST in JST?
- GST is 5 hours behind JST. 9:00 am GST is 2:00 pm JST.
- How many hours ahead is JST of GST?
- JST is 5 hours ahead of GST.
- What time is it in Japan right now?
- 7:09 pm JST on Friday, September 25, 2026.
- When can Gulf and Japan meet during working hours?
- Between 9:00 am and 12:00 pm GST, which is 2:00 pm to 5:00 pm JST.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so GST and JST are the abbreviations genuinely in force today rather than a fixed assumption.
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