IST to JST: IST is 3 hours 30 minutes behind JST
India Standard Time is 3 hours 30 minutes behind Japan Standard Time, on every day of the year. It is 3:38 am IST in India and 7:08 am JST in Japan.
Convert a specific time from IST 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 IST and JST?
Japan Standard Time is 3 hours 30 minutes ahead of India Standard Time. To go from IST to JST you add 3 hours 30 minutes. That gap holds on all 365 days of 2026: neither zone moves its clocks.
IST to JST conversion table
Every hour of Friday, September 25, 2026 in India, with the matching reading in Japan. 3 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.
| IST | IST 24h | JST | JST 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 3:30 am | 03:30 | same day |
| 1:00 am | 01:00 | 4:30 am | 04:30 | same day |
| 2:00 am | 02:00 | 5:30 am | 05:30 | same day |
| 3:00 am | 03:00 | 6:30 am | 06:30 | same day |
| 4:00 am | 04:00 | 7:30 am | 07:30 | same day |
| 5:00 am | 05:00 | 8:30 am | 08:30 | same day |
| 6:00 am | 06:00 | 9:30 am | 09:30 | same day |
| 7:00 am | 07:00 | 10:30 am | 10:30 | same day |
| 8:00 am | 08:00 | 11:30 am | 11:30 | same day |
| 9:00 am | 09:00 | 12:30 pm | 12:30 | same day |
| 10:00 am | 10:00 | 1:30 pm | 13:30 | same day |
| 11:00 am | 11:00 | 2:30 pm | 14:30 | same day |
| 12:00 pm | 12:00 | 3:30 pm | 15:30 | same day |
| 1:00 pm | 13:00 | 4:30 pm | 16:30 | same day |
| 2:00 pm | 14:00 | 5:30 pm | 17:30 | same day |
| 3:00 pm | 15:00 | 6:30 pm | 18:30 | same day |
| 4:00 pm | 16:00 | 7:30 pm | 19:30 | same day |
| 5:00 pm | 17:00 | 8:30 pm | 20:30 | same day |
| 6:00 pm | 18:00 | 9:30 pm | 21:30 | same day |
| 7:00 pm | 19:00 | 10:30 pm | 22:30 | same day |
| 8:00 pm | 20:00 | 11:30 pm | 23:30 | same day |
| 9:00 pm | 21:00 | 12:30 am | 00:30 | the next day |
| 10:00 pm | 22:00 | 1:30 am | 01:30 | the next day |
| 11:00 pm | 23:00 | 2:30 am | 02:30 | the next day |
What are the best hours to schedule a call between IST and JST?
5 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 9:00 am IST to 2:00 pm IST. In Japan that window reads 12:30 pm to 5:30 pm. Outside it, one side is either not yet at their desk or already gone.
| IST | JST | Working hours | Note |
|---|---|---|---|
| 9:00 am | 12:30 pm | both sides | mid morning in India, noon in Japan |
| 10:00 am | 1:30 pm | both sides | mid morning in India, afternoon in Japan |
| 11:00 am | 2:30 pm | both sides | mid morning in India, afternoon in Japan |
| 12:00 pm | 3:30 pm | both sides | noon in India, afternoon in Japan |
| 1:00 pm | 4:30 pm | both sides | afternoon in India, afternoon in Japan |
Does daylight saving change IST to JST?
India Standard Time does not move its clocks at all, so its UTC+5:30 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 IST ahead of or behind JST?
IST is behind JST by 3 hours 30 minutes: when it is 12:00 pm in India, it is 3:30 pm in Japan. Neither India Standard Time nor Japan Standard Time observes daylight saving, so the abbreviations never change and the gap between them is fixed.
India Standard Time covers the whole of India on a single half hour offset. Japan Standard Time covers Tokyo, Osaka and the whole of Japan. The identifiers behind them are Asia/Kolkata and Asia/Tokyo, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is IST in JST?
- IST is 3 hours 30 minutes behind JST. 9:00 am IST is 12:30 pm JST.
- How many hours ahead is JST of IST?
- JST is 3 hours 30 minutes ahead of IST.
- What time is it in Japan right now?
- 7:08 am JST on Friday, September 25, 2026.
- When can India and Japan meet during working hours?
- Between 9:00 am and 2:00 pm IST, which is 12:30 pm to 5:30 pm JST.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so IST and JST are the abbreviations genuinely in force today rather than a fixed assumption.
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