IST to GMT: IST is 5 hours 30 minutes ahead of GMT
India Standard Time is 5 hours 30 minutes ahead of Greenwich Mean Time, on every day of the year. It is 1:43 am IST in India and 8:13 pm GMT in GMT, which is already the previous day there.
Convert a specific time from IST to GMT
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 GMT?
Greenwich Mean Time is 5 hours 30 minutes behind India Standard Time. To go from IST to GMT you subtract 5 hours 30 minutes. That gap holds on all 365 days of 2026: neither zone moves its clocks.
IST to GMT conversion table
Every hour of Thursday, September 24, 2026 in India, with the matching reading in GMT. 6 of the 24 hours land on a different calendar date in GMT, which is the part people get wrong when they schedule across this pair.
| IST | IST 24h | GMT | GMT 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 6:30 pm | 18:30 | the previous day |
| 1:00 am | 01:00 | 7:30 pm | 19:30 | the previous day |
| 2:00 am | 02:00 | 8:30 pm | 20:30 | the previous day |
| 3:00 am | 03:00 | 9:30 pm | 21:30 | the previous day |
| 4:00 am | 04:00 | 10:30 pm | 22:30 | the previous day |
| 5:00 am | 05:00 | 11:30 pm | 23:30 | the previous day |
| 6:00 am | 06:00 | 12:30 am | 00:30 | same day |
| 7:00 am | 07:00 | 1:30 am | 01:30 | same day |
| 8:00 am | 08:00 | 2:30 am | 02:30 | same day |
| 9:00 am | 09:00 | 3:30 am | 03:30 | same day |
| 10:00 am | 10:00 | 4:30 am | 04:30 | same day |
| 11:00 am | 11:00 | 5:30 am | 05:30 | same day |
| 12:00 pm | 12:00 | 6:30 am | 06:30 | same day |
| 1:00 pm | 13:00 | 7:30 am | 07:30 | same day |
| 2:00 pm | 14:00 | 8:30 am | 08:30 | same day |
| 3:00 pm | 15:00 | 9:30 am | 09:30 | same day |
| 4:00 pm | 16:00 | 10:30 am | 10:30 | same day |
| 5:00 pm | 17:00 | 11:30 am | 11:30 | same day |
| 6:00 pm | 18:00 | 12:30 pm | 12:30 | same day |
| 7:00 pm | 19:00 | 1:30 pm | 13:30 | same day |
| 8:00 pm | 20:00 | 2:30 pm | 14:30 | same day |
| 9:00 pm | 21:00 | 3:30 pm | 15:30 | same day |
| 10:00 pm | 22:00 | 4:30 pm | 16:30 | same day |
| 11:00 pm | 23:00 | 5:30 pm | 17:30 | same day |
What are the best hours to schedule a call between IST and GMT?
2 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 3:00 pm IST to 5:00 pm IST. In GMT that window reads 9:30 am to 11:30 am. Outside it, one side is either not yet at their desk or already gone.
| IST | GMT | Working hours | Note |
|---|---|---|---|
| 3:00 pm | 9:30 am | both sides | afternoon in India, mid morning in GMT |
| 4:00 pm | 10:30 am | both sides | afternoon in India, mid morning in GMT |
Does daylight saving change IST to GMT?
India Standard Time does not move its clocks at all, so its UTC+5:30 offset holds every day of the year.
Greenwich Mean Time does not move its clocks at all, so its UTC+0 offset holds every day of the year.
Is IST ahead of or behind GMT?
IST is ahead of GMT by 5 hours 30 minutes: when it is 12:00 pm in India, it is 6:30 am in GMT. Neither India Standard Time nor Greenwich Mean 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. Greenwich Mean Time covers identical to UTC as a clock reading, and a separate thing as a standard. The identifiers behind them are Asia/Kolkata and Etc/GMT, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is IST in GMT?
- IST is 5 hours 30 minutes ahead of GMT. 9:00 am IST is 3:30 am GMT.
- How many hours ahead is GMT of IST?
- GMT is 5 hours 30 minutes behind IST.
- What time is it in GMT right now?
- 8:13 pm GMT on Wednesday, September 23, 2026.
- When can India and GMT meet during working hours?
- Between 3:00 pm and 5:00 pm IST, which is 9:30 am to 11:30 am GMT.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so IST and GMT are the abbreviations genuinely in force today rather than a fixed assumption.
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