IST to GST: IST is 1 hour 30 minutes ahead of GST
India Standard Time is 1 hour 30 minutes ahead of Gulf Standard Time, on every day of the year. It is 7:48 am IST in India and 6:18 am GST in Gulf.
Convert a specific time from IST to GST
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 GST?
Gulf Standard Time is 1 hour 30 minutes behind India Standard Time. To go from IST to GST you subtract 1 hour 30 minutes. That gap holds on all 365 days of 2026: neither zone moves its clocks.
IST to GST conversion table
Every hour of Friday, September 25, 2026 in India, with the matching reading in Gulf. 2 of the 24 hours land on a different calendar date in Gulf, which is the part people get wrong when they schedule across this pair.
| IST | IST 24h | GST | GST 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 10:30 pm | 22:30 | the previous day |
| 1:00 am | 01:00 | 11:30 pm | 23:30 | the previous day |
| 2:00 am | 02:00 | 12:30 am | 00:30 | same day |
| 3:00 am | 03:00 | 1:30 am | 01:30 | same day |
| 4:00 am | 04:00 | 2:30 am | 02:30 | same day |
| 5:00 am | 05:00 | 3:30 am | 03:30 | same day |
| 6:00 am | 06:00 | 4:30 am | 04:30 | same day |
| 7:00 am | 07:00 | 5:30 am | 05:30 | same day |
| 8:00 am | 08:00 | 6:30 am | 06:30 | same day |
| 9:00 am | 09:00 | 7:30 am | 07:30 | same day |
| 10:00 am | 10:00 | 8:30 am | 08:30 | same day |
| 11:00 am | 11:00 | 9:30 am | 09:30 | same day |
| 12:00 pm | 12:00 | 10:30 am | 10:30 | same day |
| 1:00 pm | 13:00 | 11:30 am | 11:30 | same day |
| 2:00 pm | 14:00 | 12:30 pm | 12:30 | same day |
| 3:00 pm | 15:00 | 1:30 pm | 13:30 | same day |
| 4:00 pm | 16:00 | 2:30 pm | 14:30 | same day |
| 5:00 pm | 17:00 | 3:30 pm | 15:30 | same day |
| 6:00 pm | 18:00 | 4:30 pm | 16:30 | same day |
| 7:00 pm | 19:00 | 5:30 pm | 17:30 | same day |
| 8:00 pm | 20:00 | 6:30 pm | 18:30 | same day |
| 9:00 pm | 21:00 | 7:30 pm | 19:30 | same day |
| 10:00 pm | 22:00 | 8:30 pm | 20:30 | same day |
| 11:00 pm | 23:00 | 9:30 pm | 21:30 | same day |
What are the best hours to schedule a call between IST and GST?
6 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 11:00 am IST to 5:00 pm IST. In Gulf that window reads 9:30 am to 3:30 pm. Outside it, one side is either not yet at their desk or already gone.
| IST | GST | Working hours | Note |
|---|---|---|---|
| 11:00 am | 9:30 am | both sides | mid morning in India, mid morning in Gulf |
| 12:00 pm | 10:30 am | both sides | noon in India, mid morning in Gulf |
| 1:00 pm | 11:30 am | both sides | afternoon in India, mid morning in Gulf |
| 2:00 pm | 12:30 pm | both sides | afternoon in India, noon in Gulf |
| 3:00 pm | 1:30 pm | both sides | afternoon in India, afternoon in Gulf |
| 4:00 pm | 2:30 pm | both sides | afternoon in India, afternoon in Gulf |
Does daylight saving change IST to GST?
India Standard Time does not move its clocks at all, so its UTC+5:30 offset holds every day of the year.
Gulf Standard Time does not move its clocks at all, so its UTC+4 offset holds every day of the year.
Is IST ahead of or behind GST?
IST is ahead of GST by 1 hour 30 minutes: when it is 12:00 pm in India, it is 10:30 am in Gulf. Neither India Standard Time nor Gulf 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. Gulf Standard Time covers Dubai, Abu Dhabi and Muscat. The identifiers behind them are Asia/Kolkata and Asia/Dubai, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is IST in GST?
- IST is 1 hour 30 minutes ahead of GST. 9:00 am IST is 7:30 am GST.
- How many hours ahead is GST of IST?
- GST is 1 hour 30 minutes behind IST.
- What time is it in Gulf right now?
- 6:18 am GST on Friday, September 25, 2026.
- When can India and Gulf meet during working hours?
- Between 11:00 am and 5:00 pm IST, which is 9:30 am to 3:30 pm GST.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so IST and GST are the abbreviations genuinely in force today rather than a fixed assumption.
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