IST to BST: IST is 4 hours 30 minutes ahead of BST
India Standard Time is 4 hours 30 minutes ahead of UK Time right now. It is 3:37 am IST in India and 11:07 pm BST in UK, which is already the previous day there.
Convert a specific time from IST to BST
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 BST?
UK Time is 4 hours 30 minutes behind India Standard Time. To go from IST to BST you subtract 4 hours 30 minutes. That gap is not fixed. Across 2026 the distance between these two zones takes 2 different values, from 4 hours 30 minutes to 5 hours 30 minutes, because UK moves its clocks and India does not. This page recomputes it rather than assuming.
IST to BST conversion table
Every hour of Friday, September 25, 2026 in India, with the matching reading in UK. 5 of the 24 hours land on a different calendar date in UK, which is the part people get wrong when they schedule across this pair.
| IST | IST 24h | BST | BST 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 7:30 pm | 19:30 | the previous day |
| 1:00 am | 01:00 | 8:30 pm | 20:30 | the previous day |
| 2:00 am | 02:00 | 9:30 pm | 21:30 | the previous day |
| 3:00 am | 03:00 | 10:30 pm | 22:30 | the previous day |
| 4:00 am | 04:00 | 11:30 pm | 23:30 | the previous day |
| 5:00 am | 05:00 | 12:30 am | 00:30 | same day |
| 6:00 am | 06:00 | 1:30 am | 01:30 | same day |
| 7:00 am | 07:00 | 2:30 am | 02:30 | same day |
| 8:00 am | 08:00 | 3:30 am | 03:30 | same day |
| 9:00 am | 09:00 | 4:30 am | 04:30 | same day |
| 10:00 am | 10:00 | 5:30 am | 05:30 | same day |
| 11:00 am | 11:00 | 6:30 am | 06:30 | same day |
| 12:00 pm | 12:00 | 7:30 am | 07:30 | same day |
| 1:00 pm | 13:00 | 8:30 am | 08:30 | same day |
| 2:00 pm | 14:00 | 9:30 am | 09:30 | same day |
| 3:00 pm | 15:00 | 10:30 am | 10:30 | same day |
| 4:00 pm | 16:00 | 11:30 am | 11:30 | same day |
| 5:00 pm | 17:00 | 12:30 pm | 12:30 | same day |
| 6:00 pm | 18:00 | 1:30 pm | 13:30 | same day |
| 7:00 pm | 19:00 | 2:30 pm | 14:30 | same day |
| 8:00 pm | 20:00 | 3:30 pm | 15:30 | same day |
| 9:00 pm | 21:00 | 4:30 pm | 16:30 | same day |
| 10:00 pm | 22:00 | 5:30 pm | 17:30 | same day |
| 11:00 pm | 23:00 | 6:30 pm | 18:30 | same day |
What are the best hours to schedule a call between IST and BST?
3 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 2:00 pm IST to 5:00 pm IST. In UK that window reads 9:30 am to 12:30 pm. Outside it, one side is either not yet at their desk or already gone.
| IST | BST | Working hours | Note |
|---|---|---|---|
| 2:00 pm | 9:30 am | both sides | afternoon in India, mid morning in UK |
| 3:00 pm | 10:30 am | both sides | afternoon in India, mid morning in UK |
| 4:00 pm | 11:30 am | both sides | afternoon in India, mid morning in UK |
Does daylight saving change IST to BST?
India Standard Time does not move its clocks at all, so its UTC+5:30 offset holds every day of the year.
UK Time is currently on BST and changes next on Sunday, October 25, 2026, when the clock falls back from 1:59 am to 1:00 am and the offset moves from UTC+1 to UTC+0.
Because the two sides do not move together, the answer to this conversion changes during the year. For part of the year the gap is 4 hours 30 minutes and for the rest it is 5 hours 30 minutes. The table above is built for today, not for an average day.
Is IST ahead of or behind BST?
IST is ahead of BST by 4 hours 30 minutes: when it is 12:00 pm in India, it is 7:30 am in UK. One wrinkle worth knowing: GMT and BST are two names for the same zone, not two zones. UK Time reads GMT in winter and BST in summer. When somebody types "ist to bst" they nearly always mean the zone rather than the literal winter offset, so this page resolves IST to Asia/Kolkata and BST to Europe/London and applies whichever offset is genuinely in force on the day.
India Standard Time covers the whole of India on a single half hour offset. UK Time covers London, Cardiff, Edinburgh and Dublin. The identifiers behind them are Asia/Kolkata and Europe/London, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is IST in BST?
- IST is 4 hours 30 minutes ahead of BST. 9:00 am IST is 4:30 am BST.
- How many hours ahead is BST of IST?
- BST is 4 hours 30 minutes behind IST. That varies across the year, between 4 hours 30 minutes and 5 hours 30 minutes.
- What time is it in UK right now?
- 11:07 pm BST on Thursday, September 24, 2026.
- When can India and UK meet during working hours?
- Between 2:00 pm and 5:00 pm IST, which is 9:30 am to 12:30 pm BST.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so IST and BST are the abbreviations genuinely in force today rather than a fixed assumption.
Other conversions
12 and 24 hour converter · 8 hours from now · Today · Day counter