BST to IST
British Summer Time is 4 hours and 30 minutes behind India Standard Time.
Times may vary due to daylight saving time.Quick answer. IST is 4 hours and 30 minutes ahead of BST, and that gap never changes. Neither BST nor IST observes daylight saving time, so the same conversion is correct on every date of the year.
Time difference
British Summer Time (BST)
BST UTC+1:00 No DST
London, Manchester, Birmingham, Edinburgh, Glasgow.
BST is UTC+1:00 and runs from the last Sunday in March to the last Sunday in October. Outside that window the UK is on GMT, and the gap from India grows by an hour.
India Standard Time (IST)
IST UTC+5:30 No DST
Mumbai, Delhi, Bengaluru, Chennai, Kolkata, Hyderabad.
India runs on a single time zone, UTC+5:30, and has not observed daylight saving time since 1945. The half-hour offset is why IST conversions rarely land on a round hour.
BST to IST conversion table
Every hour of the day for 2026. Neither side observes daylight saving, so this table is correct on every date of the year.
| BST | IST | 24-hour |
|---|---|---|
| 12 AM | 4:30 AM | 04:30 |
| 1 AM | 5:30 AM | 05:30 |
| 2 AM | 6:30 AM | 06:30 |
| 3 AM | 7:30 AM | 07:30 |
| 4 AM | 8:30 AM | 08:30 |
| 5 AM | 9:30 AM | 09:30 |
| 6 AM | 10:30 AM | 10:30 |
| 7 AM | 11:30 AM | 11:30 |
| 8 AM | 12:30 PM | 12:30 |
| 9 AM | 1:30 PM | 13:30 |
| 10 AM | 2:30 PM | 14:30 |
| 11 AM | 3:30 PM | 15:30 |
| 12 PM | 4:30 PM | 16:30 |
| 1 PM | 5:30 PM | 17:30 |
| 2 PM | 6:30 PM | 18:30 |
| 3 PM | 7:30 PM | 19:30 |
| 4 PM | 8:30 PM | 20:30 |
| 5 PM | 9:30 PM | 21:30 |
| 6 PM | 10:30 PM | 22:30 |
| 7 PM | 11:30 PM | 23:30 |
| 8 PM | 12:30 AM +1 day | 00:30 |
| 9 PM | 1:30 AM +1 day | 01:30 |
| 10 PM | 2:30 AM +1 day | 02:30 |
| 11 PM | 3:30 AM +1 day | 03:30 |
Highlighted rows are the 4 hours where a 9–6 working day in BST overlaps a 9–5 working day in IST.
Popular conversion times
| BST | IST |
|---|---|
| 9 AM BST | 1:30 PM |
| 10 AM BST | 2:30 PM |
| 11 AM BST | 3:30 PM |
| 12 PM BST | 4:30 PM |
| 3 PM BST | 7:30 PM |
| 5 PM BST | 9:30 PM |
| 6 PM BST | 10:30 PM |
| 8 PM BST | 12:30 AM+1 day |
Business hours and meeting times
Comparing a 9:00–18:00 working day in BST against 9:00–17:00 in IST, across the whole week — a slot only counts if it lands on a working day at both ends.
Both sides work Monday to Friday, so the working weeks line up and you share 5 days.
Rows are days in BST. Columns are hours of the BST day.
Best recurring slot
11 AM BST = 3:30 PM IST , every shared working day
Across the week that is 15 overlapping working hours . The widest day is Monday, with 3 hours.
| Day | Overlap (BST) | Local (IST) | Hours |
|---|---|---|---|
| Monday | 9 AM – 12 PM | 1:30 PM – 4:30 PM | 3 |
| Tuesday | 9 AM – 12 PM | 1:30 PM – 4:30 PM | 3 |
| Wednesday | 9 AM – 12 PM | 1:30 PM – 4:30 PM | 3 |
| Thursday | 9 AM – 12 PM | 1:30 PM – 4:30 PM | 3 |
| Friday | 9 AM – 12 PM | 1:30 PM – 4:30 PM | 3 |
| Saturday | BST weekend | — | — |
| Sunday | BST weekend | — | — |
Public holidays
A shared working day is only usable if neither side is on holiday — and India and IST build their calendars on different systems, so the days each loses rarely coincide.
Over the next 8 weeks you share 40 working days. 2are lost to a public holiday on one side or the other, leaving 38.
| Date | Who is off | Holiday |
|---|---|---|
| Friday, October 2, 2026 | India | Gandhi Jayanti |
| Tuesday, October 20, 2026 | India | Dussehra (Vijayadashami) |
Next holidays in BST
- Monday, November 30, 2026Saint Andrew's Dayregionalpublished date
- Friday, December 25, 2026Christmas Daypublished date
- Monday, December 28, 2026St. Stephen's Day (Boxing Day)published date
- Friday, January 1, 2027New Year's Dayregionalpublished date
- Saturday, January 2, 20272 Januaryregionalpublished date
Public holidays as published by https://date.nager.at, covering 2026–2028. Regional and employer-specific days are not included.
Next holidays in India
- Friday, October 2, 2026Gandhi Jayantisame date every year
- Tuesday, October 20, 2026Dussehra (Vijayadashami)partialpublished date
- Sunday, November 8, 2026Diwalipublished date
- Monday, November 9, 2026Diwalipublished date
- Friday, December 25, 2026Christmas Daypartialsame date every year
India has three national holidays on which the whole country closes. Everything else is either a central-government gazetted holiday that individual employers choose to observe, or a state holiday. Festival dates follow lunisolar calendars and move every year, so they are listed explicitly rather than derived.
Holiday dates for BST and elsewhere come from a dataset last refreshed on 2026-09-12 (date.nager.at plus curated national calendars). Lunar dates — Eid, Chinese New Year, the Jewish holidays — are predicted and can move by a day once officially announced. Regional, state and employer-specific holidays are not included. Confirm anything you are booking a flight around.
About this conversion
BST is UTC+1:00 and runs from the last Sunday in March to the last Sunday in October. Outside that window the UK is on GMT, and the gap from India grows by an hour.
India runs on a single time zone, UTC+5:30, and has not observed daylight saving time since 1945. The half-hour offset is why IST conversions rarely land on a round hour.
Frequently asked questions
What is the time difference between BST and IST?
IST is 4 hours and 30 minutes ahead of BST, on every date of the year. Neither side observes daylight saving time.
What time is 9 AM BST in IST?
9:00 AM BST is 1:30 PM in IST, all year round.
What is the best time for a meeting between BST and IST?
Working days overlap for about 3 hours on a typical Monday: 9 AM to 12 PM BST, which is 1:30 PM to 4:30 PM in IST. For a recurring invite, 11 AM BST / 3:30 PM IST is the slot that works on the most days.
Does BST observe daylight saving time?
No. BST stays on BST (UTC+1:00) for the whole year, with no daylight saving changeover.
How many hours a week do BST and IST actually overlap?
15 hours across the week, spread over 5 working days. 11 AM BST (3:30 PM IST) is the slot that works on the most days, so it is the one to put in a recurring invite.
Do public holidays in BST and IST line up?
Barely. Over the next eight weeks the two sides share 40 working days, and 2 of those are a public holiday on one side or the other, leaving 38. The next holiday in IST is Gandhi Jayanti on 2026-10-02. Indian, Gulf and Western holiday calendars are built on different systems, so the days each side loses rarely coincide.
Is BST ahead of IST?
No, it is the other way around: IST is ahead of BST by 4 hours and 30 minutes.
Converting the other way
Looking up times starting from IST? Use the IST to BST converter, which leads with IST as the starting point and is written for that reader.
Related converters
- IST to EST · Eastern Time
- IST to CST · Central Time
- IST to PST · Pacific Time
- IST to UTC · Coordinated Universal Time
- IST to GMT · Greenwich Mean Time
- IST to CET · Central European Time
- IST to GST · Gulf Standard Time
- IST to MST · Mountain Time