IST to BST Time Converter
Type a time in IST to see it in BST, with daylight saving handled for the date you pick. Every hour of the day is in the table below, and the meeting planner shows when both working days overlap.
In London
3:30 amGMT
9:00 am IST on Wed 14 Jan 2026 is 3:30 am GMT the same day. London is 5 h 30 min behind India.
- Date there
- Wednesday 14 January 2026
- Offsets
- IST UTC+5:30 · GMT UTC+0
- Date used
- Example day: Wednesday 14 January 2026
How this works: Method, 3 sources,
How this works
Method
Here IST means India Standard Time, UTC+5:30 all year; BST means UK time, GMT (UTC+0) in its winter and BST (UTC+1) in its summer, as kept in London. So GMT is 5 h 30 min behind IST, and BST is 4 h 30 min behind. Two 9-to-5 working days overlap by 2 h 30 min in January and 3 h 30 min in July. Full method
Sources
Changes
- 15 more conversion pages (IST to CST, BST to IST, SGT, GST, JST, MST and more); each conversion page shows all 24 hours with working hours shaded, and its best meeting times.
- The pickers find about a thousand more cities, states and countries (Seattle, Bangalore, Texas), and each conversion page names the next clock change on either side.
- The converter opens on the time now, live, with a Now choice beside the time, and the main converter starts from your own time zone.
- First published, with a world clock, pages for the time in 31 places and 15 common conversions such as PST to IST.
How to convert IST to BST
Here IST means India Standard Time, UTC+5:30 all year; BST means UK time, GMT (UTC+0) in its winter and BST (UTC+1) in its summer, as kept in London. So GMT is 5 h 30 min behind IST, and BST is 4 h 30 min behind. Two 9-to-5 working days overlap by 2 h 30 min in January and 3 h 30 min in July.
From India, IST to BST is how to tell when it is office time in London, Manchester or Edinburgh: for outsourcing and IT teams, for students applying to UK universities, and for families calling relatives in Britain. Because India is ahead, the UK morning arrives in the Indian early afternoon, so the overlap runs from about 1:30 pm to 5:00 pm IST in summer and from 2:30 pm in winter.
The UK changes its clocks on the last Sunday in March and the last Sunday in October, India never. So the hour on your Indian calendar for a fixed London meeting moves twice a year: a 10:00 am UK stand-up is at 2:30 pm IST in summer and 3:30 pm IST in winter. This page follows the London clock, so for winter dates it shows GMT. UK deadlines such as visa appointments and university portals usually close on UK time, so convert the actual date.
Rule of thumb: Subtract 4½ hours from Indian time while the UK is on BST and 5½ while it is on GMT: 2:00 pm IST is 9:30 am BST or 8:30 am GMT.
GMT = IST −5:30 · BST = IST −4:30
- UK clocks go forward one hour at 1:00 am on the last Sunday in March and back one hour at 2:00 am on the last Sunday in October. Source: GOV.UK, When do the clocks change?.
Meeting planner: best times for IST and BST
The easiest meetings fall where both working days overlap, shaded dark on the bar for each season. The lighter shading is still between 7 am and 9 pm on both clocks, so one side starts early or stays late.
January: IST and GMT
- Both at work: 2:30 pm to 5:00 pm IST is 9:00 am to 11:30 am GMT (2 h 30 min).
- Early or late for one side: 12:30 pm to 2:30 pm IST is 7:00 am to 9:00 am GMT (2 h); 5:00 pm to 9:00 pm IST is 11:30 am to 3:30 pm GMT (4 h).
July: IST and BST
- Both at work: 1:30 pm to 5:00 pm IST is 9:00 am to 12:30 pm BST (3 h 30 min).
- Early or late for one side: 11:30 am to 1:30 pm IST is 7:00 am to 9:00 am BST (2 h); 5:00 pm to 9:00 pm IST is 12:30 pm to 4:30 pm BST (4 h).
Both between 9 am and 5 pmBoth between 7 am and 9 pm
IST to BST time conversion table
Every hour of the IST day and the time in BST: the January column holds while the clocks are on IST and GMT, the July column while they are on IST and BST. The dates they switch are under the table.
| IST time | GMT in January | BST in July |
|---|---|---|
| 12:00 am | 6:30 pm (day before) | 7:30 pm (day before) |
| 1:00 am | 7:30 pm (day before) | 8:30 pm (day before) |
| 2:00 am | 8:30 pm (day before) | 9:30 pm (day before) |
| 3:00 am | 9:30 pm (day before) | 10:30 pm (day before) |
| 4:00 am | 10:30 pm (day before) | 11:30 pm (day before) |
| 5:00 am | 11:30 pm (day before) | 12:30 am |
| 6:00 am | 12:30 am | 1:30 am |
| 7:00 am | 1:30 am | 2:30 am |
| 8:00 am | 2:30 am | 3:30 am |
| 9:00 am | 3:30 am | 4:30 am |
| 10:00 am | 4:30 am | 5:30 am |
| 11:00 am | 5:30 am | 6:30 am |
| 12:00 pm | 6:30 am | 7:30 am |
| 1:00 pm | 7:30 am | 8:30 am |
| 2:00 pm | 8:30 am | 9:30 am |
| 3:00 pm | 9:30 am | 10:30 am |
| 4:00 pm | 10:30 am | 11:30 am |
| 5:00 pm | 11:30 am | 12:30 pm |
| 6:00 pm | 12:30 pm | 1:30 pm |
| 7:00 pm | 1:30 pm | 2:30 pm |
| 8:00 pm | 2:30 pm | 3:30 pm |
| 9:00 pm | 3:30 pm | 4:30 pm |
| 10:00 pm | 4:30 pm | 5:30 pm |
| 11:00 pm | 5:30 pm | 6:30 pm |
Shaded: 9 am to 5 pm on that clock. Where a row is shaded on both sides, both are at work.
When the IST–BST difference changes next
| Date | What happens | Then |
|---|---|---|
| Sun 25 Oct 2026 | London falls back (GMT) | GMT is 5 h 30 min behind IST |
| Sun 28 Mar 2027 | London springs forward (BST) | BST is 4 h 30 min behind IST |
Frequently Asked Questions
What is 9 am IST in BST?
In January, 9:00 am IST is 3:30 am GMT. In July, 9:00 am IST is 4:30 am BST.
What time is 6 pm IST in the UK?
6:00 pm in India is 1:30 pm in the UK during British Summer Time and 12:30 pm in winter, on the same day.
Why did my London meeting move by an hour?
Because the UK changed its clocks and India did not. After the last Sunday in October a meeting fixed in UK time lands an hour later in India; after the last Sunday in March, an hour earlier.