IST to BST Time Converter
Convert India Standard Time to British Summer Time instantly.
Scroll the timeline to check any hour of the day.
Search any city, build a custom world clock, and plan across more time zones and options in the FlutterTime app. Free.
How the IST to BST time difference works
BST is 4 hours 30 minutes behind IST. India Standard Time (IST) is the time zone of India and Sri Lanka.
British Summer Time (BST) is the spring-to-autumn daylight time of the United Kingdom, fixed at one hour ahead of GMT.
For example, 9:00 AM IST is 4:30 AM BST.
Scroll the timeline above to convert any moment, or use the chart below for a quick reference.
Time difference
4 hours 30 minutes
IST to BST conversion chart
| India Standard Time (IST) |
British Summer Time (BST) |
| 12:00 AM |
7:30 PM -1 day |
| 1:00 AM |
8:30 PM -1 day |
| 2:00 AM |
9:30 PM -1 day |
| 3:00 AM |
10:30 PM -1 day |
| 4:00 AM |
11:30 PM -1 day |
| 5:00 AM |
12:30 AM |
| 6:00 AM |
1:30 AM |
| 7:00 AM |
2:30 AM |
| 8:00 AM |
3:30 AM |
| 9:00 AM |
4:30 AM |
| 10:00 AM |
5:30 AM |
| 11:00 AM |
6:30 AM |
| 12:00 PM |
7:30 AM |
| 1:00 PM |
8:30 AM |
| 2:00 PM |
9:30 AM |
| 3:00 PM |
10:30 AM |
| 4:00 PM |
11:30 AM |
| 5:00 PM |
12:30 PM |
| 6:00 PM |
1:30 PM |
| 7:00 PM |
2:30 PM |
| 8:00 PM |
3:30 PM |
| 9:00 PM |
4:30 PM |
| 10:00 PM |
5:30 PM |
| 11:00 PM |
6:30 PM |
Best time to meet
A standard 9 to 5 workday overlaps from 1:30 PM to 5:00 PM IST (9:00 AM to 12:30 PM BST). Schedule inside that window to catch both coasts during business hours.
Cities in each time zone
India Standard Time (IST)
MumbaiDelhiBengaluruKolkataChennaiHyderabad
British Summer Time (BST)
LondonManchesterBirminghamGlasgowLiverpoolEdinburgh
IST to BST questions
Is BST ahead of or behind IST?
BST is 4 hours 30 minutes behind IST. So 9:00 AM IST is 4:30 AM BST, and 5:00 PM IST is 12:30 PM BST.
What time is it in BST when it is 12:00 PM IST?
When it is 12:00 PM (noon) IST in India Standard Time, it is 7:30 AM BST in British Summer Time.
How many hours difference is there between IST and BST?
There is a 4 hours 30 minutes difference. British Summer Time (BST) runs 4 hours 30 minutes behind India Standard Time (IST).
Do IST and BST observe daylight saving time?
Neither India Standard Time nor British Summer Time shifts its clocks for daylight saving time, so the 4 hours 30 minutes difference between them is the same all year. BST is itself the daylight-saving period of the United Kingdom: clocks there run on BST from late March to late October and return to GMT in winter.
What is the best time to schedule a meeting between IST and BST?
A standard 9-to-5 workday overlaps from 1:30 PM to 5:00 PM IST (9:00 AM to 12:30 PM BST). Scheduling inside that window keeps the call during business hours in both India Standard Time and British Summer Time.
Which cities use IST and BST?
India Standard Time (IST) covers cities such as Mumbai, Delhi, Bengaluru, Kolkata, Chennai, Hyderabad. British Summer Time (BST) covers cities such as London, Manchester, Birmingham, Glasgow, Liverpool, Edinburgh.
Related conversions
