Convert India Standard Time to British Summer Time
| IST | BST |
|---|---|
| 12:00 AM | 8:00 PM (-1) |
| 3:00 AM | 11:00 PM (-1) |
| 6:00 AM | 2:00 AM |
| 9:00 AM | 5:00 AM |
| 12:00 PM | 8:00 AM |
| 3:00 PM | 11:00 AM |
| 6:00 PM | 2:00 PM |
| 9:00 PM | 5:00 PM (+1) |
India Standard Time (IST) is UTC+5:30 and British Summer Time (BST) is UTC+1. The exact difference can vary due to Daylight Saving Time changes.
Use our converter above to find the exact time. Enter 9:00 in the IST field to see the corresponding BST time, accounting for current DST rules.
India Standard Time (IST) is based on the Asia/Kolkata timezone. DST observance depends on local regulations. Our converter automatically accounts for current DST rules.
When it is 9:00 AM IST, it is 4.5:00 AM BST. British Summer Time (BST, UTC+1) is 4.5 hours behind India Standard Time (IST, UTC+5:30). Your working-hours overlap window is 1.5:00 PM–5:00 PM IST (9:00 AM–0.5:00 PM BST).
| IST | BST |
|---|---|
| 12:00 AM | 7.5:00 PM (-1 day) |
| 3:00 AM | 10.5:00 PM (-1 day) |
| 6:00 AM | 1.5:00 AM |
| 9:00 AM | 4.5:00 AM |
| 12:00 PM | 7.5:00 AM |
| 3:00 PM | 10.5:00 AM |
| 6:00 PM | 1.5:00 PM |
| 9:00 PM | 4.5:00 PM |
India Standard Time (IST): Mumbai, Delhi, Bangalore, Chennai, Kolkata, Colombo.
British Summer Time (BST): London, Manchester, Dublin, Edinburgh.
IST is UTC+5:30 and BST is UTC+1, a difference of 4.5 hours. BST is behind IST. This difference can shift by an hour in either direction during Daylight Saving Time transitions — if one zone observes DST and the other doesn't, the offset narrows or widens for part of the year.
Assuming a 9:00 AM – 5:00 PM workday on each side, your working-hours overlap window is 1.5:00 pm–5:00 pm ist (9:00 am–0.5:00 pm bst). To visualize this instantly for any pair of cities, use the visual meeting planner or the timezone overlap finder — both highlight the green overlap window on a live timeline.
India Standard Time (IST) is based on the Asia/Kolkata IANA timezone. DST observance depends on the jurisdiction — for example, most of the continental US switches between standard and daylight time, while India, Japan, and most of Southeast Asia do not observe DST at all. WorldClock.lol uses the authoritative IANA timezone database, so every conversion automatically accounts for the correct DST rules on the date you're converting.
When it is 9:00 AM in India Standard Time (IST, UTC+5:30), it is 4.5:00 AM in British Summer Time (BST). For other times of day, scan the conversion table above or drop into the interactive converter to pick an exact minute. The converter handles both standard and daylight variants correctly.