IST to BST Converter
BST is 4 hours 30 minutes behind IST for most of the year. The gap changes for a few weeks a year because the two places switch to daylight saving time on different dates.
BST to IST insteadTime difference between IST and BST
BST is 4 hours 30 minutes behind IST for most of the year.
- 2026: BST is 5 hours 30 minutes behind IST from Jan 1 – Mar 28, 2026, Oct 25 – Dec 31, 2026.
- 2027: BST is 5 hours 30 minutes behind IST from Jan 1 – Mar 27, 2027, Oct 31 – Dec 31, 2027.
IST to BST conversion table
| IST | BSTMost of the year | BSTJan 1 – Mar 28, 2026, Oct 25 – Dec 31, 2026 |
|---|---|---|
| 12 AM | 7:30 PM−1 day | 6:30 PM−1 day |
| 1 AM | 8:30 PM−1 day | 7:30 PM−1 day |
| 2 AM | 9:30 PM−1 day | 8:30 PM−1 day |
| 3 AM | 10:30 PM−1 day | 9:30 PM−1 day |
| 4 AM | 11:30 PM−1 day | 10:30 PM−1 day |
| 5 AM | 12:30 AM | 11:30 PM−1 day |
| 6 AM | 1:30 AM | 12:30 AM |
| 7 AM | 2:30 AM | 1:30 AM |
| 8 AM | 3:30 AM | 2:30 AM |
| 9 AM | 4:30 AM | 3:30 AM |
| 10 AM | 5:30 AM | 4:30 AM |
| 11 AM | 6:30 AM | 5:30 AM |
| 12 PM | 7:30 AM | 6:30 AM |
| 1 PM | 8:30 AM | 7:30 AM |
| 2 PM | 9:30 AM | 8:30 AM |
| 3 PM | 10:30 AM | 9:30 AM |
| 4 PM | 11:30 AM | 10:30 AM |
| 5 PM | 12:30 PM | 11:30 AM |
| 6 PM | 1:30 PM | 12:30 PM |
| 7 PM | 2:30 PM | 1:30 PM |
| 8 PM | 3:30 PM | 2:30 PM |
| 9 PM | 4:30 PM | 3:30 PM |
| 10 PM | 5:30 PM | 4:30 PM |
| 11 PM | 6:30 PM | 5:30 PM |
Best time to meet
Working hours (9 AM – 5 PM) overlap for 3 hours 30 minutes: 1:30 PM – 5 PM IST (9 AM – 12:30 PM BST). That window is the best time for calls and meetings.
Frequently asked questions
What time is it in BST when it's 9 AM in IST?
4:30 AM for most of the year. BST is 4 hours 30 minutes behind IST.
How many hours is BST behind IST?
Usually 4 hours 30 minutes. The gap changes for a few weeks a year because daylight saving time starts and ends on different dates: 2026: BST is 5 hours 30 minutes behind IST from Jan 1 – Mar 28, 2026, Oct 25 – Dec 31, 2026. 2027: BST is 5 hours 30 minutes behind IST from Jan 1 – Mar 27, 2027, Oct 31 – Dec 31, 2027.
Does IST use daylight saving time?
No. India Standard Time stays at UTC+5:30 all year.
Does BST use daylight saving time?
Yes. UK Time is UTC+0 (GMT) in January and UTC+1 (BST) in July. Mar 29, 2026: clocks go forward to UTC+1; Oct 25, 2026: clocks go back to UTC+0.
When is the best time to schedule a meeting between IST and BST?
Working hours (9 AM – 5 PM) overlap for 3 hours 30 minutes: 1:30 PM – 5 PM IST (9 AM – 12:30 PM BST). That window is the best time for calls and meetings.
Which IST does this page use?
IST here means India Standard Time (UTC+5:30), not Irish or Israel Standard Time.