Convert BST to IST
IST is 4.5 hours ahead of BST. BST is UTC+1 and IST is UTC+5:30.
Right now: BST · IST
Best time to schedule a meeting
Standard 9–5 working hours overlap for 4 hours: 9:00 AM–1:00 PM BST (1:00 PM–5:00 PM IST). Schedule meetings inside that window.
| BST | IST | Suitable? |
|---|---|---|
| 9:00 AM | 1:30 PM | working hours |
| 10:00 AM | 2:30 PM | working hours |
| 11:00 AM | 3:30 PM | working hours |
| 12:00 PM | 4:30 PM | working hours |
| 1:00 PM | 5:30 PM | outside 9–5 |
| 2:00 PM | 6:30 PM | outside 9–5 |
| 3:00 PM | 7:30 PM | outside 9–5 |
| 4:00 PM | 8:30 PM | outside 9–5 |
| 5:00 PM | 9:30 PM | outside 9–5 |
BST to IST conversion table
| BST | IST |
|---|---|
| 12:00 AM | 4:30 AM |
| 1:00 AM | 5:30 AM |
| 2:00 AM | 6:30 AM |
| 3:00 AM | 7:30 AM |
| 4:00 AM | 8:30 AM |
| 5:00 AM | 9:30 AM |
| 6:00 AM | 10:30 AM |
| 7:00 AM | 11:30 AM |
| 8:00 AM | 12:30 PM |
| 9:00 AM | 1:30 PM |
| 10:00 AM | 2:30 PM |
| 11:00 AM | 3:30 PM |
| 12:00 PM | 4:30 PM |
| 1:00 PM | 5:30 PM |
| 2:00 PM | 6:30 PM |
| 3:00 PM | 7:30 PM |
| 4:00 PM | 8:30 PM |
| 5:00 PM | 9:30 PM |
| 6:00 PM | 10:30 PM |
| 7:00 PM | 11:30 PM |
| 8:00 PM | 12:30 AM (next day) |
| 9:00 PM | 1:30 AM (next day) |
| 10:00 PM | 2:30 AM (next day) |
| 11:00 PM | 3:30 AM (next day) |
About BST
British Summer Time (BST) is UTC+1. It is used in the UK from late March to late October.
About IST
India Standard Time (IST) is UTC+5:30. It is used in all of India and Sri Lanka, on a half-hour offset.
A warning about daylight saving
The abbreviations on this page each denote a single fixed offset, so every figure here is exact. What changes is which abbreviation a place uses. New York is on EST in January and EDT in July, so "New York time" moves by an hour twice a year while EST and EDT themselves never move. When you schedule across zones, name the city rather than the abbreviation, or use UTC — that is what calendar software does internally.