BST to IST Time Converter
About this conversion
India Standard Time is 4.5 hours ahead of British Summer Time. BST is also the abbreviation for Bangladesh Standard Time, so state the country when you share a time.
When the time difference changes
Both sides keep a fixed offset, so the gap does not change in the next two years.
Best time to call or meet
09:00 to 13:00 BST is 13:00 to 17:00 IST, 4 hours of shared 09:00 to 17:00 time.
Common times
- 06:00 BST = 10:30 IST
- 09:00 BST = 13:30 IST
- 12:00 BST = 16:30 IST
- 15:00 BST = 19:30 IST
- 17:00 BST = 21:30 IST
- 20:00 BST = 00:30 IST (next day)
BST to IST hour-by-hour table
Highlighted rows fall within 09:00 to 17:00 on both sides.
| BST | IST |
|---|---|
| 00:00 | 04:30 |
| 01:00 | 05:30 |
| 02:00 | 06:30 |
| 03:00 | 07:30 |
| 04:00 | 08:30 |
| 05:00 | 09:30 |
| 06:00 | 10:30 |
| 07:00 | 11:30 |
| 08:00 | 12:30 |
| 09:00 | 13:30 |
| 10:00 | 14:30 |
| 11:00 | 15:30 |
| 12:00 | 16:30 |
| 13:00 | 17:30 |
| 14:00 | 18:30 |
| 15:00 | 19:30 |
| 16:00 | 20:30 |
| 17:00 | 21:30 |
| 18:00 | 22:30 |
| 19:00 | 23:30 |
| 20:00 | 00:30 (next day) |
| 21:00 | 01:30 (next day) |
| 22:00 | 02:30 (next day) |
| 23:00 | 03:30 (next day) |
Related conversions
Clock change guides
- What Is Daylight Saving Time (DST)? A Plain-English GuideWhat daylight saving time is, how it works in the UK, Europe and the US, why it exists, its history, who uses it and the argument over scrapping it.
- Why Do the Clocks Go Back in October? The Real ReasonThe clocks go back in autumn to return the UK to GMT, so winter mornings are lighter. The history, the rule, what time it happens and what changes for you.
- When Do the Clocks Go Forward Again After Going Back?When the UK clocks go forward again after the autumn change, how long the UK stays on GMT, when evenings get lighter and how to remember to reset your clocks.
Frequently asked questions
What is 15:00 BST in IST?
15:00 BST is 19:30 IST at the moment. The answer can change by an hour when either side changes its clocks.
What are the shared working hours for BST and IST?
09:00 to 13:00 BST is 13:00 to 17:00 IST, 4 hours of shared 09:00 to 17:00 time.
When does the BST to IST time difference change?
It does not change in the next two years.