BST to IST time converter
IST is 4h 30m ahead of BST. BST is London's summer time; in 2026 it runs Mar 29 to Oct 24. From Oct 25 it's GMT, and the gap becomes 5h 30m. 9:00 AM BST is 1:30 PM IST.
How many hours is IST from BST?
During this season, IST is 4h 30m ahead of BST.
BST is London's summer time. Outside Mar 29 to Oct 24, London is on GMT and the gap is 5h 30m. For the whole year, see GMT to IST.
When is BST used?
- 2026: Mar 29 to Oct 24
- 2027: Mar 28 to Oct 30
Computed from your browser's time zone database (IANA Europe/London).
What's the best time for a meeting between BST and IST?
9:00 AM to 1:30 PM BST (1:30 PM to 6:00 PM IST) falls inside 9 AM to 6 PM work hours on both sides.
What time is it in IST for each hour in BST?
Every hour in BST while London is on BST (Mar 29 to Oct 24). Green means work hours (9 AM to 6 PM) on both sides.
| BST | IST | Day |
|---|---|---|
| 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 |
Questions
IST is 4h 30m ahead of BST. That's while London is on BST, Mar 29 to Oct 24, 2026. The rest of the year it's GMT and the gap is 5h 30m.
London uses BST from Mar 29 to Oct 24, 2026, then GMT until Mar 27, 2027. BST starts again on Mar 28, 2027. The clocks on this page always use the right one for the date you pick.
They are the same place, London, at different times of year. BST is one hour ahead of GMT. If someone writes GMT in summer, they almost always mean BST.
9:00 AM BST is 1:30 PM IST.
9:00 AM to 1:30 PM BST (1:30 PM to 6:00 PM IST) falls inside 9 AM to 6 PM work hours on both sides.
Drag on the BST clock above to mark when you're free, then tap Copy link or Copy image. The IST clock shows them in their time, and the link opens in their own time zone with no sign-up.
Related conversions
More with BST or IST: IST to EST, IST to PST, IST to CST, IST to UTC, IST to GMT, IST to EDT, EDT to IST, IST to PDT, PDT to IST, IST to CDT, CDT to IST, CET to IST, IST to CET, AEST to IST, SGT to IST, GMT to EST, GST to IST, IST to MST, IST to AEST, IST to SGT, IST to GST, IST to JST, IST to NZT, EST to GMT, PST to GMT, GMT to PST, WAT to GMT, EAT to GMT
How this page is made: every time here is computed from the IANA time zone database for the date shown, the same data your phone clock uses. Checked October 15, 2026. Spot a wrong time? Tell us.