What is BST in IST?
India Standard Time is 4 hours 30 minutes ahead
British Time is on UTC+1:00 and India Standard Time is on UTC+5:30 right now. British Time is on daylight saving, so its clocks read BST. The gap changes during the year — see below.
- Time in London
- 3:14 am
- Time in New Delhi
- 7:44 am
- Difference
- +4:30 h
- Next clock change
- October 25, 2026
Convert a time
IST — India Standard Time
7:30 am
Wed
When the difference changes
British Time and India Standard Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:
- Now – October 25, 2026India Standard Time is 4 hours 30 minutes ahead
- October 25, 2026 – March 28, 2027India Standard Time is 5 hours 30 minutes ahead
- March 28, 2027 – onwardsIndia Standard Time is 4 hours 30 minutes ahead
Periods shorter than a day are not listed: both zones change at 2am in their own local time, so there are a few hours on each transition date when the gap is briefly something else.
Daylight saving
British Time
Clocks go back one hour at 2am local time, becoming GMT.
India Standard Time
India Standard Time stays on IST all year, so its offset from UTC never moves.
BST to IST conversion table
Every hour of Wednesday, September 23, 2026, converted from British Time to India Standard Time. 4 of the 24 hours fall on a different calendar day in New Delhi, which is marked.
- 12:00 am BST
- 4:30 am IST
- 1:00 am BST
- 5:30 am IST
- 2:00 am BST
- 6:30 am IST
- 3:00 am BST
- 7:30 am IST
- 4:00 am BST
- 8:30 am IST
- 5:00 am BST
- 9:30 am IST
- 6:00 am BST
- 10:30 am IST
- 7:00 am BST
- 11:30 am IST
- 8:00 am BST
- 12:30 pm IST
- 9:00 am BST
- 1:30 pm IST
- 10:00 am BST
- 2:30 pm IST
- 11:00 am BST
- 3:30 pm IST
- 12:00 pm BST
- 4:30 pm IST
- 1:00 pm BST
- 5:30 pm IST
- 2:00 pm BST
- 6:30 pm IST
- 3:00 pm BST
- 7:30 pm IST
- 4:00 pm BST
- 8:30 pm IST
- 5:00 pm BST
- 9:30 pm IST
- 6:00 pm BST
- 10:30 pm IST
- 7:00 pm BST
- 11:30 pm IST
- 8:00 pm BST
- 12:30 am IST+1 day
- 9:00 pm BST
- 1:30 am IST+1 day
- 10:00 pm BST
- 2:30 am IST+1 day
- 11:00 pm BST
- 3:30 am IST+1 day
Scheduling between the two
Working hours overlap from 9:00 am to 2:00 pm BST, which is 1:30 pm to 6:30 pm IST. Anything inside that window falls in the normal working day at both ends.
A note on BST: it can also mean Bangladesh Standard Time (UTC+6). This page means British Summer Time.
A note on IST: it can also mean Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1). This page means India Standard Time, which is what almost all searches for IST want.
British Time (BST) is used in the whole United Kingdom. In winter the UK is on GMT; from late March to late October it is on BST, an hour ahead.
India Standard Time (IST) is used in all of India and Sri Lanka, on a single UTC+5:30 offset with no daylight saving