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DateAlmanac

What is IST in BST?

British Time is 5 hours 30 minutes behind

India Standard Time is on UTC+5:30 and British Time is on UTC+0:00 right now. The gap changes during the year — see below.

Convert a time

GMT — British Time

7:30 am

GMT, Sat

Time in New Delhi
1:59:10 PM
Time in London
8:29:10 AM
Difference
−5:30 h
Next clock change
March 28, 2027

When the difference changes

India Standard Time and British 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:

  1. Now – March 28, 2027British Time is 5 hours 30 minutes behind
  2. March 28, 2027 – October 31, 2027British Time is 4 hours 30 minutes behind
  3. October 31, 2027 – onwardsBritish Time is 5 hours 30 minutes behind

Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.

Daylight saving

India Standard Time

No clock changes

India Standard Time stays on IST all year, so its offset from UTC never moves.

British Time

Sunday, March 28, 2027

Clocks go forward one hour — 1:00 am becomes 2:00 am local time, and the zone is on BST after that.

IST to BST conversion table

Every hour of Saturday, November 7, 2026, converted from India Standard Time to British Time. 6 of the 24 hours fall on a different calendar day in London, which is marked.

12:00 am IST
6:30 pm GMT−1 day
1:00 am IST
7:30 pm GMT−1 day
2:00 am IST
8:30 pm GMT−1 day
3:00 am IST
9:30 pm GMT−1 day
4:00 am IST
10:30 pm GMT−1 day
5:00 am IST
11:30 pm GMT−1 day
6:00 am IST
12:30 am GMT
7:00 am IST
1:30 am GMT
8:00 am IST
2:30 am GMT
9:00 am IST
3:30 am GMT
10:00 am IST
4:30 am GMT
11:00 am IST
5:30 am GMT
12:00 pm IST
6:30 am GMT
1:00 pm IST
7:30 am GMT
2:00 pm IST
8:30 am GMT
3:00 pm IST
9:30 am GMT
4:00 pm IST
10:30 am GMT
5:00 pm IST
11:30 am GMT
6:00 pm IST
12:30 pm GMT
7:00 pm IST
1:30 pm GMT
8:00 pm IST
2:30 pm GMT
9:00 pm IST
3:30 pm GMT
10:00 pm IST
4:30 pm GMT
11:00 pm IST
5:30 pm GMT

Scheduling between the two

Working hours overlap from 3:00 pm to 6:00 pm IST, which is 9:30 am to 12:30 pm GMT. Anything inside that window falls in the normal working day at both ends.

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.

A note on BST: it can also mean Bangladesh Standard Time (UTC+6). This page means British Summer Time.

India Standard Time (IST) is used in all of India and Sri Lanka, on a single UTC+5:30 offset with no daylight saving

British Time (GMT) 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.

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