TimeToZone

IST to BST Converter

GMT is 5 hours 30 minutes behind IST. 9:00 AM IST = 3:30 AM GMT.

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ISTfrom
India Standard Time
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BST
British Summer Time
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GMT is 5 hours 30 minutes behind IST at the moment. To convert IST to BST, subtract 5 hours 30 minutes from the IST time: 9:00 AM IST = 3:30 AM GMT.

IST (India Time) is used in India and Sri Lanka (UTC+5:30, no daylight saving time). BST (British Time) is used in United Kingdom from late March to late October.

IST here means India Standard Time, not Irish or Israel Standard Time. BST here means British Summer Time, not Bangladesh Standard Time. BST (British Summer Time) is not in force right now: United Kingdom from late March to late October is currently on GMT. This page uses whichever name applies on the date you pick, so the numbers below say GMT.

IST to BST time conversion table

IST to BST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.

ISTBSTDay
12:00 AM IST6:30 PM GMTprevious day
1:00 AM IST7:30 PM GMTprevious day
2:00 AM IST8:30 PM GMTprevious day
3:00 AM IST9:30 PM GMTprevious day
4:00 AM IST10:30 PM GMTprevious day
5:00 AM IST11:30 PM GMTprevious day
6:00 AM IST12:30 AM GMTnight
7:00 AM IST1:30 AM GMTnight
8:00 AM IST2:30 AM GMTnight
9:00 AM IST3:30 AM GMTnight
10:00 AM IST4:30 AM GMTnight
11:00 AM IST5:30 AM GMTnight
12:00 PM IST6:30 AM GMT—
1:00 PM IST7:30 AM GMT—
2:00 PM IST8:30 AM GMT—
3:00 PM IST9:30 AM GMTwork hours
4:00 PM IST10:30 AM GMTwork hours
5:00 PM IST11:30 AM GMT—
6:00 PM IST12:30 PM GMT—
7:00 PM IST1:30 PM GMT—
8:00 PM IST2:30 PM GMT—
9:00 PM IST3:30 PM GMT—
10:00 PM IST4:30 PM GMT—
11:00 PM IST5:30 PM GMT—
  • Work rows — 9 AM–5 PM in both places
  • Night in the destination (10 PM–6 AM)

How to convert IST to BST

Subtract 5 hours 30 minutes from the IST time to get BST.

Example: 9:00 AM IST = 3:30 AM GMT.

Across midnight: 1:00 AM IST = 7:30 PM GMT (previous day). The date changes, so always check the day as well as the hour.

Time difference between IST and BST

The time difference between IST and BST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:

  • 1 Jan 2026 – 28 Mar 2026: BST is 5 hours 30 minutes behind of IST.
  • 29 Mar 2026 – 24 Oct 2026: BST is 4 hours 30 minutes behind of IST.
  • 25 Oct 2026 – 31 Dec 2026: BST is 5 hours 30 minutes behind of IST.

IST and BST during daylight saving time

  • IST does not observe daylight saving time; it stays on UTC+5:30 all year.
  • BST next changes on 28 Mar 2027: clocks go forward one hour at 00:59 local time, from GMT (UTC+0) to BST (UTC+1).

Best time for a meeting between IST and BST

IST and BST share 2 hours 30 minutes of the 9 AM–5 PM working day. Any time between 2:30 PM and 5:00 PM IST lands between 9:00 AM and 11:30 AM GMT, inside working hours for both.

Plan a meeting across more time zones.

IST to BST FAQ

What is the time difference between IST and BST?

Right now GMT is 5 hours 30 minutes behind IST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.

What is 9 AM IST in BST?

9:00 AM IST is 3:30 AM GMT.

What is 12 PM (noon) IST in BST?

12:00 PM IST is 6:30 AM GMT.

Is BST ahead of or behind IST?

GMT is 5 hours 30 minutes behind IST, so it is earlier in BST than in IST.

Does IST change for daylight saving time?

No. IST stays on the same offset all year, so conversions never shift for daylight saving time.

Does BST change for daylight saving time?

Yes. BST next changes on 28 Mar 2027, when clocks go forward one hour from GMT to BST.

What is the best time for a meeting between IST and BST?

IST and BST share 2 hours 30 minutes of the 9 AM–5 PM working day. Any time between 2:30 PM and 5:00 PM IST lands between 9:00 AM and 11:30 AM GMT, inside working hours for both.

Related conversions

Convert BST to IST

Convert IST to other time zones

Convert other time zones to BST

Learn more

Updated 7 November 2026. Time zone data: IANA tz database.