TimezoneToolbox

IST to BST converter

BST is usually 4 h 30 min behind IST. It is 5 h 30 min behind IST 1 Jan–29 Mar and 25 Oct–31 Dec 2026, because of daylight saving time.

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IST to BST table

For 12 July 2026, when BST is 4 h 30 min behind IST. Other dates: see the table on the right.

ISTBST24-hour
12:00 AM7:30 PM prev. day0:00 → 19:30
1:00 AM8:30 PM prev. day1:00 → 20:30
2:00 AM9:30 PM prev. day2:00 → 21:30
3:00 AM10:30 PM prev. day3:00 → 22:30
4:00 AM11:30 PM prev. day4:00 → 23:30
5:00 AM12:30 AM 5:00 → 0:30
6:00 AM1:30 AM 6:00 → 1:30
7:00 AM2:30 AM 7:00 → 2:30
8:00 AM3:30 AM 8:00 → 3:30
9:00 AM4:30 AM 9:00 → 4:30
10:00 AM5:30 AM 10:00 → 5:30
11:00 AM6:30 AM 11:00 → 6:30
12:00 PM7:30 AM 12:00 → 7:30
1:00 PM8:30 AM 13:00 → 8:30
2:00 PM9:30 AM 14:00 → 9:30
3:00 PM10:30 AM 15:00 → 10:30
4:00 PM11:30 AM 16:00 → 11:30
5:00 PM12:30 PM 17:00 → 12:30
6:00 PM1:30 PM 18:00 → 13:30
7:00 PM2:30 PM 19:00 → 14:30
8:00 PM3:30 PM 20:00 → 15:30
9:00 PM4:30 PM 21:00 → 16:30
10:00 PM5:30 PM 22:00 → 17:30
11:00 PM6:30 PM 23:00 → 18:30

When the difference changes

Computed from the IANA tz database (release 2026c). Governments can change these rules; the live converter uses your browser’s own copy of the database.

2026: from (UTC)until (UTC)BST vs IST
1 January 202629 March 20265 h 30 min behind
29 March 202625 October 20264 h 30 min behind
25 October 202631 December 20265 h 30 min behind
2027: from (UTC)until (UTC)BST vs IST
1 January 202728 March 20275 h 30 min behind
28 March 202731 October 20274 h 30 min behind
31 October 202731 December 20275 h 30 min behind

IST: India Standard Time · IST time now
IST can also mean Irish Standard Time or Israel Standard Time. This page means India (Asia/Kolkata), which has one zone and no daylight saving time.

BST: British Summer Time · BST time now
BST only exists from late March to late October. The rest of the year the UK is on GMT. This page follows the London clock either way.

Related converters

Questions

What is the time difference between IST and BST?

BST is usually 4 h 30 min behind IST. It is 5 h 30 min behind IST 1 Jan–29 Mar and 25 Oct–31 Dec 2026, because of daylight saving time.

What is 9 am IST in BST?

9:00 am IST is 4:30 AM BST, on dates when the usual difference applies. Use the converter above for any specific date.

Which IST does this page use?

IST can also mean Irish Standard Time or Israel Standard Time. This page means India (Asia/Kolkata), which has one zone and no daylight saving time.

Which BST does this page use?

BST only exists from late March to late October. The rest of the year the UK is on GMT. This page follows the London clock either way.