TimezoneToolbox

BST to IST converter

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

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BST to IST table

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

BSTIST24-hour
12:00 AM4:30 AM 0:00 → 4:30
1:00 AM5:30 AM 1:00 → 5:30
2:00 AM6:30 AM 2:00 → 6:30
3:00 AM7:30 AM 3:00 → 7:30
4:00 AM8:30 AM 4:00 → 8:30
5:00 AM9:30 AM 5:00 → 9:30
6:00 AM10:30 AM 6:00 → 10:30
7:00 AM11:30 AM 7:00 → 11:30
8:00 AM12:30 PM 8:00 → 12:30
9:00 AM1:30 PM 9:00 → 13:30
10:00 AM2:30 PM 10:00 → 14:30
11:00 AM3:30 PM 11:00 → 15:30
12:00 PM4:30 PM 12:00 → 16:30
1:00 PM5:30 PM 13:00 → 17:30
2:00 PM6:30 PM 14:00 → 18:30
3:00 PM7:30 PM 15:00 → 19:30
4:00 PM8:30 PM 16:00 → 20:30
5:00 PM9:30 PM 17:00 → 21:30
6:00 PM10:30 PM 18:00 → 22:30
7:00 PM11:30 PM 19:00 → 23:30
8:00 PM12:30 AM next day20:00 → 0:30
9:00 PM1:30 AM next day21:00 → 1:30
10:00 PM2:30 AM next day22:00 → 2:30
11:00 PM3:30 AM next day23:00 → 3:30

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

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.

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.

Related converters

Questions

What is the time difference between BST and IST?

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

What is 9 am BST in IST?

9:00 am BST is 1:30 PM IST, on dates when the usual difference applies. Use the converter above for any specific date.

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.

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.