How do I convert IST to BST?

To convert IST to BST, use our free time converter tool. Enter the time in India Standard Time and instantly see the equivalent time in British Summer Time. The converter automatically accounts for Daylight Saving Time.

What time is it in London when it's noon in Mumbai?

When it's 12:00 PM (noon) in Mumbai (IST), the time in London (BST) depends on the current UTC offset of both zones. Use our converter to get the exact current conversion.

IST to BST Time Converter

Convert India Standard Time (IST) to British Summer Time (BST). Both time zones are shown live below; current offset between them is 4h 30m behind.

Mumbai · India Standard Time

23:58:21

Tuesday, May 5, 2026

GMT+5:30 · UTC+05:30

London · British Summer Time

19:28:21

Tuesday, May 5, 2026

GMT+1 · UTC+01:00

Convert a specific time

From: IST (Mumbai)

To: BST (London)

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Daylight Saving status right now

IST (India Standard Time)

Observes DST: No

BST (British Summer Time)

Observes DST: Yes
In DST right now: Yes
Next fall back: 2026-10-25
Offset shift: UTC+01:00 → UTC+00:00

Heads up: BST observes DST while IST does not. The 4.5-hour difference shown above will shift by one hour when BST starts or ends DST.

When can IST and BST meet?

3 hours of overlap during standard 9am-5pm working hours.

Best meeting window: 14:00–16:00 IST (09:30–11:30 BST).

Hour-by-hour IST to BST conversion table

IST time (Mumbai)	BST time (London)	Status
00:00 Tue	19:30 Mon	Off-hours both sides
01:00 Tue	20:30 Mon	Off-hours both sides
02:00 Tue	21:30 Mon	Off-hours both sides
03:00 Tue	22:30 Mon	Off-hours both sides
04:00 Tue	23:30 Mon	Off-hours both sides
05:00 Tue	00:30 Tue	Off-hours both sides
06:00 Tue	01:30 Tue	Off-hours both sides
07:00 Tue	02:30 Tue	Off-hours both sides
08:00 Tue	03:30 Tue	Off-hours both sides
09:00 Tue	04:30 Tue	IST working
10:00 Tue	05:30 Tue	IST working
11:00 Tue	06:30 Tue	IST working
12:00 Tue	07:30 Tue	IST working
13:00 Tue	08:30 Tue	IST working
14:00 Tue	09:30 Tue	Both at work
15:00 Tue	10:30 Tue	Both at work
16:00 Tue	11:30 Tue	Both at work
17:00 Tue	12:30 Tue	BST working
18:00 Tue	13:30 Tue	BST working
19:00 Tue	14:30 Tue	BST working
20:00 Tue	15:30 Tue	BST working
21:00 Tue	16:30 Tue	BST working
22:00 Tue	17:30 Tue	Off-hours both sides
23:00 Tue	18:30 Tue	Off-hours both sides

Times computed for today in each zone using the IANA time zone database. The conversion accounts for daylight saving time wherever applicable.

About these time zones

India Standard Time (IST)

IANA identifier: Asia/Kolkata
Current UTC offset: UTC+05:30
Current abbreviation: GMT+5:30

Major cities in this zone

MumbaiNew DelhiBangaloreChennaiKolkata

British Summer Time (BST)

IANA identifier: Europe/London
Current UTC offset: UTC+01:00
Current abbreviation: GMT+1

Major cities in this zone

LondonManchesterEdinburghBirmingham

Sun today in Mumbai and London

Mumbai

Sunrise

06:09

Sunset

19:03

Solar noon

12:36

Daylight

12h 53m

London

Sunrise

05:26

Sunset

20:30

Solar noon

12:58

Daylight

15h 3m

Related converters

BST to IST (reverse)IST to EST IST to PST IST to GMT IST to UTC IST to CET EST to BST PST to BST GMT to BST UTC to BST CET to BST

Looking for local time? See time in Mumbai or time in London.

Frequently asked questions

What is the time difference between IST and BST right now?+

BST (British Summer Time) is currently 4h 30m behind IST (India Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.

Does IST or BST observe daylight saving time?+

IST: does not observe daylight saving time. BST: observes daylight saving time.

When is the best time to schedule a meeting between IST and BST?+

The strongest overlap is 14:00–16:00 IST (09:30–11:30 BST), giving 3 hours when both sides are within standard 9am-5pm working hours.

What time is it in London when it is 12:00 noon in Mumbai?+

When it is 12:00 Tue in Mumbai (IST), it is 07:30 Tue in London (BST).

Which IANA time zone identifiers are used for IST and BST?+

IST maps to "Asia/Kolkata" in the IANA database. BST maps to "Europe/London". These identifiers are what most software libraries use to convert times accurately, including DST handling.