How do I convert BST to IST?

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

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

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

BST to IST Time Converter

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

London · British Summer Time

19:28:21

Tuesday, May 5, 2026

GMT+1 · UTC+01:00

Mumbai · India Standard Time

23:58:21

Tuesday, May 5, 2026

GMT+5:30 · UTC+05:30

Convert a specific time

From: BST (London)

To: IST (Mumbai)

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Daylight Saving status right now

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

IST (India Standard Time)

Observes DST: No

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 BST and IST meet?

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

Best meeting window: 09:00–12:00 BST (13:30–16:30 IST).

Hour-by-hour BST to IST conversion table

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

British Summer Time (BST)

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

Major cities in this zone

LondonManchesterEdinburghBirmingham

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

Sun today in London and Mumbai

London

Sunrise

05:26

Sunset

20:30

Solar noon

12:58

Daylight

15h 3m

Mumbai

Sunrise

06:09

Sunset

19:03

Solar noon

12:36

Daylight

12h 53m

Related converters

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

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

Frequently asked questions

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

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

Does BST or IST observe daylight saving time?+

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

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

The strongest overlap is 09:00–12:00 BST (13:30–16:30 IST), giving 4 hours when both sides are within standard 9am-5pm working hours.

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

When it is 12:00 Tue in London (BST), it is 16:30 Tue in Mumbai (IST).

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

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