Convert BST to IST Time - London to Mumbai

Convert British Summer Time (BST) to India Standard Time (IST, UTC+5.5) with our professional time zone converter. Designed for international business meetings between London to Mumbai, this tool provides real-time conversion, optimal meeting time suggestions, business hours comparison, and 24-hour conversion tables. Features include live clock displays, meeting scheduler, time zone maps, and daylight saving time handling.

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BST

British Summer Time

Current Time

Select Date & Time

→

🇮🇳

IST

India Standard Time

Current Time

Converted Time

Select a time to convert

Time Difference

Your Local Time

UTC Time

BST to IST Time Conversion

India Standard Time is 4 hours and 30 minutes ahead of British Summer Time

Always accurate • Live conversion

difference

BST to IST Time Conversion Chart

Popular Time Conversions

Complete 24-Hour Conversion

British Summer Time to India Standard Time full day schedule

🇬🇧 British Summer Time	🇮🇳 India Standard Time
12:00 AM 00:00	4:30 AM 04:30
1:00 AM 01:00	5:30 AM 05:30
2:00 AM 02:00	6:30 AM 06:30
3:00 AM 03:00	7:30 AM 07:30
4:00 AM 04:00	8:30 AM 08:30
5:00 AM 05:00	9:30 AM 09:30
6:00 AM 06:00	10:30 AM 10:30
7:00 AM 07:00	11:30 AM 11:30
8:00 AM 08:00	12:30 PM 12:30
9:00 AM 09:00	1:30 PM 13:30
10:00 AM 10:00	2:30 PM 14:30
11:00 AM 11:00	3:30 PM 15:30
12:00 PM 12:00	4:30 PM 16:30
1:00 PM 13:00	5:30 PM 17:30
2:00 PM 14:00	6:30 PM 18:30
3:00 PM 15:00	7:30 PM 19:30
4:00 PM 16:00	8:30 PM 20:30
5:00 PM 17:00	9:30 PM 21:30
6:00 PM 18:00	10:30 PM 22:30
7:00 PM 19:00	11:30 PM 23:30
8:00 PM 20:00	12:30 AM (next day) 00:30
9:00 PM 21:00	1:30 AM (next day) 01:30
10:00 PM 22:00	2:30 AM (next day) 02:30
11:00 PM 23:00	3:30 AM (next day) 03:30

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12:00 AM

BST

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4:30 AM

IST

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1:00 AM

BST

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5:30 AM

IST

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2:00 AM

BST

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6:30 AM

IST

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3:00 AM

BST

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7:30 AM

IST

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4:00 AM

BST

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8:30 AM

IST

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5:00 AM

BST

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9:30 AM

IST

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6:00 AM

BST

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10:30 AM

IST

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7:00 AM

BST

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11:30 AM

IST

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8:00 AM

BST

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12:30 PM

IST

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9:00 AM

BST

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1:30 PM

IST

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10:00 AM

BST

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2:30 PM

IST

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11:00 AM

BST

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3:30 PM

IST

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12:00 PM

BST

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4:30 PM

IST

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1:00 PM

BST

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5:30 PM

IST

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2:00 PM

BST

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6:30 PM

IST

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3:00 PM

BST

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7:30 PM

IST

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4:00 PM

BST

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8:30 PM

IST

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5:00 PM

BST

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9:30 PM

IST

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6:00 PM

BST

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10:30 PM

IST

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7:00 PM

BST

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11:30 PM

IST

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8:00 PM

BST

→

12:30 AM

IST

(next day)

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9:00 PM

BST

→

1:30 AM

IST

(next day)

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10:00 PM

BST

→

2:30 AM

IST

(next day)

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11:00 PM

BST

→

3:30 AM

IST

(next day)

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Best Meeting Times for BST and IST

Optimal Collaboration Hours

Best times for BST ↔ IST meetings and calls

✅ Business hours overlap available

Recommended Meeting Windows

9:00 AM BST → 1:30 PM IST

Perfect for both time zones

10:00 AM BST → 2:30 PM IST

Perfect for both time zones

11:00 AM BST → 3:30 PM IST

Perfect for both time zones

Based on standard business hours (9:00 AM - 6:00 PM) in each time zone

BST vs IST Time Zone Details

Technical Information & Comparison

Detailed timezone specifications and regional data

🇬🇧

British Summer Time

Source timezone

UTC Offset 1.0h

Code BST

Region United Kingdom

Status ✓ Active

🇮🇳

India Standard Time

Target timezone

UTC Offset 5.5h

Code IST

Region India

Status ✓ Active

Frequently Asked Questions

How many hours ahead is IST from BST?

India Standard Time (IST) is 4 hours and 30 minutes ahead of British Summer Time (BST), or 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT). When it's 12:00 PM BST in London, it's 4:30 PM IST in Mumbai.

What time is it in India when it's 9 AM in London?

When it's 9:00 AM BST in London, it's 1:30 PM IST in India. Popular conversions include 8 AM London = 12:30 PM India, 12 PM London = 4:30 PM India, and 6 PM London = 10:30 PM India. This 4.5-hour difference makes the afternoon in London evening in India.

What time is it in London when it's 9 AM in Mumbai?

When it's 9:00 AM IST in Mumbai, it's 4:30 AM BST in London. Key conversions include 12 PM Mumbai = 7:30 AM London, 3 PM Mumbai = 10:30 AM London, and 6 PM Mumbai = 1:30 PM London. Subtract 4.5 hours from India time to get London time.

Which cities use BST and IST time zones?

BST (British Summer Time) covers UK cities like London, Manchester, Birmingham, Glasgow, and Edinburgh. IST (India Standard Time) includes all Indian cities such as Mumbai, Delhi, Bangalore, Chennai, and Kolkata. The entire UK switches between GMT and BST seasonally, while all of India uses IST year-round.

When does BST start and end in 2025?

BST begins on March 30, 2025, at 1:00 AM and ends on October 26, 2025, at 2:00 AM. During BST (March-October), India is 4.5 hours ahead of the UK. During GMT (October-March), India is 5.5 hours ahead. India never changes its time zone and stays at UTC+5:30 throughout the year.

What's the best time for business meetings between UK and India?

The optimal meeting window is 9:00 AM to 1:30 PM BST, corresponding to 1:30 PM to 6:00 PM IST. This allows excellent overlap between UK business hours (9 AM-5 PM) and Indian business hours (9 AM-6 PM). Avoid scheduling before 9 AM BST or after 1:30 PM BST for comfortable timing on both sides.

How does UK daylight saving time affect BST to IST conversion?

The UK switches between GMT (winter) and BST (summer), changing the time difference with India. During the BST period (March-October), India is 4.5 hours ahead. During the GMT period (October-March), India is 5.5 hours ahead. India never observes daylight saving time, so IST remains constant at UTC+5:30 throughout the year.

What's the easiest way to convert BST to IST quickly?

The fastest method is to add 4.5 hours to UK time during summer (BST) or 5.5 hours during winter (GMT). For smartphone users, add "Mumbai" to your world clock widget or simply ask Siri/Google Assistant, "What time is it in India?" For instant web conversion, Google iformat.io and click on bst to ist.