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BST to IST Time Converter

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.

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BST
British Summer Time
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🇮🇳
IST
India Standard Time
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Select a time to convert
Time Difference
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Your Local Time
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UTC Time
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BST to IST Time Conversion Chart

Popular Time Conversions
Complete 24-Hour Conversion

British Summer Time to India Standard Time full day schedule

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12:00 AM
BST
→
4:30 AM
IST
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1:00 AM
BST
→
5:30 AM
IST
🇮🇳
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2:00 AM
BST
→
6:30 AM
IST
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3:00 AM
BST
→
7:30 AM
IST
🇮🇳
🇬🇧
4:00 AM
BST
→
8:30 AM
IST
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5:00 AM
BST
→
9:30 AM
IST
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6:00 AM
BST
→
10:30 AM
IST
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7:00 AM
BST
→
11:30 AM
IST
🇮🇳
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8:00 AM
BST
→
12:30 PM
IST
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9:00 AM
BST
→
1:30 PM
IST
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10:00 AM
BST
→
2:30 PM
IST
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11:00 AM
BST
→
3:30 PM
IST
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12:00 PM
BST
→
4:30 PM
IST
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1:00 PM
BST
→
5:30 PM
IST
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2:00 PM
BST
→
6:30 PM
IST
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3:00 PM
BST
→
7:30 PM
IST
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4:00 PM
BST
→
8:30 PM
IST
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🇬🇧
5:00 PM
BST
→
9:30 PM
IST
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🇬🇧
6:00 PM
BST
→
10:30 PM
IST
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7:00 PM
BST
→
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)
🇮🇳
🇬🇧
10:00 PM
BST
→
2:30 AM
IST
(next day)
🇮🇳
🇬🇧
11:00 PM
BST
→
3:30 AM
IST
(next day)
🇮🇳

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

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.

Convert to Other Timezones

ACDT ACST ACT ACWST ADT AEDT AEST AFT AKDT AKST ALMT AMST AMT ANAST ANAT AQTT ART AST AWDT AWST AZOST AZOT AZST AZT BNT BOT BRST BRT BTT CAST CAT CCT CDT CEST CET CHADT CHAST CHOST CHOT ChST CHST CHUT CIDST CIST CKT CLST CLT COT CST CVT CXT DAVT DDUT EASST EAST EAT ECT EDT EEST EET EGST EGT EST FET FJST FJT FKST FKT FNT GALT GAMT GET GFT GILT GMT GST GYT HDT HKT HOVST HOVT HST ICT IDT IOT IRDT IRKST IRKT IRST IST JST KGT KOST KRAST KRAT KST KUYT LHDT LHST LINT MAGST MAGT MART MAWT MDT MHT MMT MSD MSK MST MUT MVT MYT NCT NDT NFT NOVST NOVT NPT NRT NST NUT NZDT NZST OMSST OMST ORAT PDT PET PETST PETT PGT PHOT PHT PKT PMDT PMST PONT PST PWT PYST PYT QYZT RET ROTT SAKT SAMT SAST SBT SCT SGT SRET SRT SST SYOT TAHT TFT TJT TKT TLT TMT TOST TOT TRT TVT ULAST ULAT UTC UYST UYT UZT VET VLAST VLAT VOST VUT WAKT WARST WAST WAT WEST WET WFT WGST WGT WIB WIT WITA WST YAKST YAKT YAPT YEKST YEKT