British Summer Time (bst) is used in United Kingdom. The IANA timezone identifier is Europe/London.

India Standard Time (ist) is used in India. The IANA timezone identifier is Asia/Kolkata.

BST to IST Time Converter

British Summer Time → India Standard Time

BST = UTC+1IST = UTC+5:30

⚠️ BST is ambiguous — on this page it means British Summer Time. It also refers to:

Bangladesh Standard Time (Dhaka) → IST ↗

⚠️ IST is ambiguous — on this page it means India Standard Time. It also refers to:

BST → Ireland Standard Time (Dublin) ↗BST → Israel Standard Time (Jerusalem) ↗

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

IST (Mumbai)

India · +4.5h

13:30

New York

USA · -5h

04:00

Tokyo

Japan · +8h

17:00

Dubai

United Arab Emirates · +3h

12:00

Sydney

Australia · +9h

18:00

BST (London) to IST (Mumbai) — exact time difference

BST (London) is 5 hours 30 minutes behind IST (Mumbai). At noon in BST (London), your contact in IST (Mumbai) sees 16:00.

BST (London) observes Europe/London and IST (Mumbai) observes Asia/Kolkata — a 4.5 hours 30 minutes gap between them.

Working hours overlap

BST (London) and IST (Mumbai) share 3.5 hours of overlapping business hours daily — enough for real-time collaboration without anyone joining at odd hours.

00:0006:0012:0018:0024:00

BST (London)

IST (Mumbai)

Overlap (3.5h)

Meeting time recommendations

BST (London) and IST (Mumbai) share 3.5 hours of business hours overlap daily. Showing the 3 most balanced slots — see the time table below for the full window.

09:00 London / 13:00 Mumbai✓ Both working

10:00 London / 14:00 Mumbai✓ Both working

11:00 London / 15:00 Mumbai✓ Both working

Assumes a standard 9 AM–5 PM workday in each location's local timezone.

Public holidays for both locations

BST (London)6 holidays

Jul 13Battle of the Boyne

Aug 3Summer Bank Holiday

Aug 31Summer Bank Holiday

Nov 30Saint Andrew's Day

Dec 25Christmas Day

IST (Mumbai)

No upcoming public holidays this year.

Scheduling between BST (London) and IST (Mumbai)

Teams in BST (London) (United Kingdom) and IST (Mumbai) (India) face a 4.5-hour time difference day to day. A 3.5-hour shared business hours window makes real-time meetings feasible for both sides within their normal working day.

💡 Scheduling tips for these locations

✅

Schedule at 09:00–10:00 (BST (London)) for a 13:00–14:00 slot in IST (Mumbai) — the sweet spot where both teams are working.

✅

Schedule at 10:00–11:00 (BST (London)) for a 14:00–15:00 slot in IST (Mumbai) — the sweet spot where both teams are working.

✅

Schedule at 11:00–12:00 (BST (London)) for a 15:00–16:00 slot in IST (Mumbai) — the sweet spot where both teams are working.

Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.

Install ClockinSync Free →

Drag the slider at the top to convert any BST (London) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.

BST (London) ↔ IST (Mumbai)

4h of business hours overlap daily (09:00–17:00)

BST (London)

IST (Mumbai)

00:00

04:30

01:00

05:30

02:00

06:30

03:00

07:30

04:00

08:30

05:00

09:30Working

06:00

10:30Working

07:00

11:30Working

08:00

12:30Working

09:00Working

13:30Working

10:00Working

14:30Working

11:00Working

15:30Working

12:00Working

16:30Working

13:00Working

17:30off

14:00Working

18:30off

15:00Working

19:30off

16:00Working

20:30off

17:00

21:30

18:00

22:30

19:00

23:30

20:00

00:30+1d

21:00

01:30+1d

22:00

02:30+1d

23:00

03:30+1d

Working hours: 09:00–17:00 local. Green = both working. Purple = one side only.

Frequently Asked Questions

What is the difference between bst and ist?

British Summer Time (bst) is UTC+1 and India Standard Time (ist) is UTC+5:30. The difference between them is 4.5 hours.

Where is bst used?

British Summer Time (bst) is used in United Kingdom and surrounding regions. The IANA timezone identifier is Europe/London. Note: bst is ambiguous and may refer to other timezones.

Where is ist used?

India Standard Time (ist) is used in India and surrounding regions. The IANA timezone identifier is Asia/Kolkata. Note: ist is ambiguous and may refer to other timezones.

How do I convert bst to ist?

Use the interactive converter above. Drag the time slider to any bst time and the ist equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.

Popular BST conversions

BST → New York BST → Tokyo BST → Dubai BST → Sydney BST → Paris BST → Berlin BST → Singapore BST → Los Angeles BST → Toronto BST → Mumbai

Popular IST conversions

London → IST New York → IST Tokyo → IST Dubai → IST Sydney → IST Paris → IST Berlin → IST Singapore → IST Los Angeles → IST Toronto → IST