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

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

IST to BST Time Converter

India Standard Time → British Summer Time

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

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

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

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

IST → Bangladesh Standard Time (Dhaka) ↗

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

BST (London)

United Kingdom · -4.5h

04:30

New York

USA · -9.5h

23:30-1 day

Tokyo

Japan · +3.5h

12:30

Dubai

United Arab Emirates · -1.5h

07:30

Sydney

Australia · +4.5h

13:30

IST (Mumbai) ↔ BST (London) — time offset

IST (Mumbai) is 4 hours 30 minutes ahead of BST (London). At noon in IST (Mumbai), your contact in BST (London) sees 07:00.

IST (Mumbai) is in the Asia/Kolkata timezone. BST (London) is in Europe/London. The difference is 4.5 hours 30 minutes.

Mutual working hours

IST (Mumbai) and BST (London) 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

IST (Mumbai)

BST (London)

Overlap (3.5h)

Recommended meeting windows

Both IST (Mumbai) and BST (London) are in standard hours simultaneously for 3.5h per day. 3 recommended slots shown below.

14:00 Mumbai / 09:00 London✓ Both working

15:00 Mumbai / 10:00 London✓ Both working

16:00 Mumbai / 11:00 London✓ Both working

Based on standard 09:00–17:00 working hours in each location's local time.

Public holidays for both locations

IST (Mumbai)

No upcoming public holidays this year.

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

Scheduling between IST (Mumbai) and BST (London)

IST (Mumbai) (India) leads BST (London) (United Kingdom) by 4.5 hours. Despite the gap, a 3.5-hour window of shared business hours each day keeps real-time collaboration practical for both sides.

💡 Scheduling tips for these locations

✅

14:00–15:00 in IST (Mumbai) = 09:00–10:00 in BST (London). Both sides are in standard business hours during this window.

✅

15:00–16:00 in IST (Mumbai) = 10:00–11:00 in BST (London). Both sides are in standard business hours during this window.

✅

16:00–17:00 in IST (Mumbai) = 11:00–12:00 in BST (London). Both sides are in standard business hours during this window.

DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.

Get the Extension — Free →

Use the time slider above to find the exact equivalent time for any moment in IST (Mumbai). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.

IST (Mumbai) ↔ BST (London)

3h of business hours overlap daily (09:00–17:00)

IST (Mumbai)

BST (London)