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

IST to LONDON Time Converter

Q: Where is london used?

LONDON (London) (london) is used in United Kingdom. The IANA timezone identifier is Europe/London.

India Standard Time → LONDON (London)

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

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

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

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

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) to London — exact time difference

IST (Mumbai) is 4 hours 30 minutes ahead of London. When IST (Mumbai) clocks hit noon, London reads 07:00.

IST (Mumbai) runs on Asia/Kolkata; London runs on Europe/London. Together they are 4.5 hours 30 minutes apart.

Working hours overlap

Every working day, IST (Mumbai) and London are both in business hours for 3.5 hours simultaneously.

00:0006:0012:0018:0024:00

IST (Mumbai)

London

Overlap (3.5h)

Best times to schedule a meeting

There is a 3.5-hour daily window where both locations are in business hours. The 3 best slots are listed 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

Working hours defined as 09:00–17:00 local time for each location.

Holiday calendar for both locations

IST (Mumbai)

No upcoming public holidays this year.

London6 holidays

Jul 13Battle of the Boyne

Aug 3Summer Bank Holiday

Aug 31Summer Bank Holiday

Nov 30Saint Andrew's Day

Dec 25Christmas Day

Working across IST (Mumbai) and London

The 4.5-hour gap between IST (Mumbai) (India) and London (United Kingdom) requires some planning — but a 3.5-hour daily overlap means both teams can connect in real time without unusual scheduling.

💡 Best practice for cross-timezone meetings

✅

If you are in IST (Mumbai), aim for 14:00–15:00, which corresponds to 09:00–10:00 in London — both teams are within working hours.

✅

If you are in IST (Mumbai), aim for 15:00–16:00, which corresponds to 10:00–11:00 in London — both teams are within working hours.

✅

If you are in IST (Mumbai), aim for 16:00–17:00, which corresponds to 11:00–12:00 in London — both teams are within working hours.

Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.

Add to your browser — Free →

Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am IST (Mumbai)".

IST (Mumbai) ↔ LONDON (London)

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

IST (Mumbai)

LONDON (London)