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

LONDON to IST Time Converter

Q: Where is london used?

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

LONDON (London) → India Standard Time

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

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

LONDON → Ireland Standard Time (Dublin) ↗LONDON → 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

Time difference: London and IST (Mumbai)

London is 5 hours 30 minutes behind IST (Mumbai). When London clocks hit noon, IST (Mumbai) reads 16:00.

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

Business hours comparison

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

00:0006:0012:0018:0024:00

London

IST (Mumbai)

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.

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

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

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

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

Holiday calendar for both locations

London5 holidays

Aug 3Summer Bank Holiday

Aug 31Summer Bank Holiday

Nov 30Saint Andrew's Day

Dec 25Christmas Day

Dec 28St. Stephen's Day

IST (Mumbai)

No upcoming public holidays this year.

Working across London and IST (Mumbai)

The 4.5-hour gap between London (United Kingdom) and IST (Mumbai) (India) 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 London, aim for 09:00–10:00, which corresponds to 13:00–14:00 in IST (Mumbai) — both teams are within working hours.

✅

If you are in London, aim for 10:00–11:00, which corresponds to 14:00–15:00 in IST (Mumbai) — both teams are within working hours.

✅

If you are in London, aim for 11:00–12:00, which corresponds to 15:00–16:00 in IST (Mumbai) — 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 London".

LONDON (London) ↔ IST (Mumbai)

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

LONDON (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 london and ist?

LONDON (London) (london) is UTC+1 and India Standard Time (ist) is UTC+5:30. The difference between them is 4.5 hours.

Where is london used?

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

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 london to ist?

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

Popular LONDON conversions

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