London to Kolkata Time

London is 4 hours 30 minutes behind Kolkata.

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Tap a city name to search and change it (partial names work). Drag the timeline (12 hours in view, scrolls forever). Keyboard: ← → , PgUp / PgDn 1 hour, Home = now.

London time to Kolkata time

London is 4 hours 30 minutes behind Kolkata. When it is 9:00 AM in London, UK, it is 1:30 PM in Kolkata, India. Standard 9 AM to 6 PM working hours overlap for 4 hours 30 minutes: 9:00 AM to 1:30 PM in London (1:30 PM to 6:00 PM in Kolkata).

Time difference

4 hours 30 minutes (London behind). London uses BST; Kolkata uses IST.

Working-hours overlap

4 hours 30 minutes of shared 9 AM to 6 PM hours.

Daylight saving

Next change: Sun, Oct 25, 2026 (London).

London to Kolkata time conversion table

Times for Fri, Oct 9, 2026. Highlighted rows fall within 9 AM to 6 PM in both cities. Drag the live converter above for any other date.
London (BST)Kolkata (IST)
12:00 AM4:30 AM
1:00 AM5:30 AM
2:00 AM6:30 AM
3:00 AM7:30 AM
4:00 AM8:30 AM
5:00 AM9:30 AM
6:00 AM10:30 AM
7:00 AM11:30 AM
8:00 AM12:30 PM
9:00 AM1:30 PM
10:00 AM2:30 PM
11:00 AM3:30 PM
12:00 PM4:30 PM
1:00 PM5:30 PM
2:00 PM6:30 PM
3:00 PM7:30 PM
4:00 PM8:30 PM
5:00 PM9:30 PM
6:00 PM10:30 PM
7:00 PM11:30 PM
8:00 PM12:30 AM (next day)
9:00 PM1:30 AM (next day)
10:00 PM2:30 AM (next day)
11:00 PM3:30 AM (next day)

Daylight saving time

On Sun, Oct 25, 2026, London switches from BST to GMT, so the difference becomes 5 hours 30 minutes (London behind). On Sun, Mar 28, 2027, London switches from GMT to BST, so the difference becomes 4 hours 30 minutes (London behind).

How to use the meeting time converter

  1. Select either city name and search by city, time zone, abbreviation, or UTC offset.
  2. Drag the horizontal timeline, or use the arrow and Page Up/Page Down keys, to choose a moment.
  3. Read the matching time and date for both locations and use the color bands to compare working hours.

Frequently asked questions

What is the time difference between London and Kolkata?

London is 4 hours 30 minutes behind Kolkata. London currently uses BST and Kolkata uses IST.

When it is 9 AM in London, what time is it in Kolkata?

It is 1:30 PM in Kolkata.

What is the best time for a meeting between London and Kolkata?

Standard 9 AM to 6 PM working hours overlap for 4 hours 30 minutes: 9:00 AM to 1:30 PM in London (1:30 PM to 6:00 PM in Kolkata).

Does daylight saving time affect London and Kolkata?

On Sun, Oct 25, 2026, London switches from BST to GMT, so the difference becomes 5 hours 30 minutes (London behind). On Sun, Mar 28, 2027, London switches from GMT to BST, so the difference becomes 4 hours 30 minutes (London behind).

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