London to Calcutta time converter

Calcutta is 1 hour ahead of London. When it is 9:00 AM in London, it is 10:00 AM in Calcutta.

London BST

Monday, October 19, 2026

Calcutta SAST

Monday, October 19, 2026

London
United Kingdom
Mon, Oct 19
BSTUTC+1
Calcutta
South Africa
Mon, Oct 19
SASTUTC+2+1h
Finding your time zone…
Shared working hours (9:00–18:00)

London to Calcutta conversion table

Every hour of today in London and the matching time in Calcutta. Light rows are typical working hours (9:00–18:00).

LondonCalcutta
12:00 AM1:00 AM
1:00 AM2:00 AM
2:00 AM3:00 AM
3:00 AM4:00 AM
4:00 AM5:00 AM
5:00 AM6:00 AM
6:00 AM7:00 AM
7:00 AM8:00 AM
8:00 AM9:00 AM
9:00 AM10:00 AM
10:00 AM11:00 AM
11:00 AM12:00 PM
12:00 PM1:00 PM
1:00 PM2:00 PM
2:00 PM3:00 PM
3:00 PM4:00 PM
4:00 PM5:00 PM
5:00 PM6:00 PM
6:00 PM7:00 PM
7:00 PM8:00 PM
8:00 PM9:00 PM
9:00 PM10:00 PM
10:00 PM11:00 PM
11:00 PM12:00 AM+1 day

Best time to call or meet

Both sides are at work from 9:00 AM – 5:00 PM in London (10:00 AM – 6:00 PM in Calcutta).

Daylight saving time and the difference

The difference changes during the year because London and Calcutta switch clocks on different dates:

  • Oct 19, 2026 – Oct 25, 2026: +1h
  • Oct 25, 2026 – Mar 28, 2027: +2h
  • Mar 28, 2027 – Oct 19, 2027: +1h

Distance

London and Calcutta are 9,041 km (5,618 miles) apart in a straight line.

More conversions

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New York to CalcuttaLos Angeles to CalcuttaChicago to CalcuttaToronto to CalcuttaSão Paulo to CalcuttaParis to CalcuttaBerlin to CalcuttaMoscow to CalcuttaDubai to CalcuttaNew Delhi to CalcuttaBangkok to CalcuttaSingapore to Calcutta

Questions and answers

What is the time difference between London and Calcutta?

Calcutta is 1 hour ahead of London.

What time is it in Calcutta when it is 9 AM in London?

When it is 9:00 AM in London, it is 10:00 AM in Calcutta.

When is the best time to call Calcutta from London?

Both sides are at work from 9:00 AM – 5:00 PM in London (10:00 AM – 6:00 PM in Calcutta).

Does the time difference between London and Calcutta change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.