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India time to London time

Convert Indian Standard Time (IST) to the time in London (GMT or BST), with the hours that suit a call.

India now
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London now
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Difference now
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Convert an exact time

The time difference

London is 5 hours 30 minutes behind India for part of the year and 4 hours 30 minutes behind for the rest, because London changes its clocks and India does not. India is always UTC+5:30, known as IST.

Which difference applies when

India time to London time when London is UTC

Good hours to start a call (8 am to 9 pm in both places): from 2:00 pm to 8:00 pm India time. Hours that start inside office time (9 am to 6 pm) in both: 3:00 pm to 5:00 pm India time.

India (IST)London
12:00 am6:30 pm previous day
1:00 am7:30 pm previous day
2:00 am8:30 pm previous day
3:00 am9:30 pm previous day
4:00 am10:30 pm previous day
5:00 am11:30 pm previous day
6:00 am12:30 am
7:00 am1:30 am
8:00 am2:30 am
9:00 am3:30 am
10:00 am4:30 am
11:00 am5:30 am
12:00 pm6:30 am
1:00 pm7:30 am
2:00 pm8:30 am
3:00 pm9:30 am
4:00 pm10:30 am
5:00 pm11:30 am
6:00 pm12:30 pm
7:00 pm1:30 pm
8:00 pm2:30 pm
9:00 pm3:30 pm
10:00 pm4:30 pm
11:00 pm5:30 pm

India time to London time when London is UTC+1

Good hours to start a call (8 am to 9 pm in both places): from 1:00 pm to 8:00 pm India time. Hours that start inside office time (9 am to 6 pm) in both: 2:00 pm to 5:00 pm India time.

India (IST)London
12:00 am7:30 pm previous day
1:00 am8:30 pm previous day
2:00 am9:30 pm previous day
3:00 am10:30 pm previous day
4:00 am11:30 pm previous day
5:00 am12:30 am
6:00 am1:30 am
7:00 am2:30 am
8:00 am3:30 am
9:00 am4:30 am
10:00 am5:30 am
11:00 am6:30 am
12:00 pm7:30 am
1:00 pm8:30 am
2:00 pm9:30 am
3:00 pm10:30 am
4:00 pm11:30 am
5:00 pm12:30 pm
6:00 pm1:30 pm
7:00 pm2:30 pm
8:00 pm3:30 pm
9:00 pm4:30 pm
10:00 pm5:30 pm
11:00 pm6:30 pm

Worked examples

While London is UTC. An office that closes at 6:00 pm in India closes when it is 12:30 pm in London. A 9:00 am start in London is 2:30 pm in India, and its 6:00 pm finish is 11:30 pm in India. A message sent at 10:30 pm from India lands at 5:00 pm in London.

While London is UTC+1. An office that closes at 6:00 pm in India closes when it is 1:30 pm in London. A 9:00 am start in London is 1:30 pm in India, and its 6:00 pm finish is 10:30 pm in India. A message sent at 10:30 pm from India lands at 6:00 pm in London.

When the date is different

London is behind India (while London is UTC), so for 5 hours 30 minutes of every day the calendar date differs: from midnight until 5:30 am India time, it is still the previous day in London. Mention the date as well as the time when you fix something in those hours.

London is behind India (while London is UTC+1), so for 4 hours 30 minutes of every day the calendar date differs: from midnight until 4:30 am India time, it is still the previous day in London. Mention the date as well as the time when you fix something in those hours.

Why the gap is what it is

Indian Standard Time follows the sun at longitude 82.5° east. The zone that London belongs to has its largest city, London, at about 0.1° west. The sun crosses the sky between those two lines in about 5 hours 31 minutes. Clock time rounds that to a tidy figure: 5 hours 30 minutes or 4 hours 30 minutes. The two figures differ because every country picks a round offset that suits its whole territory, and some add summer time on top.

Rows marked in colour fall between 8 am and 9 pm in both places. Dates are from the IANA time zone database 2026f.

More

Read about time in London or time in India. Other conversions from India: New York, Chicago, Denver, Los Angeles, Toronto, Paris, Berlin, Moscow, Dubai, Riyadh, Doha, Kuwait, Karachi, Kathmandu, Dhaka, Colombo, Singapore, Kuala Lumpur, Bangkok, Hong Kong, Shanghai, Tokyo, Seoul, Sydney, Melbourne, Perth, Auckland, Johannesburg, Nairobi.