World Timezones

Colombo to London Converter

Compare London to Colombo instead
Colombo9:13 amMon, Jun 8
ColomboIST
Sri Lanka · UTC+5:30
9:13 amMon, Jun 8
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LondonBST
ENG, United Kingdom · UTC+1
4:43 amMon, Jun 8
7p
8p
9p
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11p
12a
1a
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Offset

The time difference between Colombo and London is 4.5 hours.

4.5 hours

Colombo (IST) is ahead of London (BST).

IST: UTC+5:30

BST: UTC+1

London is currently observing daylight saving time; Colombo is not.

When to schedule

Business-hours overlap: 2 PM–5 PM in Colombo (9 AM–12 PM in London).

Both teams are in working hours during this window on weekdays.

Suggested time: 3:00 PM Colombo (10:30 AM London).

This window may shift by an hour during daylight saving time.

Public holidays in 2026

National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.

United Kingdom

  • Good FridayFri, Apr 3
  • Early May Bank HolidayMon, May 4
  • Spring Bank HolidayMon, May 25
  • Christmas DayFri, Dec 25
  • St. Stephen's DayMon, Dec 28

About these zones

Colombo uses India Standard Time (IST). To call Sri Lanka, dial +94.

London uses Greenwich Mean Time (GMT, or BST). To call United Kingdom, dial +44.

London is approximately 5,400 miles northwest of Colombo.

Quick reference

Full 24-hour conversion table — tap any time to open it in the converter.

ColomboLondonDay
12:00 am7:30 pm-1 day
1:00 am8:30 pm-1 day
2:00 am9:30 pm-1 day
3:00 am10:30 pm-1 day
4:00 am11:30 pm-1 day
5:00 am12:30 amSame day
6:00 am1:30 amSame day
7:00 am2:30 amSame day
8:00 am3:30 amSame day
9:00 am4:30 amSame day
10:00 am5:30 amSame day
11:00 am6:30 amSame day
12:00 pm7:30 amSame day
1:00 pm8:30 amSame day
2:00 pm9:30 amSame day
3:00 pm10:30 amSame day
4:00 pm11:30 amSame day
5:00 pm12:30 pmSame day
6:00 pm1:30 pmSame day
7:00 pm2:30 pmSame day
8:00 pm3:30 pmSame day
9:00 pm4:30 pmSame day
10:00 pm5:30 pmSame day
11:00 pm6:30 pmSame day

Daylight saving time

London observes daylight saving time; Colombo does not. The offset between the two zones changes when London transitions: on Sunday, October 25, 2026, clocks fall back from BST to GMT.

See the daylight saving time page for transition dates across every time zone.

Daylight today

Colombo
Sunrise
5:55 AM
Sunset
6:26 PM
Day length
12h 31m
London
Sunrise
4:46 AM
Sunset
9:15 PM
Day length
16h 30m

Daylight overlap: 9h 10m — 9:16 AM–6:26 PM in Colombo (4:46 AM–1:56 PM in London). Both locations are in daylight during this window.

Cities in these zones

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in India Standard Time

  • CMB
  • RML

Airports in Greenwich Mean Time

  • LCY
  • LGW
  • LHR
  • LTN
  • STN
  • BHX
  • EMA
  • GLA
  • PIK
  • LBA

Related conversions

Common conversions

What is 9:00 am Colombo in London?
9:00 am Colombo is 4:30 am London.
What is 12:00 pm Colombo in London?
12:00 pm Colombo is 7:30 am London.
What is 12:30 pm Colombo in London?
12:30 pm Colombo is 8:00 am London.
What is 2:00 pm Colombo in London?
2:00 pm Colombo is 9:30 am London.
What is 5:00 pm Colombo in London?
5:00 pm Colombo is 12:30 pm London.
What is 11:30 pm Colombo in London?
11:30 pm Colombo is 7:00 pm London.