Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

United Kingdom to COT

-6h

United Kingdom

BSTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

COT

UTC-05:00

HH06

MM00

06:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

United Kingdom

COT

12:00 AM

6:00 PM-1

2:00 AM

8:00 PM-1

4:00 AM

10:00 PM-1

6:00 AM

12:00 AM

8:00 AM

2:00 AM

10:00 AM

4:00 AM

12:00 PM

6:00 AM

2:00 PM

8:00 AM

4:00 PM

10:00 AM

6:00 PM

12:00 PM

8:00 PM

2:00 PM

10:00 PM

4:00 PM

Green rows indicate typical business hours (9 AM - 5 PM)

BST and COT on the World Map

The map below highlights the BST (Greenwich Mean Time) and COT (Colombia Time) timezone regions across the globe.

BST Zone

→

COT Zone

Explore all world timezones interactively →

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key Facts about GMT

•GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
•The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
•GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
•Iceland uses GMT year-round and never observes daylight saving time.
•The UK switches from GMT to BST (British Summer Time) in late March each year.

Daylight Saving:Yes – switches to BST

Learn more about GMT on Wikipedia

COT – Colombia Time

UTC-05:00

Colombia Time (COT) is the standard time for Colombia, 5 hours behind UTC.

Countries in COT

Colombia

Major Cities in COT

BogotáMedellínCaliBarranquillaCartagena

Key Facts about COT

•Colombia does not observe daylight saving time.
•COT is the same offset as EST (UTC-05:00).
•Bogotá sits at 2,640m elevation, making it one of the highest capital cities.

Daylight Saving:No – UTC-05:00 year-round

Learn more about COT on Wikipedia

Understanding the -6h Gap: United Kingdom vs COT

United Kingdom runs on British Summer Time (BST) at UTC+01:00, currently observing daylight saving time. COT runs on Colombia Time (COT) at UTC-05:00. That puts United Kingdom 6 hours behind COT — a difference of -6h at the current offsets.

In practice, when it is 9:00 AM in United Kingdom it is 3:00 AM in COT. Midnight in United Kingdom is 6:00 PM in COT.United Kingdom observes daylight saving time while COT does not, so the gap narrows or widens by an hour part of the year.

United Kingdom to COT time conversion table

United Kingdom (BST)	COT (COT)	Day
12:00 AM	6:00 PM	previous day
6:00 AM	12:00 AM	same day
7:00 AM	1:00 AM	same day
8:00 AM	2:00 AM	same day
9:00 AM	3:00 AM	same day
12:00 PM	6:00 AM	same day
3:00 PM	9:00 AM	same day
5:00 PM	11:00 AM	same day
6:00 PM	12:00 PM	same day
9:00 PM	3:00 PM	same day

Why people convert United Kingdom to COT time

Scheduling a call from United Kingdom to COT: a 10:00 AM start in United Kingdom lands at 4:00 AM in COT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both United Kingdom and COT are inside the 9-to-5 working day between 3:00 PM and 5:00 PM BST time (9:00 AM–11:00 AM COT). That is roughly 2 hours of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in United Kingdom is 2:00 PM in COT makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM BST" is unambiguous; "3 PM" across a -6h gap is not.
Block 3:00 PM–5:00 PM BST as the recurring meeting window if you work primarily from United Kingdom and need COT colleagues present.
United Kingdom: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the -6h gap.

About GMT (Greenwich Mean Time)

Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.

About COT (Colombia Time)

Colombia Time (COT) is used throughout Colombia. Colombia does not observe daylight saving time. COT shares the same offset as EST (UTC-05:00). Bogotá, the capital, is one of the largest cities in South America.

Best time to call between United Kingdom and COT

Both United Kingdom and COT sit inside the 9 AM – 5 PM working day between 3:00 PM–5:00 PM BST, which is 9:00 AM–11:00 AM COT. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

United Kingdom and COT overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.

United Kingdom is 6 hours behind COT (BST UTC+01:00 → COT UTC-05:00). The shared working window is 3:00 PM–5:00 PM BST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

United Kingdom

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

COT

Does not observe DST

Learn More About Time

Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between United Kingdom and COT?

United Kingdom (BST, UTC+01:00) is 6 hours behind COT (COT, UTC-05:00). The gap is currently -6h.

How do I convert United Kingdom time to COT time?

Add -6h to United Kingdom local time. For example, 9:00 AM in United Kingdom is 3:00 AM in COT.

What time is it in COT right now?

COT uses COT at UTC-05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h offset from United Kingdom.

What is the best time to call COT from United Kingdom?

Call between 3:00 PM and 5:00 PM BST — that maps to 9:00 AM–11:00 AM COT and keeps both parties inside the working day.

Which is behind, United Kingdom or COT?

United Kingdom is 6 hours behind COT. When it is 12:00 PM in United Kingdom it is 6:00 AM in COT.

Do United Kingdom and COT use different time zones?

United Kingdom (United Kingdom) uses BST at UTC+01:00, while COT uses COT at UTC-05:00. The IANA identifiers are Europe/London and America/Bogota.

Does daylight saving time affect the United Kingdom–COT difference?

Yes at the moment: United Kingdom is on daylight saving time and COT is not, so the -6h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share United Kingdom's time zone?

BST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.

Which countries use BST, United Kingdom's zone?

BST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.

Is there a day difference between United Kingdom and COT?

Not normally. The -6h gap only pushes the date over the previous day.

What is the time difference between United Kingdom and COT?

COT is -6h from United Kingdom.

What timezone is United Kingdom in?

United Kingdom operates on its local timezone.

What timezone is COT in?

COT operates on its local timezone.

Which countries use GMT (Greenwich Mean Time)?

GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.

Does GMT observe daylight saving time?

Yes, GMT switches to BST during summer months.

What are some interesting facts about GMT?

GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.