COT to London
+6hCOT
COTSOURCELondon
BSTGreen rows indicate typical business hours (9 AM - 5 PM)
COT and BST on the World Map
The map below highlights the COT (Colombia Time) and BST (Greenwich Mean Time) timezone regions across the globe.
COT – Colombia Time
UTC-05:00Colombia Time (COT) is the standard time for Colombia, 5 hours behind UTC.
- •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.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •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.
About London
WikipediaLondon, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.
Understanding the +6h Gap: COT vs London
COT runs on Colombia Time (COT) at UTC-05:00. London runs on British Summer Time (BST) at UTC+01:00, also currently on daylight saving time. That puts COT 6 hours ahead of London — a difference of +6h at the current offsets.
In practice, when it is 9:00 AM in COT it is 3:00 PM in London. Midnight in COT is 6:00 AM in London.London observes daylight saving time while COT does not, so the gap narrows or widens by an hour part of the year.
COT to London time conversion table
| COT (COT) | London (BST) | Day |
|---|---|---|
| 12:00 AM | 6:00 AM | same day |
| 6:00 AM | 12:00 PM | same day |
| 7:00 AM | 1:00 PM | same day |
| 8:00 AM | 2:00 PM | same day |
| 9:00 AM | 3:00 PM | same day |
| 12:00 PM | 6:00 PM | same day |
| 3:00 PM | 9:00 PM | same day |
| 5:00 PM | 11:00 PM | same day |
| 6:00 PM | 12:00 AM | next day |
| 9:00 PM | 3:00 AM | next day |
Why people convert COT to London time
- Scheduling a call from COT to London: a 10:00 AM start in COT lands at 4:00 PM in London, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both COT and London are inside the 9-to-5 working day between 9:00 AM and 11:00 AM COT time (3:00 PM–5:00 PM BST). That is roughly 2 hours of usable overlap.
- Watching a live event or market open: COT viewers need 3:00 PM in London to catch a 9:00 AM start there, and 6:00 PM if the event is anchored to COT.
- Always state the zone abbreviation, not just the hour. "3:00 PM COT" is unambiguous; "3 PM" across a +6h gap is not.
- Block 9:00 AM–11:00 AM COT as the recurring meeting window if you work primarily from COT and need London colleagues present.
- London: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
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.
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.
Best time to call between COT and London
Both COT and London sit inside the 9 AM – 5 PM working day between 9:00 AM–11:00 AM COT, which is 3:00 PM–5:00 PM BST. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
COT and London overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.
COT is 6 hours ahead of London (COT UTC-05:00 → BST UTC+01:00). The shared working window is 9:00 AM–11:00 AM COT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
COT
Does not observe DST
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between COT and London?
COT (COT, UTC-05:00) is 6 hours ahead of London (BST, UTC+01:00). The gap is currently +6h.
How do I convert COT time to London time?
Add +6h to COT local time. For example, 9:00 AM in COT is 3:00 PM in London.
What time is it in London right now?
London uses BST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +6h offset from COT.
What is the best time to call London from COT?
Call between 9:00 AM and 11:00 AM COT — that maps to 3:00 PM–5:00 PM BST and keeps both parties inside the working day.
Which is ahead, COT or London?
COT is 6 hours ahead of London. When it is 12:00 PM in COT it is 6:00 PM in London.
Do COT and London use different time zones?
COT uses COT at UTC-05:00, while London (UK) uses BST at UTC+01:00. The IANA identifiers are America/Bogota and Europe/London.
Does daylight saving time affect the COT–London difference?
Yes at the moment: London 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 COT's time zone?
COT also covers Bogotá, Medellín, Cali, Barranquilla, Cartagena.
Which countries use COT, COT's zone?
COT is used in Colombia.
Is there a day difference between COT and London?
Not normally. The +6h gap only pushes the date over for late-evening times.
What is the time difference between COT and London?
London is +6h from COT.
What timezone is COT in?
COT operates on its local timezone.
What timezone is London in?
London, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
Which countries use COT (Colombia Time)?
COT is used in Colombia.
Does COT observe daylight saving time?
No, COT does not observe daylight saving time and remains at UTC-05:00 year-round.
What are some interesting facts about COT?
Colombia does not observe daylight saving time. COT is the same offset as EST (UTC-05:00).
Which cities are in the GMT timezone?
Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.
What is the UTC offset for GMT?
Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.
What should I know about the GMT timezone?
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.
When is it midnight in COT, what time is it in London?
When it is 12:00 AM (midnight) in COT (COT), it is +6h later in London (GMT).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More COT time conversions
- cot to bogota
- cot to colombia
- cot to new york
- cot to dubai
- cot to tokyo
- cot to singapore
- cot to sydney
- cot to los angeles
- cot to paris
- cot to delhi
- cot to mumbai
- cot to berlin
- cot to hong kong
- cot to toronto
- cot to kathmandu
- new york to cot
- london to cot
- dubai to cot
- tokyo to cot
- singapore to cot
- sydney to cot
- los angeles to cot
- paris to cot
- delhi to cot
- mumbai to cot
- berlin to cot
- hong kong to cot
- toronto to cot
- kathmandu to cot
See every conversion from COT →·See every conversion from London →