BST to COT Time Converter
COT is 6 hours behind BST. BST is UTC+1:00, and COT is UTC-5:00.
Best Time to Call Between BST and COT
Both zones are inside normal business hours between 3:00 PM and 5:00 PM BST — that's 9:00 AM to 11:00 AM COT. That's a 2-hour window.
both at work BST only COT only neither — hours along the strip are BST.
Common Times Converted
BST on the left, COT on the right.
BST to COT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| BST | COT | Working hours |
|---|---|---|
| 12:00 AM | 6:00 PM prev day | — |
| 1:00 AM | 7:00 PM prev day | — |
| 2:00 AM | 8:00 PM prev day | — |
| 3:00 AM | 9:00 PM prev day | — |
| 4:00 AM | 10:00 PM prev day | — |
| 5:00 AM | 11:00 PM prev day | — |
| 6:00 AM | 12:00 AM | — |
| 7:00 AM | 1:00 AM | — |
| 8:00 AM | 2:00 AM | — |
| 9:00 AM | 3:00 AM | BST only |
| 10:00 AM | 4:00 AM | BST only |
| 11:00 AM | 5:00 AM | BST only |
| 12:00 PM | 6:00 AM | BST only |
| 1:00 PM | 7:00 AM | BST only |
| 2:00 PM | 8:00 AM | BST only |
| 3:00 PM | 9:00 AM | Both zones |
| 4:00 PM | 10:00 AM | Both zones |
| 5:00 PM | 11:00 AM | COT only |
| 6:00 PM | 12:00 PM | COT only |
| 7:00 PM | 1:00 PM | COT only |
| 8:00 PM | 2:00 PM | COT only |
| 9:00 PM | 3:00 PM | COT only |
| 10:00 PM | 4:00 PM | COT only |
| 11:00 PM | 5:00 PM | — |
What BST and COT Actually Are
BST — British Summer Time
London, Manchester, Birmingham, Glasgow, and the rest of the UK from late March to late October. Standing at UTC+1:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, October 25, 2026, to GMT. BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.
British Summer Time began in 1916 as a wartime fuel-saving measure and has run every year since, making it one of the oldest continuous daylight saving schemes in the world.
COT — Colombia Time
Bogotá, Medellín, Cali, Barranquilla. Standing at UTC-5:00 as written, and the region does not change its clocks, so that offset holds all year.
Colombia briefly tried daylight saving during the energy crisis of 1992-93 and has not repeated it.
What This Means in Practice
This gap is not fixed
BST changes its clocks and COT does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, October 25, 2026 unless someone resets it.
Major Cities in Each Zone
Cities on BST
Cities on COT
Frequently Asked Questions
What is the time difference between BST and COT?
COT is 6 hours behind BST.
What is 9:00 AM BST in COT?
9:00 AM BST is 3:00 AM COT.
What are the best hours to schedule a call between BST and COT?
Between 3:00 PM and 5:00 PM BST, which is 9:00 AM to 11:00 AM COT. Both sides are inside normal business hours through that window.
Does the difference between BST and COT change during the year?
Yes. BST observes daylight saving and COT does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, October 25, 2026.
Does BST always mean British Summer Time?
BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.