EST to COT Time Converter
COT is 1 hour behind EST. The US East Coast is currently on EDT (UTC-4:00), and COT is UTC-5:00.
Best Time to Call Between EST and COT
Both zones are inside normal business hours between 10:00 AM and 5:00 PM EST — that's 9:00 AM to 4:00 PM COT. That's a 7-hour window.
both at work EST only COT only neither — hours along the strip are EST.
Common Times Converted
EST on the left, COT on the right.
EST to COT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| EST | COT | Working hours |
|---|---|---|
| 12:00 AM | 11:00 PM prev day | — |
| 1:00 AM | 12:00 AM | — |
| 2:00 AM | 1:00 AM | — |
| 3:00 AM | 2:00 AM | — |
| 4:00 AM | 3:00 AM | — |
| 5:00 AM | 4:00 AM | — |
| 6:00 AM | 5:00 AM | — |
| 7:00 AM | 6:00 AM | — |
| 8:00 AM | 7:00 AM | — |
| 9:00 AM | 8:00 AM | EST only |
| 10:00 AM | 9:00 AM | Both zones |
| 11:00 AM | 10:00 AM | Both zones |
| 12:00 PM | 11:00 AM | Both zones |
| 1:00 PM | 12:00 PM | Both zones |
| 2:00 PM | 1:00 PM | Both zones |
| 3:00 PM | 2:00 PM | Both zones |
| 4:00 PM | 3:00 PM | Both zones |
| 5:00 PM | 4:00 PM | COT only |
| 6:00 PM | 5:00 PM | — |
| 7:00 PM | 6:00 PM | — |
| 8:00 PM | 7:00 PM | — |
| 9:00 PM | 8:00 PM | — |
| 10:00 PM | 9:00 PM | — |
| 11:00 PM | 10:00 PM | — |
What EST and COT Actually Are
EST — Eastern Standard Time
New York, Toronto, Washington DC, Atlanta, Miami, Boston. Standing at UTC-5:00 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, November 1, 2026, to EST. Australia also uses EST for its own Eastern Standard Time (UTC+10), now more often written AEST.
Eastern Standard Time is only actually in force from early November to mid-March. For the other eight months the same region is on EDT, which is why so many EST conversions are quietly wrong.
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
EST 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, November 1, 2026 unless someone resets it.
Close enough to share a working day
At only 1 hour apart, the two working days overlap almost completely. Scheduling is barely constrained by the difference.
Major Cities in Each Zone
Cities on EST
Cities on COT
Frequently Asked Questions
What is the time difference between EST and COT?
COT is 1 hour behind EST. That is the live figure. Taken strictly as written, the gap between EST and COT is — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM EST in COT?
9:00 AM EST is 8:00 AM COT.
What are the best hours to schedule a call between EST and COT?
Between 10:00 AM and 5:00 PM EST, which is 9:00 AM to 4:00 PM COT. Both sides are inside normal business hours through that window.
Does the difference between EST and COT change during the year?
Yes. EST 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, November 1, 2026.
Does EST always mean Eastern Standard Time?
Australia also uses EST for its own Eastern Standard Time (UTC+10), now more often written AEST.