ET to COT Time Converter
COT is 1 hour behind ET. The US East Coast is currently on EDT (UTC-4:00), and COT is UTC-5:00.
Best Time to Call Between ET and COT
Both zones are inside normal business hours between 10:00 AM and 5:00 PM ET — that's 9:00 AM to 4:00 PM COT. That's a 7-hour window.
both at work ET only COT only neither — hours along the strip are ET.
Common Times Converted
ET on the left, COT on the right.
ET to COT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| ET | 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 | ET 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 ET and COT Actually Are
ET — Eastern 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.
Eastern Time covers roughly half the US population and, because of that, is the zone most American business defaults to when nobody specifies one.
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
ET 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 ET
Cities on COT
Frequently Asked Questions
What is the time difference between ET and COT?
COT is 1 hour behind ET. That is the live figure. Taken strictly as written, the gap between ET and COT is — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM ET in COT?
9:00 AM ET is 8:00 AM COT.
What are the best hours to schedule a call between ET and COT?
Between 10:00 AM and 5:00 PM ET, which is 9:00 AM to 4:00 PM COT. Both sides are inside normal business hours through that window.
Does the difference between ET and COT change during the year?
Yes. ET 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.