ET to ART Time Converter
ART is 1 hour ahead of ET. The US East Coast is currently on EDT (UTC-4:00), and ART is UTC-3:00.
Best Time to Call Between ET and ART
Both zones are inside normal business hours between 9:00 AM and 4:00 PM ET — that's 10:00 AM to 5:00 PM ART. That's a 7-hour window.
both at work ET only ART only neither — hours along the strip are ET.
Common Times Converted
ET on the left, ART on the right.
ET to ART: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| ET | ART | Working hours |
|---|---|---|
| 12:00 AM | 1:00 AM | — |
| 1:00 AM | 2:00 AM | — |
| 2:00 AM | 3:00 AM | — |
| 3:00 AM | 4:00 AM | — |
| 4:00 AM | 5:00 AM | — |
| 5:00 AM | 6:00 AM | — |
| 6:00 AM | 7:00 AM | — |
| 7:00 AM | 8:00 AM | — |
| 8:00 AM | 9:00 AM | ART only |
| 9:00 AM | 10:00 AM | Both zones |
| 10:00 AM | 11:00 AM | Both zones |
| 11:00 AM | 12:00 PM | Both zones |
| 12:00 PM | 1:00 PM | Both zones |
| 1:00 PM | 2:00 PM | Both zones |
| 2:00 PM | 3:00 PM | Both zones |
| 3:00 PM | 4:00 PM | Both zones |
| 4:00 PM | 5:00 PM | ET only |
| 5:00 PM | 6:00 PM | — |
| 6:00 PM | 7:00 PM | — |
| 7:00 PM | 8:00 PM | — |
| 8:00 PM | 9:00 PM | — |
| 9:00 PM | 10:00 PM | — |
| 10:00 PM | 11:00 PM | — |
| 11:00 PM | 12:00 AM next day | — |
What ET and ART 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.
ART — Argentina Time
Buenos Aires, Córdoba, Rosario. Standing at UTC-3:00 as written, and the region does not change its clocks, so that offset holds all year. Argentina does not observe daylight saving, so this offset is fixed year-round.
Argentina has changed its time zone rules more than a dozen times since 1930 and abandoned daylight saving in 2009.
What This Means in Practice
This gap is not fixed
ET changes its clocks and ART 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 ART
Frequently Asked Questions
What is the time difference between ET and ART?
ART is 1 hour ahead of ET. That is the live figure. Taken strictly as written, the gap between ET and ART is 2 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM ET in ART?
9:00 AM ET is 10:00 AM ART.
What are the best hours to schedule a call between ET and ART?
Between 9:00 AM and 4:00 PM ET, which is 10:00 AM to 5:00 PM ART. Both sides are inside normal business hours through that window.
Does the difference between ET and ART change during the year?
Yes. ET observes daylight saving and ART 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 ART always mean Argentina Time?
Argentina does not observe daylight saving, so this offset is fixed year-round.