GMT to ART Time Converter
ART is 4 hours behind GMT. The UK and Ireland are currently on BST (UTC+1:00), and ART is UTC-3:00.
Best Time to Call Between GMT and ART
Both zones are inside normal business hours between 1:00 PM and 5:00 PM GMT — that's 9:00 AM to 1:00 PM ART. That's a 4-hour window.
both at work GMT only ART only neither — hours along the strip are GMT.
Common Times Converted
GMT on the left, ART on the right.
GMT to ART: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| GMT | ART | Working hours |
|---|---|---|
| 12:00 AM | 8:00 PM prev day | — |
| 1:00 AM | 9:00 PM prev day | — |
| 2:00 AM | 10:00 PM prev day | — |
| 3:00 AM | 11:00 PM prev day | — |
| 4:00 AM | 12:00 AM | — |
| 5:00 AM | 1:00 AM | — |
| 6:00 AM | 2:00 AM | — |
| 7:00 AM | 3:00 AM | — |
| 8:00 AM | 4:00 AM | — |
| 9:00 AM | 5:00 AM | GMT only |
| 10:00 AM | 6:00 AM | GMT only |
| 11:00 AM | 7:00 AM | GMT only |
| 12:00 PM | 8:00 AM | GMT only |
| 1:00 PM | 9:00 AM | Both zones |
| 2:00 PM | 10:00 AM | Both zones |
| 3:00 PM | 11:00 AM | Both zones |
| 4:00 PM | 12:00 PM | Both zones |
| 5:00 PM | 1:00 PM | ART only |
| 6:00 PM | 2:00 PM | ART only |
| 7:00 PM | 3:00 PM | ART only |
| 8:00 PM | 4:00 PM | ART only |
| 9:00 PM | 5:00 PM | — |
| 10:00 PM | 6:00 PM | — |
| 11:00 PM | 7:00 PM | — |
What GMT and ART Actually Are
GMT — Greenwich Mean Time
The UK and Ireland in winter, plus Iceland, Portugal and much of West Africa. Standing at UTC 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. Often used loosely as a synonym for UTC. They differ by less than a second, so for scheduling they are interchangeable.
Britain ran an experiment from 1968 to 1971 on permanent UTC+1, abandoning GMT entirely. It was scrapped after complaints about dark winter mornings in Scotland.
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
GMT 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, October 25, 2026 unless someone resets it.
Major Cities in Each Zone
Cities on GMT
Cities on ART
Frequently Asked Questions
What is the time difference between GMT and ART?
ART is 4 hours behind GMT. That is the live figure. Taken strictly as written, the gap between GMT and ART is 3 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM GMT in ART?
9:00 AM GMT is 5:00 AM ART.
What are the best hours to schedule a call between GMT and ART?
Between 1:00 PM and 5:00 PM GMT, which is 9:00 AM to 1:00 PM ART. Both sides are inside normal business hours through that window.
Does the difference between GMT and ART change during the year?
Yes. GMT 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, October 25, 2026.
Does GMT always mean Greenwich Mean Time?
Often used loosely as a synonym for UTC. They differ by less than a second, so for scheduling they are interchangeable.
Does ART always mean Argentina Time?
Argentina does not observe daylight saving, so this offset is fixed year-round.