GMT to BRT Time Converter
BRT is 4 hours behind GMT. The UK and Ireland are currently on BST (UTC+1:00), and BRT is UTC-3:00.
Best Time to Call Between GMT and BRT
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 BRT. That's a 4-hour window.
both at work GMT only BRT only neither — hours along the strip are GMT.
Common Times Converted
GMT on the left, BRT on the right.
GMT to BRT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| GMT | BRT | 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 | BRT only |
| 6:00 PM | 2:00 PM | BRT only |
| 7:00 PM | 3:00 PM | BRT only |
| 8:00 PM | 4:00 PM | BRT only |
| 9:00 PM | 5:00 PM | — |
| 10:00 PM | 6:00 PM | — |
| 11:00 PM | 7:00 PM | — |
What GMT and BRT 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.
BRT — Brasília Time
São Paulo, Rio de Janeiro, Brasília, Salvador. Standing at UTC-3:00 as written, and the region does not change its clocks, so that offset holds all year. Brazil abolished daylight saving in 2019, so this offset no longer shifts in the southern summer.
Brazil ran daylight saving for decades before abolishing it in 2019, on the argument that changed electricity consumption patterns had erased the savings.
What This Means in Practice
This gap is not fixed
GMT changes its clocks and BRT 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 BRT
Frequently Asked Questions
What is the time difference between GMT and BRT?
BRT is 4 hours behind GMT. That is the live figure. Taken strictly as written, the gap between GMT and BRT 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 BRT?
9:00 AM GMT is 5:00 AM BRT.
What are the best hours to schedule a call between GMT and BRT?
Between 1:00 PM and 5:00 PM GMT, which is 9:00 AM to 1:00 PM BRT. Both sides are inside normal business hours through that window.
Does the difference between GMT and BRT change during the year?
Yes. GMT observes daylight saving and BRT 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 BRT always mean Brasília Time?
Brazil abolished daylight saving in 2019, so this offset no longer shifts in the southern summer.