BRT to AST
-1hBRT
BRTSOURCEAST
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
BRT and AST on the World Map
The map below highlights the BRT (Brasilia Time) and AST (Atlantic Standard Time) timezone regions across the globe.
BRT – Brasilia Time
UTC-03:00Brasilia Time (BRT) is the time zone for eastern Brazil, 3 hours behind UTC.
- •Brazil abolished daylight saving time in 2019.
- •São Paulo is the largest city in the Southern Hemisphere.
- •BRT is 2 hours ahead of EST.
- •Brazil spans four different time zones.
- •The B3 stock exchange in São Paulo operates on BRT.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •Puerto Rico uses AST year-round and does not observe DST.
- •AST is 1 hour ahead of EST.
- •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
Time Conversion Guide: BRT to AST
BRT runs on Brasilia Time (BRT) at UTC-03:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts BRT 1 hour behind AST — a difference of -1h at the current offsets.
In practice, when it is 9:00 AM in BRT it is 8:00 AM in AST. Midnight in BRT is 11:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
BRT to AST time conversion table
| BRT (BRT) | AST (AST) | Day |
|---|---|---|
| 12:00 AM | 11:00 PM | previous day |
| 6:00 AM | 5:00 AM | same day |
| 7:00 AM | 6:00 AM | same day |
| 8:00 AM | 7:00 AM | same day |
| 9:00 AM | 8:00 AM | same day |
| 12:00 PM | 11:00 AM | same day |
| 3:00 PM | 2:00 PM | same day |
| 5:00 PM | 4:00 PM | same day |
| 6:00 PM | 5:00 PM | same day |
| 9:00 PM | 8:00 PM | same day |
Why people convert BRT to AST time
- Scheduling a call from BRT to AST: a 10:00 AM start in BRT lands at 9:00 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both BRT and AST are inside the 9-to-5 working day between 10:00 AM and 5:00 PM BRT time (9:00 AM–4:00 PM AST). That is roughly 7 hours of usable overlap.
- Watching a live event or market open: BRT viewers need 8:00 AM in AST to catch a 9:00 AM start there, and 1:00 AM if the event is anchored to BRT.
- Always state the zone abbreviation, not just the hour. "3:00 PM BRT" is unambiguous; "3 PM" across a -1h gap is not.
- Block 10:00 AM–5:00 PM BRT as the recurring meeting window if you work primarily from BRT and need AST colleagues present.
About BRT (Brasilia Time)
Brasilia Time (BRT) is the standard time in the most populous regions of Brazil, including São Paulo, Rio de Janeiro, and the capital Brasília. Brazil abolished daylight saving time in 2019, so BRT is now observed year-round in these regions. Brazil spans four time zones in total.
About AST (Atlantic Standard Time)
Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.
Best time to call between BRT and AST
Both BRT and AST sit inside the 9 AM – 5 PM working day between 10:00 AM–5:00 PM BRT, which is 9:00 AM–4:00 PM AST. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
BRT and AST share 7 hours of working-hours overlap (10:00 AM–5:00 PM BRT), so scheduling a live meeting is straightforward.
BRT is 1 hour behind AST (BRT UTC-03:00 → AST UTC-04:00). The shared working window is 10:00 AM–5:00 PM BRT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
BRT
Does not observe DST
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between BRT and AST?
BRT (BRT, UTC-03:00) is 1 hour behind AST (AST, UTC-04:00). The gap is currently -1h.
How do I convert BRT time to AST time?
Add -1h to BRT local time. For example, 9:00 AM in BRT is 8:00 AM in AST.
What time is it in AST right now?
AST uses AST at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h offset from BRT.
What is the best time to call AST from BRT?
Call between 10:00 AM and 5:00 PM BRT — that maps to 9:00 AM–4:00 PM AST and keeps both parties inside the working day.
Which is behind, BRT or AST?
BRT is 1 hour behind AST. When it is 12:00 PM in BRT it is 11:00 AM in AST.
Does daylight saving time affect the BRT–AST difference?
Neither zone observes daylight saving time, so the -1h offset between BRT and AST is fixed all year.
Which other cities share BRT's time zone?
BRT also covers São Paulo, Rio de Janeiro, Brasília, Belo Horizonte, Salvador, Fortaleza, Recife, Curitiba.
Which countries use BRT, BRT's zone?
BRT is used in Brazil (eastern).
Is there a day difference between BRT and AST?
Not normally. The -1h gap only pushes the date over the previous day.
What is the time difference between BRT and AST?
AST is -1h from BRT.
What timezone is BRT in?
BRT operates on its local timezone.
What timezone is AST in?
AST operates on its local timezone.
Which countries use BRT (Brasilia Time)?
BRT is used in Brazil (eastern).
Does BRT observe daylight saving time?
No, BRT does not observe daylight saving time and remains at UTC-03:00 year-round.
What are some interesting facts about BRT?
Brazil abolished daylight saving time in 2019. São Paulo is the largest city in the Southern Hemisphere.
Which cities are in the AST timezone?
Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
What is the UTC offset for AST?
Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.
What should I know about the AST timezone?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
When is it midnight in BRT, what time is it in AST?
When it is 12:00 AM (midnight) in BRT (BRT), it is -1h later in AST (AST).
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See every conversion from BRT →·See every conversion from AST →