AST to BRT
+1hAST
ASTSOURCEBRT
BRTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and BRT on the World Map
The map below highlights the AST (Atlantic Standard Time) and BRT (Brasilia Time) timezone regions across the globe.
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.
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 vs BRT: Offsets, DST and Best Call Times
AST runs on Atlantic Standard Time (AST) at UTC-04:00. BRT runs on Brasilia Time (BRT) at UTC-03:00. That puts AST 1 hour ahead of BRT — a difference of +1h at the current offsets.
In practice, when it is 9:00 AM in AST it is 10:00 AM in BRT. Midnight in AST is 1:00 AM in BRT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to BRT time conversion table
| AST (AST) | BRT (BRT) | Day |
|---|---|---|
| 12:00 AM | 1:00 AM | same day |
| 6:00 AM | 7:00 AM | same day |
| 7:00 AM | 8:00 AM | same day |
| 8:00 AM | 9:00 AM | same day |
| 9:00 AM | 10:00 AM | same day |
| 12:00 PM | 1:00 PM | same day |
| 3:00 PM | 4:00 PM | same day |
| 5:00 PM | 6:00 PM | same day |
| 6:00 PM | 7:00 PM | same day |
| 9:00 PM | 10:00 PM | same day |
Why people convert AST to BRT time
- Scheduling a call from AST to BRT: a 10:00 AM start in AST lands at 11:00 AM in BRT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and BRT are inside the 9-to-5 working day between 9:00 AM and 4:00 PM AST time (10:00 AM–5:00 PM BRT). That is roughly 7 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in AST is 9:00 PM in BRT makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +1h gap is not.
- Block 9:00 AM–4:00 PM AST as the recurring meeting window if you work primarily from AST and need BRT colleagues present.
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.
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.
Best time to call between AST and BRT
Both AST and BRT sit inside the 9 AM – 5 PM working day between 9:00 AM–4:00 PM AST, which is 10:00 AM–5:00 PM BRT. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and BRT share 7 hours of working-hours overlap (9:00 AM–4:00 PM AST), so scheduling a live meeting is straightforward.
AST is 1 hour ahead of BRT (AST UTC-04:00 → BRT UTC-03:00). The shared working window is 9:00 AM–4:00 PM AST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
BRT
Does not observe DST
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 AST and BRT?
AST (AST, UTC-04:00) is 1 hour ahead of BRT (BRT, UTC-03:00). The gap is currently +1h.
How do I convert AST time to BRT time?
Add +1h to AST local time. For example, 9:00 AM in AST is 10:00 AM in BRT.
What time is it in BRT right now?
BRT uses BRT at UTC-03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +1h offset from AST.
What is the best time to call BRT from AST?
Call between 9:00 AM and 4:00 PM AST — that maps to 10:00 AM–5:00 PM BRT and keeps both parties inside the working day.
Which is ahead, AST or BRT?
AST is 1 hour ahead of BRT. When it is 12:00 PM in AST it is 1:00 PM in BRT.
Does daylight saving time affect the AST–BRT difference?
Neither zone observes daylight saving time, so the +1h offset between AST and BRT is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and BRT?
Not normally. The +1h gap only pushes the date over for late-evening times.
What is the time difference between AST and BRT?
BRT is +1h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is BRT in?
BRT operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
Which cities are in the BRT timezone?
Major cities in the BRT timezone include São Paulo, Rio de Janeiro, Brasília, Belo Horizonte, Salvador, Fortaleza, Recife, Curitiba.
What is the UTC offset for BRT?
Brasilia Time (BRT) is at UTC-03:00.
What should I know about the BRT timezone?
Brazil abolished daylight saving time in 2019. São Paulo is the largest city in the Southern Hemisphere.
When is it midnight in AST, what time is it in BRT?
When it is 12:00 AM (midnight) in AST (AST), it is +1h later in BRT (BRT).
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See every conversion from AST →·See every conversion from BRT →