Offset
The time difference between Brasilia Time and Australian Central Time is 12.5 hours.
Brasilia Time (BRT) is behind Australian Central Time (ACST).
BRT: UTC-3
ACST: UTC+9:30
Neither Brasilia Time nor Australian Central Time is currently observing daylight saving time.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Brasilia Time and Australian Central Time don't overlap on the same weekday. Australian Central Time is 13 hours ahead of Brasilia Time.
With some flexibility, there are two workable windows outside standard hours, depending on which side takes the early or late slot:
- 7 AM–8 AM in Brasilia Time (7 PM–8 PM in Australian Central Time) — suggest 7:00 AM Brasilia Time (7:30 PM Australian Central Time).
- 7 PM–8 PM in Brasilia Time (7 AM–8 AM the next day in Australian Central Time) — suggest 7:00 PM Brasilia Time (7:30 AM Australian Central Time).
Either is an early start or late finish for one side, but workable for a one-off meeting.
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
Brazil
- New Year's DayThu, Jan 1
- CarnivalMon, Feb 16
- CarnivalTue, Feb 17
- Good FridayFri, Apr 3
- Easter SundaySun, Apr 5
- TiradentesTue, Apr 21
- Labour DayFri, May 1
- Corpus ChristiThu, Jun 4
- Independence DayMon, Sep 7
- Our Lady of AparecidaMon, Oct 12
- All Souls' DayMon, Nov 2
- Republic Proclamation DaySun, Nov 15
- Black Awareness DayFri, Nov 20
- Christmas DayFri, Dec 25
Australia
- New Year's DayThu, Jan 1
- Australia DayMon, Jan 26
- Good FridayFri, Apr 3
- Easter MondayMon, Apr 6
- Christmas DayFri, Dec 25
- St. Stephen's DayMon, Dec 28
About these zones
Brasilia Time is also known as BRT. To call Brazil, dial +55.
Australian Central Time is also known as ACST, or ACDT. To call Australia, dial +61.
Australian Central Time is approximately 8,400 miles south of Brasilia Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| BRT | ACST | Day |
|---|---|---|
| 12:00 am | 12:30 pm | Same day |
| 1:00 am | 1:30 pm | Same day |
| 2:00 am | 2:30 pm | Same day |
| 3:00 am | 3:30 pm | Same day |
| 4:00 am | 4:30 pm | Same day |
| 5:00 am | 5:30 pm | Same day |
| 6:00 am | 6:30 pm | Same day |
| 7:00 am | 7:30 pm | Same day |
| 8:00 am | 8:30 pm | Same day |
| 9:00 am | 9:30 pm | Same day |
| 10:00 am | 10:30 pm | Same day |
| 11:00 am | 11:30 pm | Same day |
| 12:00 pm | 12:30 am | +1 day |
| 1:00 pm | 1:30 am | +1 day |
| 2:00 pm | 2:30 am | +1 day |
| 3:00 pm | 3:30 am | +1 day |
| 4:00 pm | 4:30 am | +1 day |
| 5:00 pm | 5:30 am | +1 day |
| 6:00 pm | 6:30 am | +1 day |
| 7:00 pm | 7:30 am | +1 day |
| 8:00 pm | 8:30 am | +1 day |
| 9:00 pm | 9:30 am | +1 day |
| 10:00 pm | 10:30 am | +1 day |
| 11:00 pm | 11:30 am | +1 day |
Daylight saving time
Australian Central Time observes daylight saving time; Brasilia Time does not. The offset between the two zones changes when Australian Central Time transitions: on Sunday, October 4, 2026, clocks spring forward from ACST to ACDT.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 6:44 AM
- Sunset
- 5:28 PM
- Day length
- 10h 45m
- Sunrise
- 7:18 AM
- Sunset
- 5:12 PM
- Day length
- 9h 55m
Cities in these zones
Cities in Brasilia Time
Cities in Australian Central Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Brasilia Time
- CGH
- GRU
- GIG
- SDU
- CNF
- BSB
- CWB
- GYN
- POA
Airports in Australian Central Time
- ADL
Related conversions
Common conversions
- What is 9:00 am BRT in ACST?
- 9:00 am BRT is 9:30 pm ACST.
- What is 12:00 pm BRT in ACST?
- 12:00 pm BRT is 12:30 am ACST, the next day.
- What is 12:30 pm BRT in ACST?
- 12:30 pm BRT is 1:00 am ACST, the next day.
- What is 2:00 pm BRT in ACST?
- 2:00 pm BRT is 2:30 am ACST, the next day.
- What is 5:00 pm BRT in ACST?
- 5:00 pm BRT is 5:30 am ACST, the next day.
- What is 11:30 pm BRT in ACST?
- 11:30 pm BRT is 12:00 pm ACST, the next day.