What is BRT in MST?
Mountain Time is 3 hours behind
Brasília Time is on UTC−3:00 and Mountain Time is on UTC−6:00 right now. Mountain Time is on daylight saving, so its clocks read MDT. The gap changes during the year — see below.
- Time in São Paulo
- 11:14 pm
- Time in Denver
- 8:14 pm
- Difference
- −3 h
- Next clock change
- November 1, 2026
Convert a time
MDT — Mountain Time
8:00 pm
Tue
When the difference changes
Brasília Time and Mountain Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:
- Now – November 1, 2026Mountain Time is 3 hours behind
- November 1, 2026 – March 14, 2027Mountain Time is 4 hours behind
- March 14, 2027 – onwardsMountain Time is 3 hours behind
Periods shorter than a day are not listed: both zones change at 2am in their own local time, so there are a few hours on each transition date when the gap is briefly something else.
Daylight saving
Brasília Time
Brasília Time stays on BRT all year, so its offset from UTC never moves.
Mountain Time
Clocks go back one hour at 2am local time, becoming MST.
BRT to MST conversion table
Every hour of Tuesday, September 22, 2026, converted from Brasília Time to Mountain Time. 3 of the 24 hours fall on a different calendar day in Denver, which is marked.
- 12:00 am BRT
- 9:00 pm MDT−1 day
- 1:00 am BRT
- 10:00 pm MDT−1 day
- 2:00 am BRT
- 11:00 pm MDT−1 day
- 3:00 am BRT
- 12:00 am MDT
- 4:00 am BRT
- 1:00 am MDT
- 5:00 am BRT
- 2:00 am MDT
- 6:00 am BRT
- 3:00 am MDT
- 7:00 am BRT
- 4:00 am MDT
- 8:00 am BRT
- 5:00 am MDT
- 9:00 am BRT
- 6:00 am MDT
- 10:00 am BRT
- 7:00 am MDT
- 11:00 am BRT
- 8:00 am MDT
- 12:00 pm BRT
- 9:00 am MDT
- 1:00 pm BRT
- 10:00 am MDT
- 2:00 pm BRT
- 11:00 am MDT
- 3:00 pm BRT
- 12:00 pm MDT
- 4:00 pm BRT
- 1:00 pm MDT
- 5:00 pm BRT
- 2:00 pm MDT
- 6:00 pm BRT
- 3:00 pm MDT
- 7:00 pm BRT
- 4:00 pm MDT
- 8:00 pm BRT
- 5:00 pm MDT
- 9:00 pm BRT
- 6:00 pm MDT
- 10:00 pm BRT
- 7:00 pm MDT
- 11:00 pm BRT
- 8:00 pm MDT
Scheduling between the two
Working hours overlap from 12:00 pm to 6:00 pm BRT, which is 9:00 am to 3:00 pm MDT. Anything inside that window falls in the normal working day at both ends.
Brasília Time (BRT) is used in Rio de Janeiro and Brasília. Brazil ended daylight saving in 2019.
Mountain Time (MDT) is used in Salt Lake City, Albuquerque and Calgary. Arizona keeps MST all year and does not follow MDT.