MST to Rio de Janeiro Time Converter
BRT is 4 hours ahead of MST. 9:00 AM MST = 1:00 PM BRT.
BRT is 4 hours ahead of MST at the moment. To convert MST to Rio de Janeiro Time, add 4 hours to the MST time: 9:00 AM MST = 1:00 PM BRT.
MST (Mountain Time) is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year. Rio de Janeiro Time (Rio de Janeiro time) is used in Rio de Janeiro, Brazil.
Most of Arizona uses MST all year and does not switch to MDT.
MST to Rio de Janeiro Time time conversion table
MST to Rio de Janeiro Time on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| MST | Rio de Janeiro Time | Day |
|---|---|---|
| 12:00 AM MST | 4:00 AM BRT | night |
| 1:00 AM MST | 5:00 AM BRT | night |
| 2:00 AM MST | 6:00 AM BRT | — |
| 3:00 AM MST | 7:00 AM BRT | — |
| 4:00 AM MST | 8:00 AM BRT | — |
| 5:00 AM MST | 9:00 AM BRT | — |
| 6:00 AM MST | 10:00 AM BRT | — |
| 7:00 AM MST | 11:00 AM BRT | — |
| 8:00 AM MST | 12:00 PM BRT | — |
| 9:00 AM MST | 1:00 PM BRT | work hours |
| 10:00 AM MST | 2:00 PM BRT | work hours |
| 11:00 AM MST | 3:00 PM BRT | work hours |
| 12:00 PM MST | 4:00 PM BRT | work hours |
| 1:00 PM MST | 5:00 PM BRT | — |
| 2:00 PM MST | 6:00 PM BRT | — |
| 3:00 PM MST | 7:00 PM BRT | — |
| 4:00 PM MST | 8:00 PM BRT | — |
| 5:00 PM MST | 9:00 PM BRT | — |
| 6:00 PM MST | 10:00 PM BRT | night |
| 7:00 PM MST | 11:00 PM BRT | night |
| 8:00 PM MST | 12:00 AM BRT | next day |
| 9:00 PM MST | 1:00 AM BRT | next day |
| 10:00 PM MST | 2:00 AM BRT | next day |
| 11:00 PM MST | 3:00 AM BRT | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert MST to Rio de Janeiro Time
Add 4 hours to the MST time to get Rio de Janeiro Time.
Example: 9:00 AM MST = 1:00 PM BRT.
Across midnight: 10:00 PM MST = 2:00 AM BRT (next day). The date changes, so always check the day as well as the hour.
Time difference between MST and Rio de Janeiro Time
The time difference between MST and Rio de Janeiro Time is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 31 Dec 2025 – 7 Mar 2026: Rio de Janeiro Time is 4 hours ahead of MST.
- 8 Mar 2026 – 31 Oct 2026: Rio de Janeiro Time is 3 hours ahead of MST.
- 1 Nov 2026 – 30 Dec 2026: Rio de Janeiro Time is 4 hours ahead of MST.
MST and Rio de Janeiro Time during daylight saving time
- MST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from MST (UTC−7) to MDT (UTC−6).
- Rio de Janeiro Time does not observe daylight saving time; it stays on UTC−3 all year.
Best time for a meeting between MST and Rio de Janeiro Time
MST and Rio de Janeiro Time share 4 hours of the 9 AM–5 PM working day. Any time between 9:00 AM and 1:00 PM MST lands between 1:00 PM and 5:00 PM BRT, inside working hours for both.
MST to Rio de Janeiro Time FAQ
What is the time difference between MST and Rio de Janeiro Time?
Right now BRT is 4 hours ahead of MST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM MST in Rio de Janeiro Time?
9:00 AM MST is 1:00 PM BRT.
What is 12 PM (noon) MST in Rio de Janeiro Time?
12:00 PM MST is 4:00 PM BRT.
Is Rio de Janeiro Time ahead of or behind MST?
BRT is 4 hours ahead of MST, so it is later in Rio de Janeiro Time than in MST.
Does MST change for daylight saving time?
Yes. MST next changes on 14 Mar 2027, when clocks go forward one hour from MST to MDT.
Does Rio de Janeiro Time change for daylight saving time?
No. Rio de Janeiro Time stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between MST and Rio de Janeiro Time?
MST and Rio de Janeiro Time share 4 hours of the 9 AM–5 PM working day. Any time between 9:00 AM and 1:00 PM MST lands between 1:00 PM and 5:00 PM BRT, inside working hours for both.
Is MT the same as MST?
MST is the winter (standard) name of Mountain Time (MT). From March to November the same clocks are called MDT. This converter always uses the one in force on the date you choose.
Related conversions
Convert Rio de Janeiro Time to MST
Convert MST to other time zones
Convert other time zones to Rio de Janeiro Time
Updated 6 November 2026. Time zone data: IANA tz database.