BRT to MST Time Converter
MST is 3 hours behind BRT. BRT is UTC-3:00, and The US Mountain states are currently on MDT (UTC-6:00).
Best Time to Call Between BRT and MST
Both zones are inside normal business hours between 12:00 PM and 5:00 PM BRT — that's 9:00 AM to 2:00 PM MST. That's a 5-hour window.
both at work BRT only MST only neither — hours along the strip are BRT.
Common Times Converted
BRT on the left, MST on the right.
BRT to MST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| BRT | MST | Working hours |
|---|---|---|
| 12:00 AM | 9:00 PM prev day | — |
| 1:00 AM | 10:00 PM prev day | — |
| 2:00 AM | 11:00 PM prev day | — |
| 3:00 AM | 12:00 AM | — |
| 4:00 AM | 1:00 AM | — |
| 5:00 AM | 2:00 AM | — |
| 6:00 AM | 3:00 AM | — |
| 7:00 AM | 4:00 AM | — |
| 8:00 AM | 5:00 AM | — |
| 9:00 AM | 6:00 AM | BRT only |
| 10:00 AM | 7:00 AM | BRT only |
| 11:00 AM | 8:00 AM | BRT only |
| 12:00 PM | 9:00 AM | Both zones |
| 1:00 PM | 10:00 AM | Both zones |
| 2:00 PM | 11:00 AM | Both zones |
| 3:00 PM | 12:00 PM | Both zones |
| 4:00 PM | 1:00 PM | Both zones |
| 5:00 PM | 2:00 PM | MST only |
| 6:00 PM | 3:00 PM | MST only |
| 7:00 PM | 4:00 PM | MST only |
| 8:00 PM | 5:00 PM | — |
| 9:00 PM | 6:00 PM | — |
| 10:00 PM | 7:00 PM | — |
| 11:00 PM | 8:00 PM | — |
What BRT and MST Actually Are
BRT — Brasília Time
São Paulo, Rio de Janeiro, Brasília, Salvador. Standing at UTC-3:00 as written, and the region does not change its clocks, so that offset holds all year. Brazil abolished daylight saving in 2019, so this offset no longer shifts in the southern summer.
Brazil ran daylight saving for decades before abolishing it in 2019, on the argument that changed electricity consumption patterns had erased the savings.
MST — Mountain Standard Time
Denver, Salt Lake City, Calgary — and Phoenix year-round. Standing at UTC-7:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to MST. Arizona stays on MST all year, so Phoenix and Denver are an hour apart for eight months and identical for four.
Arizona has stayed on MST year-round since 1968 — the Navajo Nation within it does observe daylight saving, making the state a patchwork.
What This Means in Practice
This gap is not fixed
MST changes its clocks and BRT does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, November 1, 2026 unless someone resets it.
Major Cities in Each Zone
Cities on BRT
Cities on MST
Frequently Asked Questions
What is the time difference between BRT and MST?
MST is 3 hours behind BRT. That is the live figure. Taken strictly as written, the gap between BRT and MST is 4 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM BRT in MST?
9:00 AM BRT is 6:00 AM MST.
What are the best hours to schedule a call between BRT and MST?
Between 12:00 PM and 5:00 PM BRT, which is 9:00 AM to 2:00 PM MST. Both sides are inside normal business hours through that window.
Does the difference between BRT and MST change during the year?
Yes. MST observes daylight saving and BRT does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, November 1, 2026.
Does BRT always mean Brasília Time?
Brazil abolished daylight saving in 2019, so this offset no longer shifts in the southern summer.
Does MST always mean Mountain Standard Time?
Arizona stays on MST all year, so Phoenix and Denver are an hour apart for eight months and identical for four.