MST to BRT Converter & Meeting Planner
Quick answer: 9:00 AM MST = 1:00 PM BRT (fixed -07:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Mountain Standard Time (MST) and Brasília Time (BRT)? You need to account for the standard time difference. Brasília Time is normally 4 hours ahead of Mountain Standard Time. Whether you are coordinating between teams in Denver and Phoenix and São Paulo and Rio de Janeiro, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM MST = 4:00 AM BRT. The full 24-hour MST to BRT table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM MST = 7:00 PM BRT.
| MST Time | BRT Time |
|---|---|
| 12:00 AM (00:00) | 4:00 AM (04:00) |
| 1:00 AM (01:00) | 5:00 AM (05:00) |
| 2:00 AM (02:00) | 6:00 AM (06:00) |
| 3:00 AM (03:00) | 7:00 AM (07:00) |
| 4:00 AM (04:00) | 8:00 AM (08:00) |
| 5:00 AM (05:00) | 9:00 AM (09:00) |
| 6:00 AM (06:00) | 10:00 AM (10:00) |
| 7:00 AM (07:00) | 11:00 AM (11:00) |
| 8:00 AM (08:00) | 12:00 PM (12:00) |
| 9:00 AM (09:00) | 1:00 PM (13:00) |
| 10:00 AM (10:00) | 2:00 PM (14:00) |
| 11:00 AM (11:00) | 3:00 PM (15:00) |
| 12:00 PM (12:00) | 4:00 PM (16:00) |
| 1:00 PM (13:00) | 5:00 PM (17:00) |
| 2:00 PM (14:00) | 6:00 PM (18:00) |
| 3:00 PM (15:00) | 7:00 PM (19:00) |
| 4:00 PM (16:00) | 8:00 PM (20:00) |
| 5:00 PM (17:00) | 9:00 PM (21:00) |
| 6:00 PM (18:00) | 10:00 PM (22:00) |
| 7:00 PM (19:00) | 11:00 PM (23:00) |
| 8:00 PM (20:00) | 12:00 AM (00:00)+1 day |
| 9:00 PM (21:00) | 1:00 AM (01:00)+1 day |
| 10:00 PM (22:00) | 2:00 AM (02:00)+1 day |
| 11:00 PM (23:00) | 3:00 AM (03:00)+1 day |
Best time to call São Paulo from Denver
For most work calls, compare the normal business day in Denver (MST) with the business day in São Paulo (BRT). MST commonly covers North America, while BRT is mainly associated with South America.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 9:00 AM - 3:00 PM MST, which corresponds to 12:00 PM - 6:00 PM BRT. This window sits inside the typical MST workday (9:00 AM - 5:00 PM) and the BRT workday (9:00 AM - 6:00 PM).
- DST Safety: MST or BRT may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- B3 (Brasil Bolsa Balcão): 10:00-17:00 local time in São Paulo.
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Frequently Asked Questions
What is the time difference between MST and BRT?
During standard time, Brasília Time is 4 hours ahead of Mountain Standard Time.
Does Arizona observe Daylight Saving Time?
Most of Arizona — including Phoenix, Tucson, and the state government — does not observe Daylight Saving Time, remaining on MST (UTC-7) year-round under a state law in effect since 1968. The significant exception is the Navajo Nation, which spans parts of northeastern Arizona, Utah, and New Mexico and does observe DST, creating one of the most complex intrastate time zone situations in the United States.
What is the difference between MST and MDT?
MST (Mountain Standard Time) is the winter offset at UTC-7:00, observed from the first Sunday in November through the second Sunday in March. MDT (Mountain Daylight Time) is the summer offset at UTC-6:00, applied when most Mountain Time regions advance their clocks by one hour during Daylight Saving Time.
Does Brazil observe Daylight Saving Time?
Brazil officially abolished Daylight Saving Time by presidential decree in April 2019, ending a practice that had been observed in the country's southeastern states since 1985. BRT has remained fixed at UTC-3:00 every day of the year since then, meaning the B3 stock exchange, federal government, and all Brazilian commercial operations run on a permanent, unchanging offset.
Is BRT the same as Argentina Time (ART)?
BRT (Brasília Time) and ART (Argentina Time) share the identical UTC-3:00 offset and neither country observes Daylight Saving Time, making São Paulo and Buenos Aires permanently synchronized on the same clock. Despite the different official designations, a meeting set for 10:00 BRT in São Paulo falls at exactly 10:00 ART in Buenos Aires — a fixed relationship that never shifts seasonally.