MST to ART Converter & Meeting Planner
Quick answer: 9:00 AM MST = 1:00 PM ART (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 Argentina Time (ART)? You need to account for the standard time difference. Argentina Time is normally 4 hours ahead of Mountain Standard Time. Whether you are coordinating between teams in Denver and Phoenix and Buenos Aires and Córdoba, 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 ART. The full 24-hour MST to ART table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM MST = 7:00 PM ART.
| MST Time | ART 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 Buenos Aires from Denver
For most work calls, compare the normal business day in Denver (MST) with the business day in Buenos Aires (ART). MST commonly covers North America, while ART 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 ART. This window sits inside the typical MST workday (9:00 AM - 5:00 PM) and the ART workday (9:00 AM - 6:00 PM).
- DST Safety: MST or ART may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Buenos Aires Stock Exchange (BCBA): 11:00-17:00 local time in Buenos Aires.
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Frequently Asked Questions
What is the time difference between MST and ART?
During standard time, Argentina 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 Argentina observe Daylight Saving Time?
Argentina permanently abolished Daylight Saving Time in 2009 after years of inconsistent observance. Since then, ART has remained fixed at UTC-03:00 every day of the year, with no seasonal clock changes of any kind.
Are Argentina Time (ART) and Brasilia Time (BRT) the same?
ART and BRT are distinct, separately designated time zones, but they currently share the exact same UTC-03:00 offset. Because neither Argentina nor Brazil's southeastern states currently observe DST, the two zones remain perfectly aligned year-round — though that alignment could change if either country's DST policy shifts.