Offset
The time difference between Santo Domingo and Mountain Time is 2 hours.
Santo Domingo (AST) is ahead of Mountain Time (MDT).
AST: UTC-4
MDT: UTC-6
Mountain Time is currently observing daylight saving time; Santo Domingo is not.
When to schedule
Business-hours overlap: 11 AM–5 PM in Santo Domingo (9 AM–3 PM in Mountain Time).
Both teams are in working hours during this window on weekdays.
Suggested time: 2:00 PM Santo Domingo (12:00 PM Mountain Time).
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
Dominican Republic
- New Year's DayThu, Jan 1
- Day of KingsTue, Jan 6
- Our Lady of AltagraciaWed, Jan 21
- Duarte's BirthdayMon, Jan 26
- Independence DayFri, Feb 27
- Good FridayFri, Apr 3
- Labour DayFri, May 1
- Mother's DayThu, May 28
- Corpus ChristiThu, Jun 4
- Restoration DaySun, Aug 16
- Our Lady of MercyThu, Sep 24
- Constitution DayFri, Nov 6
- Christmas DayFri, Dec 25
United States
- New Year's DayThu, Jan 1
- Martin Luther King, Jr. DayMon, Jan 19
- Presidents DayMon, Feb 16
- Memorial DayMon, May 25
- Juneteenth National Independence DayFri, Jun 19
- Independence DayFri, Jul 3
- Labour DayMon, Sep 7
- Columbus DayMon, Oct 12
- Veterans DayWed, Nov 11
- Thanksgiving DayThu, Nov 26
- Christmas DayFri, Dec 25
About these zones
Santo Domingo uses Atlantic Standard Time. To call Dominican Republic, dial +1-809 and 1-829.
Mountain Time is also known as MST, or MDT. To call United States, dial +1.
Mountain Time is approximately 2,550 miles northwest of Santo Domingo.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Santo Domingo | MST | Day |
|---|---|---|
| 12:00 am | 10:00 pm | -1 day |
| 1:00 am | 11:00 pm | -1 day |
| 2:00 am | 12:00 am | Same day |
| 3:00 am | 1:00 am | Same day |
| 4:00 am | 2:00 am | Same day |
| 5:00 am | 3:00 am | Same day |
| 6:00 am | 4:00 am | Same day |
| 7:00 am | 5:00 am | Same day |
| 8:00 am | 6:00 am | Same day |
| 9:00 am | 7:00 am | Same day |
| 10:00 am | 8:00 am | Same day |
| 11:00 am | 9:00 am | Same day |
| 12:00 pm | 10:00 am | Same day |
| 1:00 pm | 11:00 am | Same day |
| 2:00 pm | 12:00 pm | Same day |
| 3:00 pm | 1:00 pm | Same day |
| 4:00 pm | 2:00 pm | Same day |
| 5:00 pm | 3:00 pm | Same day |
| 6:00 pm | 4:00 pm | Same day |
| 7:00 pm | 5:00 pm | Same day |
| 8:00 pm | 6:00 pm | Same day |
| 9:00 pm | 7:00 pm | Same day |
| 10:00 pm | 8:00 pm | Same day |
| 11:00 pm | 9:00 pm | Same day |
Daylight saving time
Mountain Time observes daylight saving time; Santo Domingo does not. The offset between the two zones changes when Mountain Time transitions: on Sunday, November 1, 2026, clocks fall back from MDT to MST.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 6:16 AM
- Sunset
- 7:18 PM
- Day length
- 13h 2m
- Sunrise
- 5:53 AM
- Sunset
- 8:21 PM
- Day length
- 14h 28m
Daylight overlap: 11h 25m — 7:53 AM–7:18 PM in Santo Domingo (5:53 AM–5:18 PM in Mountain Time). Both locations are in daylight during this window.
Cities in these zones
Cities in Mountain Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Atlantic Standard Time
- JBQ
- SDQ
Airports in Mountain Time
- BJC
- DEN
- OGD
- SLC
Related conversions
Common conversions
- What is 9:00 am Santo Domingo in MST?
- 9:00 am Santo Domingo is 7:00 am MST.
- What is 12:00 pm Santo Domingo in MST?
- 12:00 pm Santo Domingo is 10:00 am MST.
- What is 12:30 pm Santo Domingo in MST?
- 12:30 pm Santo Domingo is 10:30 am MST.
- What is 2:00 pm Santo Domingo in MST?
- 2:00 pm Santo Domingo is 12:00 pm MST.
- What is 5:00 pm Santo Domingo in MST?
- 5:00 pm Santo Domingo is 3:00 pm MST.
- What is 11:30 pm Santo Domingo in MST?
- 11:30 pm Santo Domingo is 9:30 pm MST.