United States to MST time conversion
MST is 3 hours behind United States. After the next clock change (): MST is 2 hours behind United States.
MST is always UTC-7. Right now most places that use MST are on MDT (UTC-6): MDT is 2 hours behind United States.
Time difference with your location
United States is 4 hours behind UTC. Compare with your local time →
Choose a date and time
Choose the local time in United States to convert it to MST on that date.
Skipped clock-change times are unavailable; a repeated time uses its first occurrence.
24-hour conversion chart · United States → MST
This table converts each hour in United States to MST on 2026-10-21.
- Working hours
- Outside working hours
- Night hours
| United States | MST | Shared working hours |
|---|---|---|
| 00:0012:00 AM | 21:009:00 PM -1 day | |
| 01:001:00 AM | 22:0010:00 PM -1 day | |
| 02:002:00 AM | 23:0011:00 PM -1 day | |
| 03:003:00 AM | 00:0012:00 AM | |
| 04:004:00 AM | 01:001:00 AM | |
| 05:005:00 AM | 02:002:00 AM | |
| 06:006:00 AM | 03:003:00 AM | |
| 07:007:00 AM | 04:004:00 AM | |
| 08:008:00 AM | 05:005:00 AM | |
| 09:009:00 AM | 06:006:00 AM | |
| 10:0010:00 AM | 07:007:00 AM | |
| 11:0011:00 AM | 08:008:00 AM | ✓ |
| 12:0012:00 PM | 09:009:00 AM | ✓ |
| 13:001:00 PM | 10:0010:00 AM | ✓ |
| 14:002:00 PM | 11:0011:00 AM | ✓ |
| 15:003:00 PM | 12:0012:00 PM | ✓ |
| 16:004:00 PM | 13:001:00 PM | ✓ |
| 17:005:00 PM | 14:002:00 PM | ✓ |
| 18:006:00 PM | 15:003:00 PM | |
| 19:007:00 PM | 16:004:00 PM | |
| 20:008:00 PM | 17:005:00 PM | |
| 21:009:00 PM | 18:006:00 PM | |
| 22:0010:00 PM | 19:007:00 PM | |
| 23:0011:00 PM | 20:008:00 PM |
Quick conversion examples
These examples use United States (UTC-4) and MST (UTC-7); choosing a date applies the local clock changes.
Conversion formula: MST = United States − 3h · United States − 2h · MDT = United States − 2h · MDT = United States − 1h.
| United States | MST |
|---|---|
| 6:00 AM United States | = 3:00 AM MST |
| 7:00 AM United States | = 4:00 AM MST |
| 8:00 AM United States | = 5:00 AM MST |
| 9:00 AM United States | = 6:00 AM MST |
| 10:00 AM United States | = 7:00 AM MST |
| 12:00 PM United States | = 9:00 AM MST |
| 3:00 PM United States | = 12:00 PM MST |
| 5:00 PM United States | = 2:00 PM MST |
| 6:00 PM United States | = 3:00 PM MST |
| 8:00 PM United States | = 5:00 PM MST |
Overlapping meeting hours
The 08:00–18:00 working day in United States and MST overlaps for 7 hours on 2026-10-21.
- Shared working hours
- 11:00–18:00 United States · 08:00–15:00 MST
Clock changes on both sides, 2026–2028
United States and MST have the following local clock changes in 2026–2028; all times in the table are local to that side.
| Year | United States | MST |
|---|---|---|
| 2026 | · 02:00 → 03:00 · 02:00 → 01:00 | · 02:00 → 03:00 · 02:00 → 01:00 |
| 2027 | · 02:00 → 03:00 · 02:00 → 01:00 | · 02:00 → 03:00 · 02:00 → 01:00 |
| 2028 | · 02:00 → 03:00 · 02:00 → 01:00 | · 02:00 → 03:00 · 02:00 → 01:00 |
At the start of 2026, MST is 2 hours behind United States. The difference changes during the following periods.
- From 2026-03-08 03:00 United States until 2026-03-08 05:00 United States, MST is 3 hours behind United States.
- From 2026-11-01 01:00 United States until 2026-11-01 03:00 United States, MDT is 1 hour behind United States.
- From 2027-03-14 03:00 United States until 2027-03-14 05:00 United States, MST is 3 hours behind United States.
- From 2027-11-07 01:00 United States until 2027-11-07 03:00 United States, MDT is 1 hour behind United States.
- From 2028-03-12 03:00 United States until 2028-03-12 05:00 United States, MST is 3 hours behind United States.
- From 2028-11-05 01:00 United States until 2028-11-05 03:00 United States, MDT is 1 hour behind United States.
Frequently asked questions
What time is 9 AM United States in MST?
9:00 AM United States = 6:00 AM MST, using UTC-4 and UTC-7. Choose a date above for the seasonal local time.
Does the time difference between United States and MST change during the year?
Yes. During 2026–2028: MST is 3 hours behind United States; MST is 2 hours behind United States; MST is 1 hour behind United States. The clock-change table gives the dates for both sides.
How do I tell whether it is day or night in MST?
Read the MST clock above: this guide counts 06:00–18:00 local time as daytime and the rest as nighttime, without using sunrise and sunset.
What is the best time to call between United States and MST?
The shared 08:00–18:00 working window is 11:00–18:00 United States / 08:00–15:00 MST, a total of 7 hours.
What is the time difference between United States and MST now?
Right now, MST is 3 hours behind United States. Conversion formula: MST = United States − 3h · United States − 2h · MDT = United States − 2h · MDT = United States − 1h.