Time in MST and ADT
The time difference between Mountain Standard Time (MST) and Atlantic Daylight Time (ADT) is 4 hours. Atlantic Daylight Time is 4 hours ahead of Mountain Standard Time.
This means 9am MST is 1pm ADT and 5pm MST is 9pm ADT.
Mountain Standard Time
- The current local time in MST is 3:24 am (July 3, 2026)
- MST time zone offset is UTC-07:00
Atlantic Daylight Time
- The current local time in ADT is 11:24 pm (July 2, 2026)
- ADT time zone offset is UTC-03:00
How to convert Mountain Standard Time to Atlantic Daylight Time?
Add 4 hours to Mountain Standard Time to get Atlantic Daylight Time.
Time in MST
00:00
Time in ADT
00:00
Use the slider above to convert Mountain Standard Time to Atlantic Daylight Time and view the day and night map at different times.
Day–night colors on the map:
Day
Civil twilight
Nautical twilight
Astronomical twilight
NightTime Conversion Chart
| MST | ADT |
|---|---|
| 12am | 4am |
| 1am | 5am |
| 2am | 6am |
| 3am | 7am |
| 4am | 8am |
| 5am | 9am |
| 6am | 10am |
| 7am | 11am |
| 8am | 12pm |
| 9am | 1pm |
| 10am | 2pm |
| 11am | 3pm |
| 12pm | 4pm |
| 1pm | 5pm |
| 2pm | 6pm |
| 3pm | 7pm |
| 4pm | 8pm |
| 5pm | 9pm |
| 6pm | 10pm |
| 7pm | 11pm |
| 8pm | 12am |
| 9pm | 1am |
| 10pm | 2am |
| 11pm | 3am |