Ottawa Time to MST Converter
MST is 2 hours behind EST. 9:00 AM EST = 7:00 AM MST.
MST is 2 hours behind EST. To convert Ottawa Time to MST, subtract 2 hours from the Ottawa Time time: 9:00 AM EST = 7:00 AM MST.
Ottawa Time (Ottawa time) is used in Ottawa, Canada. MST (Mountain Time) is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year.
Most of Arizona uses MST all year and does not switch to MDT.
Ottawa Time to MST time conversion table
Ottawa Time to MST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| Ottawa Time | MST | Day |
|---|---|---|
| 12:00 AM EST | 10:00 PM MST | previous day |
| 1:00 AM EST | 11:00 PM MST | previous day |
| 2:00 AM EST | 12:00 AM MST | night |
| 3:00 AM EST | 1:00 AM MST | night |
| 4:00 AM EST | 2:00 AM MST | night |
| 5:00 AM EST | 3:00 AM MST | night |
| 6:00 AM EST | 4:00 AM MST | night |
| 7:00 AM EST | 5:00 AM MST | night |
| 8:00 AM EST | 6:00 AM MST | — |
| 9:00 AM EST | 7:00 AM MST | — |
| 10:00 AM EST | 8:00 AM MST | — |
| 11:00 AM EST | 9:00 AM MST | work hours |
| 12:00 PM EST | 10:00 AM MST | work hours |
| 1:00 PM EST | 11:00 AM MST | work hours |
| 2:00 PM EST | 12:00 PM MST | work hours |
| 3:00 PM EST | 1:00 PM MST | work hours |
| 4:00 PM EST | 2:00 PM MST | work hours |
| 5:00 PM EST | 3:00 PM MST | — |
| 6:00 PM EST | 4:00 PM MST | — |
| 7:00 PM EST | 5:00 PM MST | — |
| 8:00 PM EST | 6:00 PM MST | — |
| 9:00 PM EST | 7:00 PM MST | — |
| 10:00 PM EST | 8:00 PM MST | — |
| 11:00 PM EST | 9:00 PM MST | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert Ottawa Time to MST
Subtract 2 hours from the Ottawa Time time to get MST.
Example: 9:00 AM EST = 7:00 AM MST.
Across midnight: 1:00 AM EST = 11:00 PM MST (previous day). The date changes, so always check the day as well as the hour.
Time difference between Ottawa Time and MST
The time difference between Ottawa Time and MST is 2 hours all year – MST is behind EST.
Ottawa Time and MST during daylight saving time
- Ottawa Time next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from EST (UTC−5) to EDT (UTC−4).
- MST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from MST (UTC−7) to MDT (UTC−6).
Best time for a meeting between Ottawa Time and MST
Ottawa Time and MST share 6 hours of the 9 AM–5 PM working day. Any time between 11:00 AM and 5:00 PM EST lands between 9:00 AM and 3:00 PM MST, inside working hours for both.
Ottawa Time to MST FAQ
What is the time difference between Ottawa Time and MST?
MST is 2 hours behind EST all year. 9:00 AM EST = 7:00 AM MST.
What is 9 AM Ottawa Time in MST?
9:00 AM EST is 7:00 AM MST.
What is 12 PM (noon) Ottawa Time in MST?
12:00 PM EST is 10:00 AM MST.
Is MST ahead of or behind Ottawa Time?
MST is 2 hours behind EST, so it is earlier in MST than in Ottawa Time.
Does Ottawa Time change for daylight saving time?
Yes. Ottawa Time next changes on 14 Mar 2027, when clocks go forward one hour from EST to EDT.
Does MST change for daylight saving time?
Yes. MST next changes on 14 Mar 2027, when clocks go forward one hour from MST to MDT.
What is the best time for a meeting between Ottawa Time and MST?
Ottawa Time and MST share 6 hours of the 9 AM–5 PM working day. Any time between 11:00 AM and 5:00 PM EST lands between 9:00 AM and 3:00 PM MST, inside working hours for both.
Is MT the same as MST?
MST is the winter (standard) name of Mountain Time (MT). From March to November the same clocks are called MDT. This converter always uses the one in force on the date you choose.
Related conversions
Convert MST to Ottawa Time
Convert Ottawa Time to other time zones
Convert other time zones to MST
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.