Mountain Standard Time
MST means UTC−07:00 throughout the year. Mountain Time follows regional clock rules and uses UTC−07:00 on your selected date.
Use MT for local civil time →TIME ZONE CONVERTER
ET to MST
Time Converter
Convert Eastern Time to Mountain Standard Time. Compare dates, seasonal differences and meeting hours.
ET is 2h or 3h ahead of MST in 2026, depending on the date.
9 AM ET = 7 AM MST
Selected date: November 10, 2026. Fixed abbreviations retain their stated UTC offsets.
THE QUICK REFERENCE
CSVET to MST conversion table
November 10, 2026 · Date changes are marked.
View the full 24-hour table
| ET | MST |
|---|---|
| 12:00 AM | 10:00 PM -1 day |
| 1:00 AM | 11:00 PM -1 day |
| 2:00 AM | 12:00 AM |
| 3:00 AM | 1:00 AM |
| 4:00 AM | 2:00 AM |
| 5:00 AM | 3:00 AM |
| 6:00 AM | 4:00 AM |
| 7:00 AM | 5:00 AM |
| 8:00 AM | 6:00 AM |
| 9:00 AM | 7:00 AM |
| 10:00 AM | 8:00 AM |
| 11:00 AM | 9:00 AM |
| ET | MST |
|---|---|
| 12:00 PM | 10:00 AM |
| 1:00 PM | 11:00 AM |
| 2:00 PM | 12:00 PM |
| 3:00 PM | 1:00 PM |
| 4:00 PM | 2:00 PM |
| 5:00 PM | 3:00 PM |
| 6:00 PM | 4:00 PM |
| 7:00 PM | 5:00 PM |
| 8:00 PM | 6:00 PM |
| 9:00 PM | 7:00 PM |
| 10:00 PM | 8:00 PM |
| 11:00 PM | 9:00 PM |
Starting with the MST working day
These examples start on 2026-11-10 in MST.
09:00 MST11:00 →ET · 2026-11-10
17:00 MST19:00 →ET · 2026-11-10
Which time-zone meaning are we using?
Eastern Time
ET follows America/New_York. On your selected date it uses UTC−05:00 (EST). Its offset can change when the regional clock rules change.
Fixed alternatives: EST (UTC−05:00) · EDT (UTC−04:00). These labels keep their stated UTC offset throughout the year.
ONE CLOCK TIME. THE WHOLE YEAR.
Year CSV09:00 ET to MST throughout 2026
Keeping 09:00 on the ET clock produces 2 different destination clock/date answers in 2026. The ranges below use ET calendar dates, including transition days.
| Dates in ET · 2026 | MST answer | Source → destination offsets | Explore |
|---|---|---|---|
| Jan 1 – Mar 766 dates | 07:00Same date | UTC−05:00 → UTC−07:00 | |
| Mar 8 – Oct 31238 dates | 06:00Same date | UTC−04:00 → UTC−07:00 | |
| Nov 1 – Dec 3161 dates | 07:00Same date | UTC−05:00 → UTC−07:00 |
Every calendar date is included, not just workdays. Date ranges include both endpoints. Based on IANA 2026e; future rules may change.
DON’T LOSE A DAY
When does ET time become a different date in MST?
Your complete source day: 2026-11-10. Each range shows which destination date to use.
ET · 2026-11-1000:00–02:00UTC−05:00
MST · 2026-11-0922:00–24:00UTC−07:00 Previous day
ET · 2026-11-1002:00–24:00UTC−05:00
MST · 2026-11-1000:00–22:00UTC−07:00 Same date
Range starts are included; ends are excluded. 24:00 means midnight at the end of that date. Repeated hours appear separately with their UTC offsets. The strip is proportional to elapsed time.
THE BIGGER PICTURE
2026A year of time differences.
How MST compares with ET throughout 2026.
JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
−2h
−3h
−2h
ET changes its UTC offset in 2026. MST is a fixed offset.
See exact change periods
| From (UTC, inclusive) | Until (UTC, exclusive) | MST vs ET |
|---|---|---|
| 1 Jan 2026, 00:00 UTC | 8 Mar 2026, 07:00 UTC | 2h behind |
| 8 Mar 2026, 07:00 UTC | 1 Nov 2026, 06:00 UTC | 3h behind |
| 1 Nov 2026, 06:00 UTC | 1 Jan 2027, 00:00 UTC | 2h behind |
CLOCK CHANGES
What changes at the next clock adjustment?
Exact periods outside the most common difference in 2026
The most frequent difference has MST 3h behind relative to ET. Exceptions:
| From (UTC, inclusive) | Until (UTC, exclusive) | Compared with ET |
|---|---|---|
| 1 Jan 2026, 00:00 UTC | 8 Mar 2026, 07:00 UTC | 2h behind |
| 1 Nov 2026, 06:00 UTC | 1 Jan 2027, 00:00 UTC | 2h behind |
PLAN BEYOND A SINGLE DAY
Daily CSVET–MST working hours through 2026
Every date calculated with your working windows. 261 selected ET workdays; public holidays are not applied.
Least shared time5h
Most common5h
Most shared time6h
Days without a 60-min slot0 / 261
A start time that survives the whole year.
Start a 60-minute meeting in ET 12:00–16:00.
These starts fit both working windows on every selected ET workday in 2026, using a 15-minute start grid. The end of each range is the last valid start.
ET: 09:00–17:00, Mon, Tue, Wed, Thu, Fri. MST: 09:00–17:00, Mon, Tue, Wed, Thu, Fri.
Calculation details and repeated hours
Overnight shifts belong to their start weekday. Host workday means the source calendar date. Repeated local times use the first occurrence.
THE DETAILS THAT MATTER
ET to MST: useful answers
Why is the ET to MST difference sometimes 2 hours and sometimes 3 hours?
ET is 2h or 3h ahead of MST in 2026, depending on the date. ET changes its UTC offset in 2026. MST is a fixed offset.
Is MST the same as local city time?
MST is fixed at UTC−07:00. New York (ET) to Denver (MT) uses regional rules instead. On 2026-11-10, 09:00 at the source becomes 07:00 at the destination (MST). Choose the local-city option above when that is the clock you mean.
Which cities match MST throughout 2026?
Phoenix, United States keep the same UTC−07:00 offset as fixed MST throughout 2026 under the published rules. Matching an offset does not mean every place uses the abbreviation MST.
Does the ET–MST time difference change in 2026?
The published rules produce 3 periods with 2 different offsets in 2026. See the annual chart for the exact boundaries of each period.
Does this conversion change the calendar date?
09:00 in ET on 2026-11-10 is 07:00 in MST on 2026-11-10. This selected time stays on the same date in both places. Other times can cross midnight.
Can ET and MST meet during working hours?
Your selected working windows share 6h on 2026-11-10. The planner above checks the whole meeting duration and shows suitable start times. Edit the windows to match your team.
Related time-zone meanings and conversions
Calculated with IANA 2026e. Working hours are your preferences; public holidays and calendar availability are not included. Our methodology