MST to HST Converter
HST is 3 hours behind MST. 9:00 AM MST = 6:00 AM HST.
HST is 3 hours behind MST at the moment. To convert MST to HST, subtract 3 hours from the MST time: 9:00 AM MST = 6:00 AM HST.
MST (Mountain Time) is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year. HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time).
Most of Arizona uses MST all year and does not switch to MDT.
MST to HST time conversion table
MST to HST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| MST | HST | Day |
|---|---|---|
| 12:00 AM MST | 9:00 PM HST | previous day |
| 1:00 AM MST | 10:00 PM HST | previous day |
| 2:00 AM MST | 11:00 PM HST | previous day |
| 3:00 AM MST | 12:00 AM HST | night |
| 4:00 AM MST | 1:00 AM HST | night |
| 5:00 AM MST | 2:00 AM HST | night |
| 6:00 AM MST | 3:00 AM HST | night |
| 7:00 AM MST | 4:00 AM HST | night |
| 8:00 AM MST | 5:00 AM HST | night |
| 9:00 AM MST | 6:00 AM HST | — |
| 10:00 AM MST | 7:00 AM HST | — |
| 11:00 AM MST | 8:00 AM HST | — |
| 12:00 PM MST | 9:00 AM HST | work hours |
| 1:00 PM MST | 10:00 AM HST | work hours |
| 2:00 PM MST | 11:00 AM HST | work hours |
| 3:00 PM MST | 12:00 PM HST | work hours |
| 4:00 PM MST | 1:00 PM HST | work hours |
| 5:00 PM MST | 2:00 PM HST | — |
| 6:00 PM MST | 3:00 PM HST | — |
| 7:00 PM MST | 4:00 PM HST | — |
| 8:00 PM MST | 5:00 PM HST | — |
| 9:00 PM MST | 6:00 PM HST | — |
| 10:00 PM MST | 7:00 PM HST | — |
| 11:00 PM MST | 8:00 PM HST | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert MST to HST
Subtract 3 hours from the MST time to get HST.
Example: 9:00 AM MST = 6:00 AM HST.
Across midnight: 1:00 AM MST = 10:00 PM HST (previous day). The date changes, so always check the day as well as the hour.
Time difference between MST and HST
The time difference between MST and HST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 31 Dec 2025 – 7 Mar 2026: HST is 3 hours behind of MST.
- 8 Mar 2026 – 31 Oct 2026: HST is 4 hours behind of MST.
- 1 Nov 2026 – 30 Dec 2026: HST is 3 hours behind of MST.
MST and HST during daylight saving time
- 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).
- HST does not observe daylight saving time; it stays on UTC−10 all year.
Best time for a meeting between MST and HST
MST and HST share 5 hours of the 9 AM–5 PM working day. Any time between 12:00 PM and 5:00 PM MST lands between 9:00 AM and 2:00 PM HST, inside working hours for both.
MST to HST FAQ
What is the time difference between MST and HST?
Right now HST is 3 hours behind MST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM MST in HST?
9:00 AM MST is 6:00 AM HST.
What is 12 PM (noon) MST in HST?
12:00 PM MST is 9:00 AM HST.
Is HST ahead of or behind MST?
HST is 3 hours behind MST, so it is earlier in HST than in MST.
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.
Does HST change for daylight saving time?
No. HST stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between MST and HST?
MST and HST share 5 hours of the 9 AM–5 PM working day. Any time between 12:00 PM and 5:00 PM MST lands between 9:00 AM and 2:00 PM HST, 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 HST to MST
Convert MST to other time zones
Convert other time zones to HST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.