MST to HST Converter & Meeting Planner
Quick answer: 9:00 AM MST = 6:00 AM HST (fixed -07:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Mountain Standard Time (MST) and Hawaii-Aleutian Standard Time (HST)? You need to account for the standard time difference. Hawaii-Aleutian Standard Time is normally 3 hours behind Mountain Standard Time. Whether you are coordinating between teams in Denver and Phoenix and Honolulu and Hilo, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM MST = 9:00 PM HST. The full 24-hour MST to HST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM MST = 12:00 PM HST.
| MST Time | HST Time |
|---|---|
| 12:00 AM (00:00) | 9:00 PM (21:00)-1 day |
| 1:00 AM (01:00) | 10:00 PM (22:00)-1 day |
| 2:00 AM (02:00) | 11:00 PM (23:00)-1 day |
| 3:00 AM (03:00) | 12:00 AM (00:00) |
| 4:00 AM (04:00) | 1:00 AM (01:00) |
| 5:00 AM (05:00) | 2:00 AM (02:00) |
| 6:00 AM (06:00) | 3:00 AM (03:00) |
| 7:00 AM (07:00) | 4:00 AM (04:00) |
| 8:00 AM (08:00) | 5:00 AM (05:00) |
| 9:00 AM (09:00) | 6:00 AM (06:00) |
| 10:00 AM (10:00) | 7:00 AM (07:00) |
| 11:00 AM (11:00) | 8:00 AM (08:00) |
| 12:00 PM (12:00) | 9:00 AM (09:00) |
| 1:00 PM (13:00) | 10:00 AM (10:00) |
| 2:00 PM (14:00) | 11:00 AM (11:00) |
| 3:00 PM (15:00) | 12:00 PM (12:00) |
| 4:00 PM (16:00) | 1:00 PM (13:00) |
| 5:00 PM (17:00) | 2:00 PM (14:00) |
| 6:00 PM (18:00) | 3:00 PM (15:00) |
| 7:00 PM (19:00) | 4:00 PM (16:00) |
| 8:00 PM (20:00) | 5:00 PM (17:00) |
| 9:00 PM (21:00) | 6:00 PM (18:00) |
| 10:00 PM (22:00) | 7:00 PM (19:00) |
| 11:00 PM (23:00) | 8:00 PM (20:00) |
Best time to call Honolulu from Denver
For most work calls, compare the normal business day in Denver (MST) with the business day in Honolulu (HST). MST commonly covers North America, while HST is mainly associated with Pacific Ocean, North America.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 1:00 PM - 5:00 PM MST, which corresponds to 9:00 AM - 1:00 PM HST. This window sits inside the typical MST workday (9:00 AM - 5:00 PM) and the HST workday (9:00 AM - 5:00 PM).
- DST Safety: MST or HST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
🔥 Popular MST & HST Converters
Frequently searched time zone conversions related to your search.
Related Time Converters
Explore nearby time zone offsets and reverse conversions related to MST and HST.
Frequently Asked Questions
What is the time difference between MST and HST?
During standard time, Hawaii-Aleutian Standard Time is 3 hours behind Mountain Standard Time.
Does Arizona observe Daylight Saving Time?
Most of Arizona — including Phoenix, Tucson, and the state government — does not observe Daylight Saving Time, remaining on MST (UTC-7) year-round under a state law in effect since 1968. The significant exception is the Navajo Nation, which spans parts of northeastern Arizona, Utah, and New Mexico and does observe DST, creating one of the most complex intrastate time zone situations in the United States.
What is the difference between MST and MDT?
MST (Mountain Standard Time) is the winter offset at UTC-7:00, observed from the first Sunday in November through the second Sunday in March. MDT (Mountain Daylight Time) is the summer offset at UTC-6:00, applied when most Mountain Time regions advance their clocks by one hour during Daylight Saving Time.
Does Hawaii observe Daylight Saving Time?
Hawaii does not observe Daylight Saving Time and has not done so since 1947, remaining fixed at UTC-10:00 year-round. At roughly 20° North latitude, Hawaii's daylight hours vary by only about 1.5 hours between the summer and winter solstices — far too little to justify the disruption of a seasonal clock change.
Why is it called Hawaii-Aleutian time?
The name combines two geographically distant US territories that share the same UTC-10:00 standard offset: the Hawaiian Islands in the central Pacific and the westernmost Aleutian Islands of Alaska, which extend past the 180° meridian into the Eastern Hemisphere. Despite sharing a base offset, they behave differently — Hawaii observes no DST, while the Aleutian communities such as Adak do advance to HDT (UTC-9) each summer.