Honolulu to MST
+3hHonolulu
HSTSOURCEMST
MSTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and MST on the World Map
The map below highlights the HST (Hawaii Standard Time) and MST (Mountain Standard Time) timezone regions across the globe.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •Hawaii does not observe daylight saving time.
- •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
- •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
MST – Mountain Standard Time
UTC-07:00Mountain Standard Time (MST) is the time zone for the Mountain region of North America, 7 hours behind UTC.
- •Arizona does not observe daylight saving time, staying on MST year-round.
- •The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
- •Denver, the 'Mile High City', is the largest city fully in MST.
- •MST covers 6 US states entirely and parts of several others.
About Honolulu
WikipediaHonolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.
Pearl Harbor memorial receives over 2 million visitors annually.
Understanding the +3h Gap: Honolulu vs MST
Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. MST runs on Mountain Standard Time (MST) at UTC-07:00. That puts Honolulu 3 hours ahead of MST — a difference of +3h at the current offsets.
In practice, when it is 9:00 AM in Honolulu it is 12:00 PM in MST. Midnight in Honolulu is 3:00 AM in MST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Honolulu to MST time conversion table
| Honolulu (HST) | MST (MST) | Day |
|---|---|---|
| 12:00 AM | 3:00 AM | same day |
| 6:00 AM | 9:00 AM | same day |
| 7:00 AM | 10:00 AM | same day |
| 8:00 AM | 11:00 AM | same day |
| 9:00 AM | 12:00 PM | same day |
| 12:00 PM | 3:00 PM | same day |
| 3:00 PM | 6:00 PM | same day |
| 5:00 PM | 8:00 PM | same day |
| 6:00 PM | 9:00 PM | same day |
| 9:00 PM | 12:00 AM | next day |
Why people convert Honolulu to MST time
- Scheduling a call from Honolulu to MST: a 10:00 AM start in Honolulu lands at 1:00 PM in MST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Honolulu and MST are inside the 9-to-5 working day between 9:00 AM and 2:00 PM HST time (12:00 PM–5:00 PM MST). That is roughly 5 hours of usable overlap.
- Coordinating a Honolulu-based team with MST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" is unambiguous; "3 PM" across a +3h gap is not.
- Block 9:00 AM–2:00 PM HST as the recurring meeting window if you work primarily from Honolulu and need MST colleagues present.
About HST (Hawaii Standard Time)
Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.
About MST (Mountain Standard Time)
Mountain Standard Time (MST) covers the Rocky Mountain region of the United States and Canada. Arizona is notable for not observing daylight saving time, staying on MST year-round (except the Navajo Nation). The time zone includes major cities like Denver, Phoenix, Calgary, and Salt Lake City. During summer, most areas switch to Mountain Daylight Time (MDT, UTC-06:00).
Best time to call between Honolulu and MST
Both Honolulu and MST sit inside the 9 AM – 5 PM working day between 9:00 AM–2:00 PM HST, which is 12:00 PM–5:00 PM MST. That gives roughly 5 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Honolulu and MST share 5 hours of working-hours overlap (9:00 AM–2:00 PM HST), so scheduling a live meeting is straightforward.
Honolulu is 3 hours ahead of MST (HST UTC-10:00 → MST UTC-07:00). The shared working window is 9:00 AM–2:00 PM HST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Honolulu
Does not observe DST
MST
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between Honolulu and MST?
Honolulu (HST, UTC-10:00) is 3 hours ahead of MST (MST, UTC-07:00). The gap is currently +3h.
How do I convert Honolulu time to MST time?
Add +3h to Honolulu local time. For example, 9:00 AM in Honolulu is 12:00 PM in MST.
What time is it in MST right now?
MST uses MST at UTC-07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +3h offset from Honolulu.
What is the best time to call MST from Honolulu?
Call between 9:00 AM and 2:00 PM HST — that maps to 12:00 PM–5:00 PM MST and keeps both parties inside the working day.
Which is ahead, Honolulu or MST?
Honolulu is 3 hours ahead of MST. When it is 12:00 PM in Honolulu it is 3:00 PM in MST.
Do Honolulu and MST use different time zones?
Honolulu (USA) uses HST at UTC-10:00, while MST uses MST at UTC-07:00. The IANA identifiers are Pacific/Honolulu and America/Denver.
Does daylight saving time affect the Honolulu–MST difference?
Neither zone observes daylight saving time, so the +3h offset between Honolulu and MST is fixed all year.
Which other cities share Honolulu's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, Honolulu's zone?
HST is used in United States (Hawaii).
Is there a day difference between Honolulu and MST?
Not normally. The +3h gap only pushes the date over for late-evening times.
What is the time difference between Honolulu and MST?
MST is +3h from Honolulu.
What timezone is Honolulu in?
Honolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.
What timezone is MST in?
MST operates on its local timezone.
What are the business hours in Honolulu?
Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.
Which countries use HST (Hawaii Standard Time)?
HST is used in United States (Hawaii).
Does HST observe daylight saving time?
No, HST does not observe daylight saving time and remains at UTC-10:00 year-round.
What are some interesting facts about HST?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
Which cities are in the MST timezone?
Major cities in the MST timezone include Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson.
What is the UTC offset for MST?
Mountain Standard Time (MST) is at UTC-07:00. During daylight saving time, it shifts to MDT.
What should I know about the MST timezone?
Arizona does not observe daylight saving time, staying on MST year-round. The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
When is it midnight in Honolulu, what time is it in MST?
When it is 12:00 AM (midnight) in Honolulu (HST), it is +3h later in MST (MST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Honolulu time conversions
- honolulu to new york
- honolulu to los angeles
- honolulu to chicago
- honolulu to denver
- honolulu to anchorage
- honolulu to hst
- honolulu to auckland
- honolulu to london
- honolulu to dubai
- honolulu to tokyo
- honolulu to singapore
- honolulu to sydney
- honolulu to paris
- honolulu to delhi
- honolulu to mumbai
- honolulu to berlin
- honolulu to hong kong
- honolulu to toronto
- honolulu to kathmandu
- new york to honolulu
- london to honolulu
- dubai to honolulu
- tokyo to honolulu
- singapore to honolulu
- sydney to honolulu
- los angeles to honolulu
- paris to honolulu
- delhi to honolulu
- mumbai to honolulu
- berlin to honolulu
- hong kong to honolulu
- toronto to honolulu
- kathmandu to honolulu
See every conversion from Honolulu →·See every conversion from MST →