HST to Denver
+4hHST
HSTSOURCEDenver
MDTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and MDT on the World Map
The map below highlights the HST (Hawaii Standard Time) and MDT (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 Denver
WikipediaDenver operates on Mountain Time (MST/MDT), 2 hours behind New York. As a tech and aerospace hub, Denver bridges West Coast and Central US business hours.
Denver International Airport is the largest airport in North America by land area.
HST to Denver Time Difference – Complete Guide
HST runs on Hawaii Standard Time (HST) at UTC-10:00. Denver runs on Mountain Daylight Time (MDT) at UTC-06:00, also currently on daylight saving time. That puts HST 4 hours ahead of Denver — a difference of +4h at the current offsets.
In practice, when it is 9:00 AM in HST it is 1:00 PM in Denver. Midnight in HST is 4:00 AM in Denver.Denver observes daylight saving time while HST does not, so the gap narrows or widens by an hour part of the year.
HST to Denver time conversion table
| HST (HST) | Denver (MDT) | Day |
|---|---|---|
| 12:00 AM | 4:00 AM | same day |
| 6:00 AM | 10:00 AM | same day |
| 7:00 AM | 11:00 AM | same day |
| 8:00 AM | 12:00 PM | same day |
| 9:00 AM | 1:00 PM | same day |
| 12:00 PM | 4:00 PM | same day |
| 3:00 PM | 7:00 PM | same day |
| 5:00 PM | 9:00 PM | same day |
| 6:00 PM | 10:00 PM | same day |
| 9:00 PM | 1:00 AM | next day |
Why people convert HST to Denver time
- Scheduling a call from HST to Denver: a 10:00 AM start in HST lands at 2:00 PM in Denver, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both HST and Denver are inside the 9-to-5 working day between 9:00 AM and 1:00 PM HST time (1:00 PM–5:00 PM MDT). That is roughly 4 hours of usable overlap.
- Watching a live event or market open: HST viewers need 1:00 PM in Denver to catch a 9:00 AM start there, and 8:00 PM if the event is anchored to HST.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" is unambiguous; "3 PM" across a +4h gap is not.
- Block 9:00 AM–1:00 PM HST as the recurring meeting window if you work primarily from HST and need Denver colleagues present.
- Denver: Clocks fall back on Sun, Nov 1, 2026. Any meeting series spanning that date will shift by an hour in local time.
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 HST and Denver
Both HST and Denver sit inside the 9 AM – 5 PM working day between 9:00 AM–1:00 PM HST, which is 1:00 PM–5:00 PM MDT. That gives roughly 4 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
HST and Denver overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
HST is 4 hours ahead of Denver (HST UTC-10:00 → MDT UTC-06:00). The shared working window is 9:00 AM–1:00 PM HST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
HST
Does not observe DST
Denver
☀ 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 HST and Denver?
HST (HST, UTC-10:00) is 4 hours ahead of Denver (MDT, UTC-06:00). The gap is currently +4h.
How do I convert HST time to Denver time?
Add +4h to HST local time. For example, 9:00 AM in HST is 1:00 PM in Denver.
What time is it in Denver right now?
Denver uses MDT at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +4h offset from HST.
What is the best time to call Denver from HST?
Call between 9:00 AM and 1:00 PM HST — that maps to 1:00 PM–5:00 PM MDT and keeps both parties inside the working day.
Which is ahead, HST or Denver?
HST is 4 hours ahead of Denver. When it is 12:00 PM in HST it is 4:00 PM in Denver.
Do HST and Denver use different time zones?
HST uses HST at UTC-10:00, while Denver (USA) uses MDT at UTC-06:00. The IANA identifiers are Pacific/Honolulu and America/Denver.
Does daylight saving time affect the HST–Denver difference?
Yes at the moment: Denver is on daylight saving time and HST is not, so the +4h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share HST's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, HST's zone?
HST is used in United States (Hawaii).
Is there a day difference between HST and Denver?
Not normally. The +4h gap only pushes the date over for late-evening times.
What is the time difference between HST and Denver?
Denver is +4h from HST.
What timezone is HST in?
HST operates on its local timezone.
What timezone is Denver in?
Denver operates on Mountain Time (MST/MDT), 2 hours behind New York. As a tech and aerospace hub, Denver bridges West Coast and Central US business hours.
What are the business hours in Denver?
Standard business hours in Denver are 8:00 AM - 5:00 PM MST.
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 HST, what time is it in Denver?
When it is 12:00 AM (midnight) in HST (HST), it is +4h later in Denver (MST).
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