Hawaii Time to US Mountain Time
Convert times between Hawaii Time (HST, UTC-10:00) and US Mountain Time (MST, UTC-7:00). US Mountain Time is 3 hours ahead of Hawaii Time in standard time. During daylight saving time this difference changes to 4 hours.
UTC-10:00→UTC-7:00 / -6:00
Live timezone converterUTC Offset Reference
| Timezone | Abbreviation | Standard offset | DST offset | Country |
|---|---|---|---|---|
| Hawaii Time | HST | UTC-10:00 | — | United States |
| US Mountain Time | MST / MDT | UTC-7:00 | UTC-6:00 | United States |
* DST offset applies during summer months. Exact transition dates vary by year.
Standard Time Conversion (HST → MST)
| Hawaii Time | US Mountain Time |
|---|---|
| 12:00 AM HST | 3:00 AM MST |
| 6:00 AM HST | 9:00 AM MST |
| 9:00 AM HST | 12:00 PM MST |
| 12:00 PM HST | 3:00 PM MST |
| 3:00 PM HST | 6:00 PM MST |
| 6:00 PM HST | 9:00 PM MST |
| 9:00 PM HST | 12:00 AM (next day) MST |
Summer (DST) Conversion (HST → MDT)
| Hawaii Time (summer) | US Mountain Time (summer) |
|---|---|
| 12:00 AM HST | 4:00 AM MDT |
| 6:00 AM HST | 10:00 AM MDT |
| 9:00 AM HST | 1:00 PM MDT |
| 12:00 PM HST | 4:00 PM MDT |
| 3:00 PM HST | 7:00 PM MDT |
| 6:00 PM HST | 10:00 PM MDT |
| 9:00 PM HST | 1:00 AM (next day) MDT |
Daylight Saving Time (DST) Notes
- US Mountain Time observes DST. Clocks advance 1 hour to MDT (UTC-6:00) roughly from month 3 to 11.
- The offset difference shifts between 3h (standard) and 4h (DST season). Always verify the current offset using the live converter below.
Frequently Asked Questions
How do I convert HST to MST?
Add 3 hours to the HST time to get MST. For example, 9:00 AM HST = 12:00 PM MST.
What is the current UTC offset for Hawaii Time?
Hawaii Time is always UTC-10:00 (HST) — it does not observe DST.
Is US Mountain Time ahead or behind Hawaii Time?
US Mountain Time is 3 hours ahead of Hawaii Time in standard time.
When is a good time to schedule a meeting between HST and MST?
A good overlap window is around 9:00 AM HST / 12:00 PM MST, which falls within business hours for both timezones.
Related Timezone Conversions
Hawaii Time → US Eastern TimeHST / ESTHawaii Time → US Central TimeHST / CSTHawaii Time → US Pacific TimeHST / PSTHawaii Time → US Alaska TimeHST / AKSTHawaii Time → Canada Atlantic TimeHST / ASTHawaii Time → Greenwich Mean TimeHST / GMTHawaii Time → India Standard TimeHST / ISTHawaii Time → China Standard TimeHST / CST
Need the exact current time?
Use the live ToolsHub timezone converter to see current times, DST status, and schedule across time zones.