US Mountain Time to Hawaii Time
Convert times between US Mountain Time (MST, UTC-7:00) and Hawaii Time (HST, UTC-10:00). Hawaii Time is 3 hours behind US Mountain Time in standard time. During daylight saving time this difference changes to 4 hours.
UTC-7:00 / -6:00→UTC-10:00
Live timezone converterUTC Offset Reference
| Timezone | Abbreviation | Standard offset | DST offset | Country |
|---|---|---|---|---|
| US Mountain Time | MST / MDT | UTC-7:00 | UTC-6:00 | United States |
| Hawaii Time | HST | UTC-10:00 | — | United States |
* DST offset applies during summer months. Exact transition dates vary by year.
Standard Time Conversion (MST → HST)
| US Mountain Time | Hawaii Time |
|---|---|
| 12:00 AM MST | 9:00 PM (prev day) HST |
| 6:00 AM MST | 3:00 AM HST |
| 9:00 AM MST | 6:00 AM HST |
| 12:00 PM MST | 9:00 AM HST |
| 3:00 PM MST | 12:00 PM HST |
| 6:00 PM MST | 3:00 PM HST |
| 9:00 PM MST | 6:00 PM HST |
Summer (DST) Conversion (MDT → HST)
| US Mountain Time (summer) | Hawaii Time (summer) |
|---|---|
| 12:00 AM MDT | 8:00 PM (prev day) HST |
| 6:00 AM MDT | 2:00 AM HST |
| 9:00 AM MDT | 5:00 AM HST |
| 12:00 PM MDT | 8:00 AM HST |
| 3:00 PM MDT | 11:00 AM HST |
| 6:00 PM MDT | 2:00 PM HST |
| 9:00 PM MDT | 5:00 PM HST |
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 MST to HST?
Add (-3) hours to the MST time to get HST. For example, 9:00 AM MST = 6:00 AM HST.
What is the current UTC offset for US Mountain Time?
US Mountain Time is UTC-7:00 during standard time (MST) and UTC-6:00 during summer daylight saving time (MDT).
Is Hawaii Time ahead or behind US Mountain Time?
Hawaii Time is 3 hours behind US Mountain Time in standard time.
When is a good time to schedule a meeting between MST and HST?
A good overlap window is around 12:00 PM MST / 9:00 AM HST, which falls within business hours for both timezones.
Related Timezone Conversions
US Mountain Time → US Eastern TimeMST / ESTUS Mountain Time → US Central TimeMST / CSTUS Mountain Time → US Pacific TimeMST / PSTUS Mountain Time → US Alaska TimeMST / AKSTUS Mountain Time → Canada Atlantic TimeMST / ASTUS Mountain Time → Greenwich Mean TimeMST / GMTUS Mountain Time → India Standard TimeMST / ISTUS Mountain Time → China Standard TimeMST / CST
Need the exact current time?
Use the live ToolsHub timezone converter to see current times, DST status, and schedule across time zones.