World Timezones

HST to MST Converter

Compare MST to HST instead
Hawaii Time6:35 pmThu, Jun 4
Hawaii TimeHST
North America · UTC-10
6:35 pmThu, Jun 4
12a
1a
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8a
9a
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11a
12p
1p
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6p
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8p
9p
10p
11p
Mountain TimeMDT
North America · UTC-6
10:35 pmThu, Jun 4
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
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8p
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12a
1a
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Offset

The time difference between Hawaii Time and Mountain Time is 4 hours.

4 hours

Hawaii Time (HST) is behind Mountain Time (MDT).

HST: UTC-10

MDT: UTC-6

Mountain Time is currently observing daylight saving time; Hawaii Time is not.

When to schedule

Business-hours overlap: 9 AM–1 PM in Hawaii Time (1 PM–5 PM in Mountain Time).

Both teams are in working hours during this window on weekdays.

Suggested time: 11:00 AM Hawaii Time (3:00 PM Mountain Time).

This window may shift by an hour during daylight saving time.

Public holidays in 2026

National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.

United States

  • New Year's DayThu, Jan 1
  • Martin Luther King, Jr. DayMon, Jan 19
  • Presidents DayMon, Feb 16
  • Memorial DayMon, May 25
  • Juneteenth National Independence DayFri, Jun 19
  • Independence DayFri, Jul 3
  • Labour DayMon, Sep 7
  • Columbus DayMon, Oct 12
  • Veterans DayWed, Nov 11
  • Thanksgiving DayThu, Nov 26
  • Christmas DayFri, Dec 25

About these zones

Hawaii Time is also known as HST. To call United States, dial +1.

Mountain Time is also known as MST, or MDT. To call United States, dial +1.

Mountain Time is approximately 3,350 miles northeast of Hawaii Time.

Quick reference

Full 24-hour conversion table — tap any time to open it in the converter.

HSTMSTDay
12:00 am4:00 amSame day
1:00 am5:00 amSame day
2:00 am6:00 amSame day
3:00 am7:00 amSame day
4:00 am8:00 amSame day
5:00 am9:00 amSame day
6:00 am10:00 amSame day
7:00 am11:00 amSame day
8:00 am12:00 pmSame day
9:00 am1:00 pmSame day
10:00 am2:00 pmSame day
11:00 am3:00 pmSame day
12:00 pm4:00 pmSame day
1:00 pm5:00 pmSame day
2:00 pm6:00 pmSame day
3:00 pm7:00 pmSame day
4:00 pm8:00 pmSame day
5:00 pm9:00 pmSame day
6:00 pm10:00 pmSame day
7:00 pm11:00 pmSame day
8:00 pm12:00 am+1 day
9:00 pm1:00 am+1 day
10:00 pm2:00 am+1 day
11:00 pm3:00 am+1 day

Daylight saving time

Mountain Time observes daylight saving time; Hawaii Time does not. The offset between the two zones changes when Mountain Time transitions: on Sunday, November 1, 2026, clocks fall back from MDT to MST.

See the daylight saving time page for transition dates across every time zone.

Daylight today

Hawaii Time
Sunrise
5:50 AM
Sunset
7:12 PM
Day length
13h 22m
Mountain Time
Sunrise
5:34 AM
Sunset
8:25 PM
Day length
14h 51m

Daylight overlap: 10h 35m — 5:50 AM–4:25 PM in Hawaii Time (9:50 AM–8:25 PM in Mountain Time). Both locations are in daylight during this window.

Cities in these zones

Cities in Hawaii Time

Cities in Mountain Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Hawaii Time

  • HNL

Airports in Mountain Time

  • BJC
  • DEN
  • OGD
  • SLC

Related conversions

Common conversions

What is 9:00 am HST in MST?
9:00 am HST is 1:00 pm MST.
What is 12:00 pm HST in MST?
12:00 pm HST is 4:00 pm MST.
What is 12:30 pm HST in MST?
12:30 pm HST is 4:30 pm MST.
What is 2:00 pm HST in MST?
2:00 pm HST is 6:00 pm MST.
What is 5:00 pm HST in MST?
5:00 pm HST is 9:00 pm MST.
What is 11:30 pm HST in MST?
11:30 pm HST is 3:30 am MST, the next day.