World Timezones

MST to HST Converter

Compare HST to MST instead
Mountain Time10:35 pmThu, Jun 4
Mountain TimeMDT
North America · UTC-6
10:35 pmThu, Jun 4
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
Hawaii TimeHST
North America · UTC-10
6:35 pmThu, Jun 4
8p
9p
10p
11p
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p

Offset

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

4 hours

Mountain Time (MDT) is ahead of Hawaii Time (HST).

MDT: UTC-6

HST: UTC-10

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

When to schedule

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

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

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

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

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

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

Quick reference

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

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

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

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

Cities in these zones

Cities in Mountain Time

Cities in Hawaii Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Mountain Time

  • BJC
  • DEN
  • OGD
  • SLC

Airports in Hawaii Time

  • HNL

Related conversions

Common conversions

What is 9:00 am MST in HST?
9:00 am MST is 5:00 am HST.
What is 12:00 pm MST in HST?
12:00 pm MST is 8:00 am HST.
What is 12:30 pm MST in HST?
12:30 pm MST is 8:30 am HST.
What is 2:00 pm MST in HST?
2:00 pm MST is 10:00 am HST.
What is 5:00 pm MST in HST?
5:00 pm MST is 1:00 pm HST.
What is 11:30 pm MST in HST?
11:30 pm MST is 7:30 pm HST.