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DateAlmanac

What is MST in HST?

Hawaii Standard Time is 3 hours behind

Mountain Time is on UTC−7:00 and Hawaii Standard Time is on UTC−10:00 right now. The gap changes during the year — see below.

Convert a time

HST — Hawaii Standard Time

10:00 pm

HST, Fri, the previous day

Time in Denver
1:29:57 AM
Time in Honolulu
10:29:57 PM
Difference
−3 h
Next clock change
March 14, 2027

When the difference changes

Mountain Time and Hawaii Standard Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:

  1. Now – March 14, 2027Hawaii Standard Time is 3 hours behind
  2. March 14, 2027 – November 7, 2027Hawaii Standard Time is 4 hours behind
  3. November 7, 2027 – onwardsHawaii Standard Time is 3 hours behind

Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.

Daylight saving

Mountain Time

Sunday, March 14, 2027

Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on MDT after that.

Hawaii Standard Time

No clock changes

Hawaii Standard Time stays on HST all year, so its offset from UTC never moves.

MST to HST conversion table

Every hour of Saturday, November 7, 2026, converted from Mountain Time to Hawaii Standard Time. 3 of the 24 hours fall on a different calendar day in Honolulu, which is marked.

12:00 am MST
9:00 pm HST−1 day
1:00 am MST
10:00 pm HST−1 day
2:00 am MST
11:00 pm HST−1 day
3:00 am MST
12:00 am HST
4:00 am MST
1:00 am HST
5:00 am MST
2:00 am HST
6:00 am MST
3:00 am HST
7:00 am MST
4:00 am HST
8:00 am MST
5:00 am HST
9:00 am MST
6:00 am HST
10:00 am MST
7:00 am HST
11:00 am MST
8:00 am HST
12:00 pm MST
9:00 am HST
1:00 pm MST
10:00 am HST
2:00 pm MST
11:00 am HST
3:00 pm MST
12:00 pm HST
4:00 pm MST
1:00 pm HST
5:00 pm MST
2:00 pm HST
6:00 pm MST
3:00 pm HST
7:00 pm MST
4:00 pm HST
8:00 pm MST
5:00 pm HST
9:00 pm MST
6:00 pm HST
10:00 pm MST
7:00 pm HST
11:00 pm MST
8:00 pm HST

Scheduling between the two

Working hours overlap from 12:00 pm to 6:00 pm MST, which is 9:00 am to 3:00 pm HST. Anything inside that window falls in the normal working day at both ends.

Mountain Time (MST) is used in Salt Lake City, Albuquerque and Calgary. Arizona keeps MST all year and does not follow MDT.

Hawaii Standard Time (HST) is used in all of Hawaii, which does not observe daylight saving

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