MST to HST: MST is 4 hours ahead of HST

Mountain Time is 4 hours ahead of Hawaii Standard Time right now. It is 12:18 am MDT in Mountain and 8:18 pm HST in Hawaii, which is already the previous day there.

Convert a specific time from MST to HST

Pick any time and date to convert it both ways. The conversion runs in your browser against the real zone rules, so a date inside a daylight saving period gets that period's offset rather than today's.

What is the time difference between MST and HST?

Hawaii Standard Time is 4 hours behind Mountain Time. To go from MST to HST you subtract 4 hours. That gap is not fixed. Across 2026 the distance between these two zones takes 2 different values, from 3 hours to 4 hours, because Mountain moves its clocks and Hawaii does not. This page recomputes it rather than assuming.

MST to HST conversion table

Every hour of Friday, September 25, 2026 in Mountain, with the matching reading in Hawaii. 4 of the 24 hours land on a different calendar date in Hawaii, which is the part people get wrong when they schedule across this pair.

What are the best hours to schedule a call between MST and HST?

4 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 1:00 pm MST to 5:00 pm MST. In Hawaii that window reads 9:00 am to 1:00 pm. Outside it, one side is either not yet at their desk or already gone.

Does daylight saving change MST to HST?

Mountain Time is currently on MDT and changes next on Sunday, November 1, 2026, when the clock falls back from 1:59 am to 1:00 am and the offset moves from UTC-6 to UTC-7.

Hawaii Standard Time does not move its clocks at all, so its UTC-10 offset holds every day of the year.

Because the two sides do not move together, the answer to this conversion changes during the year. For part of the year the gap is 3 hours and for the rest it is 4 hours. The table above is built for today, not for an average day.

Is MST ahead of or behind HST?

MST is ahead of HST by 4 hours: when it is 12:00 pm in Mountain, it is 8:00 am in Hawaii. One wrinkle worth knowing: MST and MDT are two names for the same zone, not two zones. Mountain Time reads MST in winter and MDT in summer. When somebody types "mst to hst" they nearly always mean the zone rather than the literal winter offset, so this page resolves MST to America/Denver and HST to Pacific/Honolulu and applies whichever offset is genuinely in force on the day.

Mountain Time covers Denver, Salt Lake City, Albuquerque and Calgary. Hawaii Standard Time covers Hawaii, which has never moved its clocks. The identifiers behind them are America/Denver and Pacific/Honolulu, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.

Questions

What is MST in HST?

MST is 4 hours ahead of HST. 9:00 am MST is 5:00 am HST.

How many hours ahead is HST of MST?

HST is 4 hours behind MST. That varies across the year, between 3 hours and 4 hours.

What time is it in Hawaii right now?

8:18 pm HST on Thursday, September 24, 2026.

When can Mountain and Hawaii meet during working hours?

Between 1:00 pm and 5:00 pm MST, which is 9:00 am to 1:00 pm HST.

Does this account for daylight saving?

Yes. Every reading is computed from the IANA database for the actual date, so MDT and HST are the abbreviations genuinely in force today rather than a fixed assumption.

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