Hawaii Standard Time (HST) · UTC-10 · Year-round · No Daylight Saving Time
Hawaii (HST, UTC-10) never changes. The time difference with the mainland shifts twice a year when the mainland observes DST.
| Mainland Zone | Winter (Standard Time) | Summer (Daylight Time) |
|---|---|---|
| Eastern (ET) | 5 hrs ahead of Hawaii | 6 hrs ahead of Hawaii |
| Central (CT) | 4 hrs ahead of Hawaii | 5 hrs ahead of Hawaii |
| Mountain (MT) | 3 hrs ahead of Hawaii | 4 hrs ahead of Hawaii |
| Pacific (PT) | 2 hrs ahead of Hawaii | 3 hrs ahead of Hawaii |
| Alaska (AKT) | 1 hrs ahead of Hawaii | 2 hrs ahead of Hawaii |
Example: When it is 12:00 PM HST in Honolulu, it is 5:00 PM EST (6:00 PM EDT) in New York.
Hawaii opted out of Daylight Saving Time under the Uniform Time Act of 1966. The state is close to the equator (latitude ~20°N), which means daylight hours vary little between summer and winter — making DST largely pointless.
Hawaii and Arizona are the only two states that do not observe DST. Hawaii uses HST (UTC-10) all year, every year. The clock in Honolulu never moves.
Because Hawaii is so far west of the mainland, adding evening daylight hours in summer would push sunset past 8:30 PM — which residents and businesses did not want. The current year-round HST keeps sunset at a reasonable 7:20–7:40 PM in summer.