Definition of Hawaii-Aleutian Standard Time in US English:

Hawaii-Aleutian Standard Time

(also HST)


  • 1The standard time in a zone including the Hawaiian Islands and the western Aleutian Islands.

    • ‘Time in the United States is currently split into 9 time zones; Atlantic Standard Time, Eastern Standard Time, Central Standard Time, Mountain Standard Time, Pacific Standard Time, Alaska Standard Time, Hawaii-Aleutian Standard Time, Samoa Standard Time, and Chamorro Standard Time.’
    • ‘The westernmost Aleutian Islands are on the Hawaii-Aleutian Standard Time, two hours behind Pacific Standard Time.’
    • ‘Seattle time is 2 hours ahead of Hawaii time (Hawaii-Aleutian Standard Time), 1 hour ahead of Alaska time (Alaska Standard Time), and 3 hours behind New York (Atlantic Standard Time).’
    1. 1.1 Standard time based on the mean solar time at longitude 150° W., ten hours behind GMT. Also called Hawaiian Standard Time.