As standard time (Northern Hemisphere winter)

• United States
  • Alaska
    Alaska
    Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...
    
     (except for Aleutian Islands) (AKST—Alaska Standard Time
    Alaska Time Zone
    The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time . During daylight saving time its time offset is only eight hours . The clock time in this zone is based on the mean solar time of the 135th meridian west of the Greenwich Observatory.The zone...
    
    )
  • The westernmost area of Alaska is very far outside the theoretical UTC-9 zone. Cape Prince of Wales
    Cape Prince of Wales
    Cape Prince of Wales is the westernmost point on the mainland of the Americas.Located on the Seward Peninsula of the U.S. state of Alaska near the city of Wales, Cape Prince of Wales is the terminus of the Continental Divide, marking the division between the Pacific and Arctic coasts, as well as...
    
     has longitude
    Longitude
    Longitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface. It is an angular measurement, usually expressed in degrees, minutes and seconds, and denoted by the Greek letter lambda ....
    
     168°05′W, that is mean solar time UTC-11:12. This is one of the largest differences in the world between standard time and mean solar time.

As daylight saving time (Northern Hemisphere summer)

• United States
  • Alaska - Aleutian Islands only (HADT—Hawaii-Aleutian Daylight Time
    Hawaii-Aleutian time zone
    The Hawaii-Aleutian Time Zone observes Hawaii-Aleutian Standard Time , by subtracting ten hours from Coordinated Universal Time . The clock time in this zone is based on the mean solar time of the 150th meridian west of the Greenwich Observatory....
    
    )