Alaska-Hawaii Time, also known as Hawaii-Aleutian Standard Time, is a time zone used in Alaska and Hawaii. It is four hours behind Eastern Time. Some synonyms for Alaska-Hawaii Time include UTC-10:00, Pacific/Honolulu time, and HST. HST stands for Hawaii Standard Time, which is used interchangeably with Alaska-Hawaii Time. This time zone is used by the state of Hawaii, including the islands of Maui, Oahu, Kauai, and the Big Island, as well as the Aleutian Islands of Alaska. Tourists planning trips to Hawaii or Alaska must take this time zone into consideration while scheduling their itineraries and flights.