Hawaii Time (Honolulu)

Hawaii-Aleutian Standard Time (HST) covers the state of Hawaii and the western Aleutian Islands of Alaska. HST is permanently UTC-10 — Hawaii does not observe daylight saving time, a decision rooted in its tropical latitude where day length varies little throughout the year. This means Hawaii is 5 hours behind Eastern Time in winter but 6 hours behind in summer when the mainland springs forward. The consistent offset simplifies scheduling for Hawaii's massive tourism industry but creates challenges for business communication with the mainland. Hawaii's position as the westernmost US state makes it the last to see each day begin, earning it the phrase 'Hawaiian time' in popular culture. The timezone is critically important for the US military's Pacific Command (INDOPACOM) headquartered at Camp H.M. Smith, as well as for astronomical observatories on Mauna Kea. Hawaii's timezone position between the US mainland and Asia-Pacific makes it a strategic communications bridge. The Aleutian Islands technically use HAST/HADT but in practice, the few residents there often reference Anchorage time for convenience.