Hawaii operates on Hawaii-Aleutian Standard Time (HST) year-round, which is 10 hours behind Coordinated Universal Time (UTC-10). Hawaii does not observe daylight saving time, maintaining the same UTC offset throughout the year.
All of Hawaii follows the same time zone. Major cities including Honolulu, Pearl City, Hilo, Kailua, and Waipahu all observe Hawaii-Aleutian Standard Time. Hawaii is one of only two US states that doesn't observe daylight saving time.
Hawaii has the westernmost timezone in the United States. When it's 9 AM in Honolulu, it's noon in Los Angeles, 3 PM in New York, and 8 PM in London. Hawaii's early timezone makes it ideal for starting the trading day ahead of mainland markets.