Hawaii-Aleutian Standard Time (HST) is the westernmost time zone in the United States, covering the state of Hawaii and the Aleutian Islands of Alaska.HST is the abbreviation of Hawaii-Aleutian Standard Time.
It operates at UTC−10 year-round in Hawaii. Unlike most of North America, Hawaii does not observe Daylight Saving Time.
📍 Key Highlights
- Used throughout the entire state of Hawaii.
- Covers the Aleutian Islands west of 169° 30′ W.
- Hawaii is one of only two US states (with Arizona) that do not change clocks.
- Aleutian Islands observe HDT (UTC-9) during summer, while Hawaii stays on HST.
🏝️ Why HST Matters
HST is critical for Pacific logistics and the tourism industry. Because Hawaii does not observe Daylight Saving Time, the time difference between Honolulu and the US mainland changes twice a year, making it vital for travelers and businesses to verify current offsets.
❓ Frequently Asked Questions
1. What does HST stand for and what is its UTC offset?
HST stands for Hawaii-Aleutian Standard Time. It is 10 hours behind Coordinated Universal Time (UTC-10).
2. Does Hawaii use Daylight Saving Time?
No. Hawaii remains on HST (UTC-10) all year long. The Aleutian Islands, however, do shift to HDT (UTC-9) in the summer.
3. What major cities are in the HST zone?
Major cities include Honolulu, Hilo, and Kahului in Hawaii, and Adak in the Aleutian Islands.
4. How far behind Eastern Time is Hawaii?
During the winter, HST is 5 hours behind EST. During the summer, it is 6 hours behind EDT.
5. Is all of Alaska in HST?
No. Most of Alaska uses Alaska Time (AKT). Only the far western Aleutian Islands use Hawaii-Aleutian Time.
6. What time is it in Hawaii right now?
It is currently –:–:– in Hawaii.
Our clocks are synchronized in real-time to ensure you always have the most accurate information.