The region for HST is currently observing Daylight Saving Time. The current time zone is HDT.
Please see the correct page here: Current Time in HDT.
Current Time in HST (Hawaii-Aleutian Standard Time)
About HST
The standard time used in Hawaii and the portion of the Aleutian Islands that is west of -169.5° West longitude. Hawaii does not observe daylight saving time, remaining on HST year-round. The Aleutian Islands part does observe DST (HDT).
UTC Offset: -10:00
Current time shown is based on the representative IANA zone: America/Adak
Hawaii-Aleutian Standard Time (HAST)
Hawaii-Aleutian Standard Time (HAST) is a time zone observed in Hawaii and parts of the Aleutian Islands of Alaska. It is 10 hours behind Coordinated Universal Time (UTC-10:00). The abbreviation HAST stands for Hawaii-Aleutian Standard Time, reflecting its two primary regions. Unlike most U.S. time zones, HAST does not observe daylight saving time, except for the Aleutian Islands west of 169°30′W, which shift to Hawaii-Aleutian Daylight Time (HDT, UTC-9:00) during summer.
What Is Hawaii-Aleutian Standard Time?
Hawaii-Aleutian Standard Time (HAST) is the standard time used in the Hawaiian Islands and the westernmost Aleutian Islands of Alaska. The zone is designated as UTC-10:00, meaning it is ten hours behind Coordinated Universal Time. The abbreviation HAST distinguishes it from the daylight-saving variant, HDT, which applies only in the Aleutian portion that observes DST.
Standard Offset and Daylight Saving
The standard offset for HAST is UTC-10:00. Hawaii does not observe daylight saving time, so it remains on HAST year-round. However, the Aleutian Islands west of 169°30′W (including Adak and Atka) do observe DST, advancing to Hawaii-Aleutian Daylight Time (HDT, UTC-9:00) from the second Sunday in March to the first Sunday in November. This creates a seasonal split within the zone: Hawaii stays at UTC-10 while the Aleutian portion shifts to UTC-9.
Regions, Countries, and Cities
HAST covers the entire state of Hawaii (USA), including Honolulu, Hilo, Kailua-Kona, and Kahului. It also covers the Aleutian Islands west of 169°30′W in Alaska, primarily the city of Adak. Additionally, the zone includes Johnston Atoll (part of the United States Minor Outlying Islands), which is uninhabited. The IANA time zone identifiers under HAST include America/Adak, America/Atka, HST, Pacific/Honolulu, Pacific/Johnston, US/Aleutian, and US/Hawaii.
Differences from Neighboring Zones
HAST is one hour behind Alaska Standard Time (AKST, UTC-9:00) and one hour ahead of Samoa Standard Time (SST, UTC-11:00). During daylight saving time, the Aleutian portion aligns with AKDT (UTC-8:00), while Hawaii remains at UTC-10, creating a two-hour difference between Hawaii and Anchorage in summer. To the south, French Polynesia (Gambier Islands) uses UTC-9, while the Marquesas Islands use UTC-9:30, so no direct neighbor shares the same offset.
Practical Business Hours Guidance
When scheduling calls with Hawaii from the U.S. mainland, note that Hawaii is typically 2-3 hours behind Pacific Time (PT) depending on DST. For example, 9:00 AM PT is 6:00 AM HST in winter and 7:00 AM HST in summer (due to mainland DST). For the Aleutian Islands that observe DST, their local time matches AKDT in summer, so a 9:00 AM PT call is 7:00 AM in Adak during DST. Always confirm DST status for the specific location. Common business hours in Honolulu (8:00 AM to 5:00 PM HST) correspond to 1:00 PM to 10:00 PM Eastern Time (ET) in winter, and 2:00 PM to 11:00 PM ET in summer.
Key Facts About HAST
- Full name: Hawaii-Aleutian Standard Time
- UTC offset: UTC-10:00
- Daylight saving: Not observed in Hawaii; observed in Aleutian Islands west of 169°30′W (HDT, UTC-9:00)
- Major cities: Honolulu, Hilo, Kailua-Kona, Kahului, Adak
- IANA zones: America/Adak, America/Atka, HST, Pacific/Honolulu, Pacific/Johnston, US/Aleutian, US/Hawaii
Frequently Asked Questions
Does Hawaii observe daylight saving time?
No, Hawaii does not observe daylight saving time. It remains on Hawaii-Aleutian Standard Time (UTC-10) year-round. However, the Aleutian Islands of Alaska that use this zone do observe DST, shifting to HDT (UTC-9) in summer.
What is the time difference between Hawaii and New York?
Hawaii is 5 hours behind New York during Eastern Standard Time (EST, UTC-5) and 6 hours behind during Eastern Daylight Time (EDT, UTC-4). For example, noon in New York is 7:00 AM HST in winter and 6:00 AM HST in summer.
Is Johnston Atoll in the same time zone as Hawaii?
Yes, Johnston Atoll (part of the U.S. Minor Outlying Islands) uses Hawaii-Aleutian Standard Time (UTC-10) year-round. However, the atoll is uninhabited and does not observe DST.
Why is it called Hawaii-Aleutian Standard Time?
The name reflects the two main regions that use the zone: the Hawaiian Islands and the Aleutian Islands of Alaska. The abbreviation HAST distinguishes it from the daylight-saving variant HDT used in the Aleutian portion.
What is the current time in Adak, Alaska?
Adak, Alaska uses Hawaii-Aleutian Standard Time (UTC-10) in winter and Hawaii-Aleutian Daylight Time (UTC-9) in summer. To get the current time, check a world clock for America/Adak.
How many hours behind UTC is HAST?
Hawaii-Aleutian Standard Time is 10 hours behind Coordinated Universal Time (UTC-10). During daylight saving time in the Aleutian Islands, the offset becomes UTC-9 (HDT).