Current Time in US/Hawaii Time Zone
IANA Name: US/Hawaii
Standard Offset: UTC −10:00
Daylight Saving: No
Currently Observing DST: No ❌
US/Hawaii Time Zone: A Complete Guide
The US/Hawaii time zone, also known as Hawaii Standard Time (HST), is a unique zone that covers the entire state of Hawaii, USA. Unlike most US time zones, it does not observe daylight saving time, making it a constant UTC-10:00 offset year-round. This article explores its coverage, offset, daylight saving behavior, key cities, and practical scheduling tips.
Overview and Coverage
The US/Hawaii time zone applies to the entire state of Hawaii, including all its islands such as Oahu, Maui, Kauai, and the Big Island. The zone is used by approximately 1.4 million residents and millions of tourists annually. The IANA time zone database includes US/Hawaii as a canonical zone, along with other zones at the same standard offset: America/Adak (Aleutian Islands, Alaska), Pacific/Honolulu (same as US/Hawaii), Pacific/Rarotonga (Cook Islands), and Pacific/Tahiti (French Polynesia). However, US/Hawaii is the primary zone for Hawaii.
Offset and Abbreviation
The standard offset is UTC-10:00, meaning Hawaii is 10 hours behind Coordinated Universal Time. The abbreviation is HST (Hawaii Standard Time). This offset is constant throughout the year because Hawaii does not observe daylight saving time. For comparison, when US mainland zones are on daylight saving (March to November), Hawaii is 5 or 6 hours behind Eastern Time (ET) and 2 or 3 hours behind Pacific Time (PT).
Daylight Saving Time: No Change
Hawaii has not observed daylight saving time since 1945. The state's tropical latitude means daylight hours vary little between seasons (approximately 13.5 hours in summer and 11 hours in winter), so DST provides minimal benefit. As a result, the time in Hawaii remains constant all year. This contrasts with most US states, which shift clocks twice a year. For example, when New York is on EDT (UTC-4), Hawaii is 6 hours behind; when New York is on EST (UTC-5), Hawaii is 5 hours behind.
Main Cities and Regions
The largest city in the US/Hawaii zone is Honolulu (on Oahu), with a population of about 350,000. Other major cities include Hilo and Kailua-Kona (Big Island), Kahului (Maui), and Lihue (Kauai). The entire state operates on HST, so there is no time difference between islands. The zone also includes the uninhabited Northwestern Hawaiian Islands (part of Papahānaumokuākea Marine National Monument), but these are not permanently populated.
Practical Guidance for Scheduling
When scheduling calls or meetings across time zones, consider the following overlaps: During US daylight saving time (second Sunday March to first Sunday November), Hawaii is 3 hours behind Pacific Time (PT) and 6 hours behind Eastern Time (ET). During standard time (November to March), Hawaii is 2 hours behind PT and 5 hours behind ET. For example, 9:00 AM HST = 12:00 PM PT (during DST) or 11:00 AM PT (standard). For international coordination, Hawaii is 20 hours behind Japan Standard Time (JST) and 10 hours behind Australian Eastern Standard Time (AEST). Use tools like world clocks to avoid confusion, especially since many other zones at UTC-10 (like Tahiti) also lack DST, but some (like America/Adak) do observe DST, creating a temporary offset difference.
Frequently Asked Questions
Does Hawaii observe daylight saving time?
No, Hawaii does not observe daylight saving time. The time remains at HST (UTC-10) all year. This is due to Hawaii's tropical latitude, where daylight hours vary little between seasons.
What is the time difference between Hawaii and New York?
When New York is on Eastern Daylight Time (EDT, UTC-4), Hawaii is 6 hours behind. When New York is on Eastern Standard Time (EST, UTC-5), Hawaii is 5 hours behind. For example, 12:00 PM HST = 6:00 PM EDT or 5:00 PM EST.
What other regions share the same time as Hawaii?
Other regions at UTC-10 include the Aleutian Islands (America/Adak, but they observe DST), the Cook Islands (Pacific/Rarotonga), and French Polynesia (Pacific/Tahiti). However, only Hawaii and Tahiti do not observe DST, so their offset is constant.
What is the abbreviation for Hawaii time?
The abbreviation is HST, which stands for Hawaii Standard Time. It is used year-round since there is no daylight saving time.
How do I convert Hawaii time to Pacific Time?
During Pacific Daylight Time (PDT, UTC-7), Hawaii is 3 hours behind. During Pacific Standard Time (PST, UTC-8), Hawaii is 2 hours behind. For example, 10:00 AM HST = 1:00 PM PDT or 12:00 PM PST.
Is US/Hawaii the same as Pacific/Honolulu?
Yes, US/Hawaii and Pacific/Honolulu are the same IANA time zone. Both refer to the same location and offset (UTC-10). US/Hawaii is a legacy link, while Pacific/Honolulu is the canonical name.