Honolulu sits in the Hawaii-Aleutian Standard Time zone, operating strictly on UTC-10 year-round. Unlike most of the United States, Hawaii doesn't observe Daylight Saving Time, which shifts the island's time offset relative to the mainland twice a year.
Planning a trip or scheduling a meeting across oceans requires knowing exact offsets. During winter months, when the US mainland observes Standard Time, Honolulu is two hours behind Pacific Standard Time and five hours behind Eastern Standard Time. When Daylight Saving Time begins in March, those gaps widen by an hour, placing Honolulu three hours behind Pacific Daylight Time and six hours behind Eastern Daylight Time.
Understanding Hawaii Standard Time
The official time zone for Honolulu and the rest of the Hawaiian archipelago is Hawaii Standard Time, abbreviated as HST. The region maintains a fixed offset of 10 hours behind Coordinated Universal Time.
Territorial timekeeping underwent several shifts before settling into this pattern. The Kingdom of Hawaii originally utilized a local mean time based on Honolulu's longitude. In 1896, the government formally adopted a standard meridian based on 157.5 degrees west, placing the islands exactly 10 hours and 30 minutes behind Greenwich Mean Time. Following annexation, the United States adjusted the official offset to a neat 10 hours behind UTC in 1900, aligning it with the tenth time zone west of Greenwich. As discussed in detailed articles by Lonely Planet, the results are widespread.
- Time Zone Name: Hawaii-Aleutian Standard Time (HST)
- UTC Offset: UTC-10
- Daylight Saving Time (DST): Not observed
- Primary Cities: Honolulu, Hilo, Kailua, Kahului
Why Hawaii Doesn't Observe Daylight Saving Time
Most states advance clocks by one hour each spring to extend evening daylight, but Hawaii abandoned this practice decades ago. Geographic location makes the shift unnecessary. Positioned just 21 degrees north of the equator, the Hawaiian islands experience very little variation in daylight length between summer and winter.
The sun rises around 5:45 AM and sets near 7:00 PM during midsummer, while winter daylight shifts to roughly 7:00 AM sunrises and 6:00 PM sunsets. Because tropical daylight remains consistent year-round, local lawmakers and residents found little benefit in disrupting sleep schedules and commercial operations twice a year.
Voters and legislators formally rejected Daylight Saving Time through a state law enacted in 1967, after a trial period showed minimal energy savings and widespread logistical confusion for local agriculture and tourism. According to the National Institute of Standards and Technology, only Hawaii and Arizona (excluding the Navajo Nation) maintain permanent standard time within the United States.
Calculating the Time Difference Across Regions
Coordinating calls or travel itineraries between Honolulu and other major global hubs requires tracking how mainland shifts impact the gap. Because the mainland springs forward while Hawaii stays put, the math changes twice a year.
Pacific Time Zone
- Winter (November to March): Honolulu is 2 hours behind Pacific Standard Time. When it's 10:00 AM PST in Los Angeles, it's 8:00 AM HST in Honolulu.
- Summer (March to November): Honolulu is 3 hours behind Pacific Daylight Time. When it's 10:00 AM PDT in Los Angeles, it's 7:00 AM HST in Honolulu.
Eastern Time Zone
- Winter (November to March): Honolulu is 5 hours behind Eastern Standard Time. When it's 1:00 PM EST in New York, it's 8:00 AM HST in Honolulu.
- Summer (March to November): Honolulu is 6 hours behind Eastern Daylight Time. When it's 1:00 PM EDT in New York, it's 7:00 AM HST in Honolulu.
International Hubs (Tokyo, Sydney, London)
- Tokyo, Japan (UTC+9): Honolulu is 19 hours behind Tokyo. Because Tokyo sits across the International Date Line, Honolulu time is technically one calendar day behind Tokyo.
- London, United Kingdom: During British Summer Time (UTC+1), Honolulu is 11 hours behind London. During UK winter (UTC+0), the gap is 10 hours.
Common Scheduling Mistakes to Avoid
Miscalculating the time change leads to missed flights, late video calls, and booking errors. Several recurring mistakes trip up travelers and remote workers connecting with the islands.
- Assuming the mainland time gap stays constant: Forgetting that the time difference increases by one hour in the spring results in showing up an hour early or late for remote meetings.
- Ignoring flight arrival dates: Transpacific flights crossing multiple time zones often land on the same calendar day they departed, but the local time feels jarringly different due to the 10-hour offset.
- Mismanaging automated calendar invites: Scheduling tools like Google Calendar automatically adjust for time zones, but manual entry across different regions frequently causes confusion. Always verify meeting times using explicit city references rather than raw offsets.
- Confusing HST with AKST: The Hawaii-Aleutian time zone also covers parts of Alaska, but Alaska observes Daylight Saving Time while Hawaii does not, meaning Alaska and Hawaii share the same time only during the winter months.
Frequently Asked Questions
Does all of Hawaii share the same time zone?
Yes. The entire state of Hawaii, from Niihau in the west to the Big Island in the east, operates on Hawaii Standard Time year-round. There are no internal time zone boundaries within the state.
What time is it in Honolulu right now compared to UTC?
Honolulu is always exactly 10 hours behind Coordinated Universal Time. If UTC is 18:00 (6:00 PM), it is 8:00 AM in Honolulu.
Do flights from the US mainland to Honolulu cross the International Date Line?
No. Flights departing from the US mainland fly west across the Pacific Ocean within the same calendar day, meaning passengers don't cross the International Date Line.
Why is it called the Hawaii-Aleutian Time Zone?
The time zone name groups the Hawaiian islands with the Aleutian Islands of Alaska. However, the Aleutian chain west of 169.30° west longitude observes Alaska Standard Time and participates in Daylight Saving Time, creating a distinct split within the official administrative zone name.
