What Time Is It in Hawaii: Your Guide to Island Time

Hawaii operates on Hawaii Standard Time (HST), which is fixed at UTC-10 year-round and never observes Daylight Saving Time. To find what time it is in Hawaii right now, subtract 3 hours from Pacific Daylight Time (PDT) or 6 hours from Eastern Daylight Time (EDT).

Because the state of Hawaii stays on standard time while the majority of the United States toggles back and forth each spring and autumn, the time difference between Hawaii and the mainland changes twice a year. Understanding this fixed offset is essential whether you are planning a vacation, scheduling cross-country business calls, or tracking flight schedules across the Pacific Ocean.

Understanding Hawaii Standard Time (HST)

Hawaii Standard Time is the official time zone for all eight main Hawaiian islands: Oahu, Maui, Hawaii (the Big Island), Kauai, Molokai, Lanai, Niihau, and Kahoolawe. Its standard technical designation is UTC-10, meaning local time in Hawaii is exactly 10 hours behind Coordinated Universal Time (UTC).

The defining feature of HST is its permanence. Unlike most U.S. states, Hawaii does not observe Daylight Saving Time (DST). The clock hands in Honolulu, Lahaina, or Hilo never move forward in March or back in November. While the clock on your wall or phone on the mainland changes, Hawaii remains strictly anchored at UTC-10.

This stability simplifies life locally, but it creates shifting relative offsets for people outside the state. When North America shifts to Daylight Saving Time during the warmer months, the time gap between mainland cities and Hawaii widens by one hour. When North America reverts to Standard Time in late autumn, that gap shrinks by one hour.

Hawaii time offset comparison table

To quickly determine what time it is in Hawaii compared to your local area, reference the table below. It outlines the UTC offsets and exact hour differences between Hawaii Standard Time and major U.S. and international time zones during both daylight saving periods and standard time periods.

How Hawaii compares with mainland U.S. time zones

Because the mainland U.S. observes daylight saving adjustments, tracking the exact hour gap requires knowing whether daylight saving time is currently active on the mainland.

Pacific Time Zone (PT)

During Pacific Daylight Time (PDT, from mid-March to early November), Hawaii is 3 hours behind the Pacific Coast. If it is 12:00 PM in Los Angeles or Seattle, it is 9:00 AM in Honolulu. During Pacific Standard Time (PST, from early November to mid-March), Hawaii is 2 hours behind. If it is 12:00 PM PST on the West Coast, it is 10:00 AM HST in Hawaii.

Mountain Time Zone (MT) and Arizona

For states on Mountain Daylight Time (MDT), Hawaii is 4 hours behind. When Denver is at 1:00 PM MDT, Honolulu is at 9:00 AM HST. During Mountain Standard Time (MST), the gap narrows to 3 hours. Arizona is a unique exception: like Hawaii, Arizona does not observe Daylight Saving Time (except for the Navajo Nation). Because Arizona remains on MST (UTC-7) all year, Hawaii is permanently 3 hours behind Arizona year-round.

Central Time Zone (CT)

When Central Daylight Time (CDT) is active, Hawaii is 5 hours behind cities like Chicago, Dallas, and New Orleans. A 2:00 PM CDT call in Chicago corresponds to 9:00 AM HST in Hawaii. When Central Standard Time (CST) takes effect in autumn, Hawaii becomes 4 hours behind Central Time.

Eastern Time Zone (ET)

Connecting with the East Coast involves the largest time difference within the contiguous United States. During Eastern Daylight Time (EDT), Hawaii is 6 hours behind. When it is 3:00 PM EDT in New York or Atlanta, it is only 9:00 AM HST in Hawaii. When the East Coast transitions to Eastern Standard Time (EST), Hawaii is 5 hours behind. A 3:00 PM EST afternoon meeting in Boston translates to 10:00 AM HST in Honolulu.

Alaska Time Zone (AKT) and the Aleutian Islands

Most of Alaska operates on Alaska Time (AKDT/AKST, UTC-8/UTC-9). During the summer, Alaska Daylight Time is 2 hours ahead of Hawaii. In winter, Alaska Standard Time is 1 hour ahead of Hawaii. However, the far western Aleutian Islands of Alaska (west of 169°30′ W) share the same geographic longitude range as Hawaii and observe Hawaii-Aleutian Standard Time (HAST, UTC-10). Unlike Hawaii, the Aleutian Islands do observe Daylight Saving Time (HADT, UTC-9), putting them 1 hour ahead of Hawaii during summer months.

Why Hawaii does not observe Daylight Saving Time

Hawaii’s decision to forgo Daylight Saving Time stems from its tropical geography. Located at approximately 20° North latitude—far closer to the equator than any other U.S. state—Hawaii experiences relatively minor changes in daylight duration throughout the year.

According to astronomical solar data recorded by the National Oceanic and Atmospheric Administration (NOAA), the difference between the longest day of the year (summer solstice in late June) and the shortest day (winter solstice in late December) in Honolulu is roughly 2 hours and 30 minutes. On the summer solstice, sunrise in Honolulu occurs around 5:50 AM and sunset around 7:16 PM. On the winter solstice, sunrise is around 7:04 AM and sunset around 5:55 PM.

By contrast, northern mainland cities like Seattle experience over 7 hours of seasonal variation in daylight. In high-latitude regions, shifting clocks allows residents to capture extra evening sunlight during long summer days. In Hawaii, shifting clocks forward by an hour in summer would cause sunrise to occur after 6:50 AM while pushing sunset past 8:15 PM, providing little practical energy savings or benefit to agricultural and tourism sectors.

Historically, the Hawaiian Kingdom established standard time in 1896, setting local standard time at 10 hours and 30 minutes behind Greenwich Mean Time (GMT-10:30). In June 1947, the Territorial Legislature officially simplified the offset to UTC-10. When the United States Congress passed the Uniform Time Act of 1966—which standardized Daylight Saving Time nationwide—states were given the option to exempt themselves via state legislation. Hawaii formally opted out under state law in 1967 and has maintained constant Hawaii Standard Time ever since.

Calculating international time differences and the Date Line

Calculating time between Hawaii and international locations requires accounting for UTC offsets and, in many cases, crossing the International Date Line.

When communicating across the Pacific toward Asia and Australasia, Hawaii is almost always on the calendar day behind those destinations. For detailed scheduling tools covering past and future dates, see Goku Exe 2: What It Is and How to Understand It.

• Japan (UTC+9): Tokyo is 19 hours ahead of Hawaii. To easily calculate Tokyo time from Hawaii, add 5 hours to the current Hawaii time and advance the calendar day by one day. For example, if it is 10:00 AM on Tuesday in Honolulu, it is 5:00 AM on Wednesday in Tokyo.
• Australia (UTC+10 / UTC+11): Sydney is 20 hours ahead of Hawaii during Australian Eastern Standard Time (AEST) and 21 hours ahead during Australian Eastern Daylight Time (AEDT). If it is 2:00 PM on Thursday in Hawaii, it is 11:00 AM on Friday in Sydney during AEDT.
• United Kingdom (UTC+0 / UTC+1): London is 10 hours ahead of Hawaii during GMT (winter) and 11 hours ahead during British Summer Time (BST, summer). When it is 8:00 AM HST in Hawaii, it is 6:00 PM BST in London.
• Samoa (UTC+13): Samoa shifted across the International Date Line in 2011. While geographically close to Hawaii in the South Pacific, Samoa is 23 hours ahead of Hawaii. When it is 9:00 AM on Monday in Honolulu, it is 8:00 AM on Tuesday in Apia.

Understanding these shifts is vital for international travel and shipping logistics. Flights crossing between Asia or Australia and Hawaii lose or gain an entire day upon crossing the date line. A flight departing Sydney on Sunday morning can arrive in Honolulu on Saturday evening, effectively arriving before it departed according to local clock hours.

How to calculate Hawaii time manually

If you do not have an internet clock or world clock app open, you can calculate Hawaii time from any U.S. time zone using quick mental arithmetic.

Follow these steps to find Hawaii Standard Time from mainland U.S. times:

1. Identify your current local time zone and DST status: Determine whether your local region is currently observing daylight saving time (spring through early autumn) or standard time (late autumn through winter).
2. Apply the mainland offset rule:
   • From Pacific Time: Subtract 3 hours during PDT; subtract 2 hours during PST.
   • From Mountain Time: Subtract 4 hours during MDT; subtract 3 hours during MST.
   • From Central Time: Subtract 5 hours during CDT; subtract 4 hours during CST.
   • From Eastern Time: Subtract 6 hours during EDT; subtract 5 hours during EST.
3. Adjust for calendar date rollover: If your subtraction results in a time before midnight (00:00), subtract one calendar day to find Hawaii’s current date. For example, if it is 2:00 AM EDT on Monday in New York, subtracting 6 hours yields 8:00 PM (20:00) on Sunday evening in Hawaii.

For quick mental adjustments down to exact minutes, remember that Hawaii’s offset is always on a clean hourly boundary (UTC-10:00) with no fractional-hour offset.

Planning business meetings and calls with Hawaii

Coordinating professional communications between Hawaii and mainland U.S. or international offices requires deliberate scheduling due to the narrow window of overlapping business hours.

The standard business day in Hawaii runs from 8:00 AM to 5:00 PM HST. Because Hawaii is significantly behind the rest of the country, morning in Hawaii corresponds to late afternoon or evening on the mainland.

Optimal meeting windows by region

• Pacific Coast (PDT/PST): Excellent overlap. A call scheduled at 9:00 AM HST equals 12:00 PM PDT or 11:00 AM PST. The ideal window for calls between California and Hawaii is 8:00 AM to 2:00 PM HST (11:00 AM to 5:00 PM PDT).
• Central & Mountain Zones: Moderate overlap. Mid-morning in Hawaii (9:00 AM–11:00 AM HST) aligns with 2:00 PM–4:00 PM CDT or 1:00 PM–3:00 PM MDT.
• East Coast (EDT/EST): Narrow overlap. During EDT (summer), Hawaii’s workday starts at 8:00 AM HST, which is already 2:00 PM EDT. By 11:00 AM HST, the East Coast workday is ending at 5:00 PM EDT. The single practical window for East Coast to Hawaii calls is 8:00 AM to 11:00 AM HST (2:00 PM to 5:00 PM EDT).
• Japan & East Asia: Good morning/afternoon inverse overlap. A meeting scheduled for 2:00 PM HST on Monday takes place at 9:00 AM JST on Tuesday morning in Tokyo.

When sending calendar invitations, always include the explicit time zone abbreviation (HST or UTC-10). Automated calendar systems (such as Google Calendar or Microsoft Outlook) adjust automatically when set correctly, but clarifying “8:00 AM HST / 2:00 PM EDT” in the text description prevents misinterpretation.

Travel advice for adapting to Hawaii time

Travelers arriving in Hawaii from the U.S. mainland or Europe face westward jet lag, which is generally easier to manage than eastward body clock disruption. Flying west lengthens your day, making you feel tired earlier in the evening local time and inclined to wake up early in the morning.

To adjust your circadian rhythm quickly upon arrival in Hawaii, implement the following steps:

• Shift sleep hours incrementally: Three days before departure, begin going to bed and waking up 1 to 2 hours later than usual if traveling from the mainland.
• Set your watch to HST upon boarding: Mentally switch to Hawaii time as soon as you board your flight. Eat and sleep on the plane according to local Hawaii time.
• Leverage morning sunlight: Natural sunlight regulates melatonin production. Spend your first morning outdoors in the daylight to anchor your body clock to local HST.
• Resist early evening sleeping: West Coast visitors will feel sleepy around 7:00 PM HST (10:00 PM PDT), while East Coast visitors may feel exhausted by 5:00 PM HST (11:00 PM EDT). Force yourself to stay awake until at least 9:00 PM local Hawaii time on your first two nights.
• Capitalize on early morning waking: Waking up naturally at 5:00 AM or 6:00 AM HST during your first few days provides the perfect opportunity for early morning surf sessions, sunrise hikes at Haleakala on Maui, or early photography without crowds.

Science, astronomy, and government oversight of Hawaii time

The precise administration of time zones, Hawaii’s boundaries, and official timekeeping falls under the jurisdiction of the U.S. Department of Transportation (DOT) in coordination with the National Institute of Standards and Technology (NIST) and the U.S. Naval Observatory.

Consistent timekeeping without seasonal clock shifts is critical for scientific research conducted in the islands. Hawaii hosts world-leading astronomical observatories, including the W. M. Keck Observatory, the Subaru Telescope, and the Gemini Observatory on Mauna Kea (Big Island), as well as the Haleakala Observatory on Maui.

Astronomers require absolute consistency in Coordinated Universal Time logging. Standardized UTC-10 timestamps across all Hawaiian monitoring infrastructure eliminate ambiguities in multi-observatory image capture and transient event tracking across global optical and radio telescope networks.

Similarly, the U.S. Geological Survey (USGS) Hawaiian Volcano Observatory relies on precise UTC-10 time stamping for seismic, infrasound, and tiltmeter sensor networks monitoring Kilauea and Mauna Loa volcanoes. Continuous UTC synchronization ensures microsecond accuracy when correlating seismic wave arrivals across island monitoring arrays.

Common mistakes when calculating Hawaii time

Even frequent travelers and experienced business professionals make predictable mistakes when working with Hawaii Standard Time. Review these common pitfalls to avoid scheduling errors:

1. Assuming Hawaii changes clocks with California: A frequent assumption is that Hawaii always stays 2 hours behind Pacific Time. While this is true during winter (PST), Hawaii is 3 hours behind California during daylight saving time (PDT). Failing to account for this leaves callers one hour early or late.

2. Forgetting the static 5-hour EST offset: During winter standard time (EST), Hawaii is 5 hours behind the East Coast. During summer daylight time (EDT), Hawaii is 6 hours behind. Assuming the gap is constantly 5 hours leads to setting early morning calls that disturb Hawaiian residents before sunrise.

3. Ignoring calendar date shifts across the Pacific: When coordinating between Hawaii and Australia, Asia, or New Zealand, mistaking the calendar date is common. When it is late Friday afternoon in Honolulu, it is already Saturday afternoon in Sydney and Tokyo.

4. Confusing Hawaii time with Alaska time: Alaska and Hawaii are often listed together on U.S. dropdown menus, but Alaska observes Daylight Saving Time (except for specific non-observing regions) and operates on AKST (UTC-9) rather than HST (UTC-10). Alaska is 1 to 2 hours ahead of Hawaii depending on the season.

Frequently asked questions

What time zone is Honolulu, Hawaii in?

Honolulu, along with the entire state of Hawaii, is in the Hawaii Standard Time (HST) zone. Hawaii Standard Time is officially designated as UTC-10 year-round.

Does Hawaii ever change its clocks for Daylight Saving Time?

No, Hawaii does not observe Daylight Saving Time. The state remains on Hawaii Standard Time (UTC-10) all year, having officially opted out of daylight clock changes in 1967.

How many hours is Hawaii behind New York?

Hawaii is 6 hours behind New York during Eastern Daylight Time (from mid-March to early November) and 5 hours behind New York during Eastern Standard Time (from early November to mid-March).

Is Hawaii time the same as California time?

No, Hawaii is behind California time. Hawaii is 3 hours behind California during Pacific Daylight Time (spring/summer) and 2 hours behind California during Pacific Standard Time (autumn/winter).

Historical time zone reference records are maintained by research archives including Britannica.