What is the time difference between AEST and HST?

Hawaii Standard Time (HST) is 21 hours behind Australian Eastern Standard Time (AEST). AEST uses a UTC offset of UTC+11, while HST uses UTC-10. For example, when it's 9:00 AM in AEST, it's 12:00 PM in HST. Note that this difference may shift by one hour during daylight saving time transitions if AEST observes DST. Use the conversion table above to see the exact time for each hour of the day.

How do I convert AEST to HST?

To convert AEST to HST, subtract 21 hours from the AEST time. For example, 9:00 AM AEST is 12:00 PM HST, and 5:00 PM AEST is 8:00 PM HST. Keep in mind that during daylight saving time transitions, the offset between these timezones may temporarily change by one hour. You can also use the interactive converter above for quick, accurate results.

What time is it in HST when it's noon in AEST?

When it's 12:00 PM (noon) in AEST, it's 3:00 PM in HST. This is because HST is 21 hours behind AEST. Similarly, when it's 6:00 PM in AEST, it's 9:00 PM in HST. During daylight saving time transitions, these times may shift by one hour, so always verify the current offset. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours behind is HST from AEST?

HST is 21 hours behind AEST. This means when it's 9:00 AM in AEST, it's 12:00 PM in HST, and when it's midnight in AEST, it's 3:00 AM in HST. The exact difference can vary by one hour during daylight saving time transitions. The conversion table above provides a complete hour-by-hour mapping.

Is HST ahead or behind AEST?

HST is behind AEST by 21 hours. Clocks in HST show an earlier time than AEST, meaning the day starts later in HST relative to AEST. For example, when it's noon in AEST, it's still 3:00 PM in HST. This gap may change by one hour during DST transitions.

Does AEST observe daylight saving time?

Yes, Australian Eastern Standard Time observes daylight saving time. During DST, the abbreviation changes to AEDT and clocks move forward by one hour, typically in spring. Clocks then fall back in autumn, returning to standard AEST time. This means the UTC offset for AEST shifts between two values depending on the season. Check our DST change calendar for exact transition dates that may affect your AEST to HST conversions.

Does HST observe daylight saving time?

No, Hawaii Standard Time does not observe daylight saving time. The UTC offset of UTC-10 remains the same year-round, making time conversions to HST more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

What is the best time to call from AEST to HST?

The best time for a call between AEST and HST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in HST during their work day, call between 6:00 AM and 2:00 PM your AEST time. Avoid calling too early or late, as the 21 hours difference means your evening could be their early morning. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

When does daylight saving time change in AEST?

Daylight saving time transitions vary by year and region. Australian Eastern Standard Time observes DST, which typically shifts clocks forward by one hour in spring ("spring forward") and back in fall ("fall back"). During these transition periods, the time difference between AEST and HST may temporarily change by one hour, which can cause confusion for scheduled meetings or calls. It's important to double-check your conversions around transition dates, especially if the two timezones switch on different dates. Check our DST change calendar for exact transition dates in the current year.

Do AEST and HST ever have the same time?

No, AEST and HST never show the same time because their base UTC offsets are different. However, because AEST observes daylight saving time and HST does not, the time difference between them changes by one hour during DST transitions. This means the gap narrows or widens depending on the season, but the two clocks never align. Always verify the current offset around DST transition dates to avoid scheduling errors.

AEST to HST Converter

Convert Australian Eastern Standard Time to Hawaii Standard Time. See the hour-by-hour conversion table below.

Upcoming DST Change

Australian Eastern Time (AEDT) will fall back on April 5. Clocks will shift by 1 hour (AEDT → AEST).

View all DST changes

Timezone Details

Australian Eastern Standard Time

3:29 AM

Friday, April 3, 2026

AEDT (UTC+11:00)

Hawaii Standard Time

6:29 AM

Thursday, April 2, 2026

HST (UTC-10:00)

Difference: -21 hours

AEDT DST: Yes (AEDT)

HST DST: No

24-Hour Overview

AEDT — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

HST — 24-hour overview

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

12a12a

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

HST to AEST GMT to AEST AEST to GMT IST to AEST AEST to IST EST to AEST AEST to EST PST to AEST AEST to PST

Cities in These Timezones

AEST Cities

Sydney Canberra

HST Cities

Honolulu

More Tools

Compare AEST & HST Plan a Meeting (AEST & HST)See on Map

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Australian Eastern Standard Time on Wikipedia Hawaii Standard Time on Wikipedia IANA Time Zone Database