What is the time difference between HST and AEST?

Australian Eastern Standard Time (AEST) is 21 hours ahead of Hawaii Standard Time (HST). HST uses a UTC offset of UTC-10, while AEST uses UTC+11. For example, when it's 9:00 AM in HST, it's 6:00 AM in AEST. 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 HST to AEST?

To convert HST to AEST, add 21 hours to the HST time. For example, 9:00 AM HST is 6:00 AM AEST, and 5:00 PM HST is 2:00 PM AEST. 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 AEST when it's noon in HST?

When it's 12:00 PM (noon) in HST, it's 9:00 AM in AEST. This is because AEST is 21 hours ahead of HST. Similarly, when it's 6:00 PM in HST, it's 3:00 PM in AEST. 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 ahead is AEST from HST?

AEST is 21 hours ahead of HST. This means when it's 9:00 AM in HST, it's 6:00 AM in AEST, and when it's midnight in HST, it's 9:00 PM in AEST. 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 AEST ahead or behind HST?

AEST is ahead of HST by 21 hours. Clocks in AEST show a later time than HST, meaning the day starts earlier in AEST relative to HST. For example, when it's morning in HST, it's already afternoon or evening in AEST. This gap may change by one hour during DST transitions.

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 from HST more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

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 HST to AEST conversions.

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

The best time for a call between HST and AEST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in AEST during their work day, call between 12:00 PM and 8:00 PM your HST time. Avoid calling too early or late, as the 21 hours difference means your evening could be their late night. 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 HST and AEST 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 HST and AEST ever have the same time?

No, HST and AEST 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.

HST to AEST Converter

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

Timezone Details

Hawaii Standard Time

9:20 PM

Sunday, October 18, 2026

HST (UTC-10:00)

Australian Eastern Standard Time

6:20 PM

Monday, October 19, 2026

AEDT (UTC+11:00)

Difference: +21 hours

HST DST: No

AEDT DST: Yes (AEDT)

24-Hour Overview

HST — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

AEDT — 24-hour overview

9p9p

10p

11p

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

AEST to HST 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

HST Cities

Honolulu

AEST Cities

Sydney Canberra

More Tools

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

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

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