HST to AEST
+20hHST
HSTSOURCEAEST
AESTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and AEST on the World Map
The map below highlights the HST (Hawaii Standard Time) and AEST (Australian Eastern Standard Time) timezone regions across the globe.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •Hawaii does not observe daylight saving time.
- •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
- •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •Queensland does not observe daylight saving time, staying on AEST year-round.
- •Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
- •The Australian Securities Exchange (ASX) operates on AEST/AEDT.
- •AEST is 15 hours ahead of EST during winter.
Time Conversion Guide: HST to AEST
HST runs on Hawaii Standard Time (HST) at UTC-10:00. AEST runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts HST 20 hours ahead of AEST — a difference of +20h at the current offsets.
In practice, when it is 9:00 AM in HST it is 5:00 AM in AEST on the next day. Midnight in HST is 8:00 PM in AEST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HST to AEST time conversion table
| HST (HST) | AEST (AEST) | Day |
|---|---|---|
| 12:00 AM | 8:00 PM | same day |
| 6:00 AM | 2:00 AM | next day |
| 7:00 AM | 3:00 AM | next day |
| 8:00 AM | 4:00 AM | next day |
| 9:00 AM | 5:00 AM | next day |
| 12:00 PM | 8:00 AM | next day |
| 3:00 PM | 11:00 AM | next day |
| 5:00 PM | 1:00 PM | next day |
| 6:00 PM | 2:00 PM | next day |
| 9:00 PM | 5:00 PM | next day |
Why people convert HST to AEST time
- Scheduling a call from HST to AEST: a 10:00 AM start in HST lands at 6:00 AM in AEST the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +20h gap: HST and AEST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in AEST is 5:00 AM in HST.
- Watching a live event or market open: HST viewers need 5:00 AM in AEST to catch a 9:00 AM start there, and 4:00 AM if the event is anchored to HST.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" is unambiguous; "3 PM" across a +20h gap is not.
- With a +20h gap there is no shared 9-to-5 window, so alternate the early start: one week HST takes the early slot, the next week AEST does.
About HST (Hawaii Standard Time)
Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.
About AEST (Australian Eastern Standard Time)
Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.
Best time to call between HST and AEST
With a +20h offset there is no overlap inside a normal 9 AM – 5 PM day. AEST opens at 9:00 AM AEST, which is 5:00 AM in HST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
HST and AEST have no shared working hours because of the +20h gap. Teams need to alternate early starts or rely on asynchronous handovers.
HST is 20 hours ahead of AEST (HST UTC-10:00 → AEST UTC+10:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
HST
Does not observe DST
AEST
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between HST and AEST?
HST (HST, UTC-10:00) is 20 hours ahead of AEST (AEST, UTC+10:00). The gap is currently +20h.
How do I convert HST time to AEST time?
Add +20h to HST local time. For example, 9:00 AM in HST is 5:00 AM in AEST (next day).
What time is it in AEST right now?
AEST uses AEST at UTC+10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +20h offset from HST.
What is the best time to call AEST from HST?
There is no shared working-hours window because of the +20h gap. The closest option is 1:00 PM in HST, which is 9:00 AM in AEST.
Which is ahead, HST or AEST?
HST is 20 hours ahead of AEST. When it is 12:00 PM in HST it is 8:00 AM in AEST.
Does daylight saving time affect the HST–AEST difference?
Neither zone observes daylight saving time, so the +20h offset between HST and AEST is fixed all year.
Which other cities share HST's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, HST's zone?
HST is used in United States (Hawaii).
Is there a day difference between HST and AEST?
Sometimes. The +20h gap is large enough that 8:00 PM or later in HST already falls on the next day in AEST.
What is the time difference between HST and AEST?
AEST is +20h from HST.
What timezone is HST in?
HST operates on its local timezone.
What timezone is AEST in?
AEST operates on its local timezone.
Which countries use HST (Hawaii Standard Time)?
HST is used in United States (Hawaii).
Does HST observe daylight saving time?
No, HST does not observe daylight saving time and remains at UTC-10:00 year-round.
What are some interesting facts about HST?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
Which cities are in the AEST timezone?
Major cities in the AEST timezone include Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
What is the UTC offset for AEST?
Australian Eastern Standard Time (AEST) is at UTC+10:00. During daylight saving time, it shifts to AEDT.
What should I know about the AEST timezone?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
When is it midnight in HST, what time is it in AEST?
When it is 12:00 AM (midnight) in HST (HST), it is +20h later in AEST (AEST).
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See every conversion from HST →·See every conversion from AEST →