HST to AEST Converter & Meeting Planner
Quick answer: 9:00 AM HST = 5:00 AM AEST (fixed -10:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Hawaii-Aleutian Standard Time (HST) and Australian Eastern Standard Time (AEST)? You need to account for the standard time difference. Australian Eastern Standard Time is normally 20 hours ahead of Hawaii-Aleutian Standard Time. Whether you are coordinating between teams in Honolulu and Hilo and Sydney and Melbourne, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM HST = 8:00 PM AEST. The full 24-hour HST to AEST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM HST = 11:00 AM AEST (+1 day).
| HST Time | AEST Time |
|---|---|
| 12:00 AM (00:00) | 8:00 PM (20:00) |
| 1:00 AM (01:00) | 9:00 PM (21:00) |
| 2:00 AM (02:00) | 10:00 PM (22:00) |
| 3:00 AM (03:00) | 11:00 PM (23:00) |
| 4:00 AM (04:00) | 12:00 AM (00:00)+1 day |
| 5:00 AM (05:00) | 1:00 AM (01:00)+1 day |
| 6:00 AM (06:00) | 2:00 AM (02:00)+1 day |
| 7:00 AM (07:00) | 3:00 AM (03:00)+1 day |
| 8:00 AM (08:00) | 4:00 AM (04:00)+1 day |
| 9:00 AM (09:00) | 5:00 AM (05:00)+1 day |
| 10:00 AM (10:00) | 6:00 AM (06:00)+1 day |
| 11:00 AM (11:00) | 7:00 AM (07:00)+1 day |
| 12:00 PM (12:00) | 8:00 AM (08:00)+1 day |
| 1:00 PM (13:00) | 9:00 AM (09:00)+1 day |
| 2:00 PM (14:00) | 10:00 AM (10:00)+1 day |
| 3:00 PM (15:00) | 11:00 AM (11:00)+1 day |
| 4:00 PM (16:00) | 12:00 PM (12:00)+1 day |
| 5:00 PM (17:00) | 1:00 PM (13:00)+1 day |
| 6:00 PM (18:00) | 2:00 PM (14:00)+1 day |
| 7:00 PM (19:00) | 3:00 PM (15:00)+1 day |
| 8:00 PM (20:00) | 4:00 PM (16:00)+1 day |
| 9:00 PM (21:00) | 5:00 PM (17:00)+1 day |
| 10:00 PM (22:00) | 6:00 PM (18:00)+1 day |
| 11:00 PM (23:00) | 7:00 PM (19:00)+1 day |
Best time to call Sydney from Honolulu
For most work calls, compare the normal business day in Honolulu (HST) with the business day in Sydney (AEST). HST commonly covers Pacific Ocean, North America, while AEST is mainly associated with Oceania, Australia.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 1:00 PM - 5:00 PM HST, which corresponds to 9:00 AM - 1:00 PM AEST. This window sits inside the typical HST workday (9:00 AM - 5:00 PM) and the AEST workday (9:00 AM - 5:00 PM).
- DST Safety: HST or AEST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Australian Securities Exchange (ASX): 10:00-16:00 local time in Sydney.
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Frequently Asked Questions
What is the time difference between HST and AEST?
During standard time, Australian Eastern Standard Time is 20 hours ahead of Hawaii-Aleutian Standard Time.
Does Hawaii observe Daylight Saving Time?
Hawaii does not observe Daylight Saving Time and has not done so since 1947, remaining fixed at UTC-10:00 year-round. At roughly 20° North latitude, Hawaii's daylight hours vary by only about 1.5 hours between the summer and winter solstices — far too little to justify the disruption of a seasonal clock change.
Why is it called Hawaii-Aleutian time?
The name combines two geographically distant US territories that share the same UTC-10:00 standard offset: the Hawaiian Islands in the central Pacific and the westernmost Aleutian Islands of Alaska, which extend past the 180° meridian into the Eastern Hemisphere. Despite sharing a base offset, they behave differently — Hawaii observes no DST, while the Aleutian communities such as Adak do advance to HDT (UTC-9) each summer.
Does all of eastern Australia observe Daylight Saving Time?
No — eastern Australia is split on DST. New South Wales (Sydney), Victoria (Melbourne), Tasmania (Hobart), and the ACT (Canberra) advance their clocks to AEDT (UTC+11) each October, while Queensland (Brisbane) opts out entirely and remains on AEST (UTC+10) year-round. This means Sydney and Brisbane run on the same clock for only part of the year.
What is the difference between AEST and AEDT?
AEST (Australian Eastern Standard Time) is the UTC+10:00 offset observed during the Southern Hemisphere winter months, roughly April through October. AEDT (Australian Eastern Daylight Time) is the UTC+11:00 offset applied during the Southern Hemisphere summer when clocks spring forward in October, observed by New South Wales, Victoria, Tasmania, and the ACT.