HST SydneyTime Converter
HST (UTC−10) is currently 20 hours behind Sydney (AEST, UTC+10). Compare live clocks, convert any hour, and find times to meet.
Quick answer
When it's in HST, it's the next day in Sydney.
HST runs 20 hours behind Sydney (AEST/AEDT). Both sides keep standard office hours with a real 9–6 overlap — the highlighted window below works for everyone.
- Time difference
- +20h 00m
- HST
- UTC−10
- Sydney
- UTC+10
- Best call window
- 1:00 PM HST
HST to Sydney conversion table
The next 12 hours in HST and the matching local time in Sydney. The current hour is highlighted; drag the converter's slider and the table follows.
| HST | Sydney · AEST |
|---|---|
| NOW Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Best time to meet between HST & Sydney
Working hours are 9am–6pm in each city. The bright band is where they overlap — when both sides are at their desks.
Daylight saving shifts this gap by up to 1 hour
The difference between HST and Sydney swings between 20 and 21 hours across the year as each side starts or ends daylight saving. Clocks in Sydney move forward 1 hour to AEDT (UTC+11) on Sunday, October 4, 2026. This page always shows the live, DST-aware difference.
Related time zone conversions
Jump straight to another pair — every combination is a live tool, not an article.
From HST
To Sydney
One source of truth — for you and your AI
This page exposes the same answer as structured data, so when you ask an assistant "what's 9am HST time in Sydney?", it can cite the exact, DST-aware result — not a stale blog post.
- Schema.org JSON-LD on every converter page
- A machine-readable facts island with IANA zones and every possible offset
- Live times in <time datetime> elements with explicit UTC offsets
{
"pair": "HST → Sydney",
"url": "https://worldclock.pro/en/convert/hst-to-sydney",
"from": {
"name": "HST",
"type": "timezone",
"abbreviation": "HST",
"daylightAbbreviation": null,
"iana": "Pacific/Honolulu",
"standardUtcOffset": "-10:00",
"daylightUtcOffset": null,
"referenceCity": "Honolulu"
},
"to": {
"name": "Sydney",
"type": "city",
"abbreviation": "AEST",
"daylightAbbreviation": "AEDT",
"iana": "Australia/Sydney",
"standardUtcOffset": "+10:00",
"daylightUtcOffset": "+11:00",
"referenceCity": "Sydney"
},
"currentDifferenceMinutes": 1200,
"possibleDifferencesMinutes": [
1200,
1260
],
"note": "Between the regions that use these zones the difference is 20 and 21 hours across the year, depending on daylight saving on each side. The clocks on this page show the named zones themselves, which are fixed."
}
Frequently asked questions
What is the time difference between HST and Sydney?
HST is currently 20 hours behind Sydney. HST is on HST (UTC−10) and Sydney is on AEST (UTC+10). The difference can change when either side starts or ends daylight saving time.
Is Sydney ahead of or behind HST?
Sydney is currently 20 hours ahead of HST.
When it is 9:00 AM in HST, what time is it in Sydney?
When it is 9:00 AM on a Monday in HST, it is 5:00 AM the next day in Sydney.
Do HST and Sydney observe daylight saving time?
HST does not observe daylight saving time. Clocks in Sydney move forward 1 hour to AEDT (UTC+11) on Sunday, October 4, 2026.
How do I convert HST time to Sydney time?
Add 20 hours to any time in HST to get the time in Sydney. This page's converter and 24-hour table do it automatically and stay correct through daylight-saving changes.
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