Perth to HST
-18hPerth
AWSTSOURCEHST
HSTGreen rows indicate typical business hours (9 AM - 5 PM)
AWST and HST on the World Map
The map below highlights the AWST (Australian Western Standard Time) and HST (Hawaii Standard Time) timezone regions across the globe.
AWST – Australian Western Standard Time
UTC+08:00Australian Western Standard Time (AWST) is the time zone for Western Australia, 8 hours ahead of UTC.
- •Western Australia does not observe daylight saving time.
- •Perth is the most isolated major city in the world.
- •AWST is the same offset as China Standard Time and Singapore Time.
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).
About Perth
WikipediaPerth operates on Australian Western Time (AWST), UTC+8 with no daylight saving. As Australia's mining capital, Perth coordinates with Asian markets.
Western Australia does not observe daylight saving time.
Perth vs HST: Offsets, DST and Best Call Times
Perth runs on Australian Western Standard Time (AWST) at UTC+08:00. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts Perth 18 hours behind HST — a difference of -18h at the current offsets.
In practice, when it is 9:00 AM in Perth it is 3:00 PM in HST on the previous day. Midnight in Perth is 6:00 AM in HST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Perth to HST time conversion table
| Perth (AWST) | HST (HST) | Day |
|---|---|---|
| 12:00 AM | 6:00 AM | previous day |
| 6:00 AM | 12:00 PM | previous day |
| 7:00 AM | 1:00 PM | previous day |
| 8:00 AM | 2:00 PM | previous day |
| 9:00 AM | 3:00 PM | previous day |
| 12:00 PM | 6:00 PM | previous day |
| 3:00 PM | 9:00 PM | previous day |
| 5:00 PM | 11:00 PM | previous day |
| 6:00 PM | 12:00 AM | same day |
| 9:00 PM | 3:00 AM | same day |
Why people convert Perth to HST time
- Scheduling a call from Perth to HST: a 10:00 AM start in Perth lands at 4:00 PM in HST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -18h gap: Perth and HST 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 HST is 3:00 PM in Perth.
- Keeping family and friends in sync: knowing that 8:00 PM in Perth is 2:00 AM in HST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM AWST" is unambiguous; "3 PM" across a -18h gap is not.
- With a -18h gap there is no shared 9-to-5 window, so alternate the early start: one week Perth takes the early slot, the next week HST does.
About AWST (Australian Western Standard Time)
Australian Western Standard Time (AWST) is used in Western Australia. WA does not observe daylight saving time, having rejected it in multiple referendums. Perth is the most remote major city in the world.
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.
Best time to call between Perth and HST
With a -18h offset there is no overlap inside a normal 9 AM – 5 PM day. HST opens at 9:00 AM HST, which is 3:00 PM in Perth, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Perth and HST have no shared working hours because of the -18h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Perth is 18 hours behind HST (AWST UTC+08:00 → HST 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.
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 Perth and HST?
Perth (AWST, UTC+08:00) is 18 hours behind HST (HST, UTC-10:00). The gap is currently -18h.
How do I convert Perth time to HST time?
Add -18h to Perth local time. For example, 9:00 AM in Perth is 3:00 PM in HST (previous day).
What time is it in HST right now?
HST uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -18h offset from Perth.
What is the best time to call HST from Perth?
There is no shared working-hours window because of the -18h gap. The closest option is 1:00 PM in Perth, which is 7:00 PM in HST.
Which is behind, Perth or HST?
Perth is 18 hours behind HST. When it is 12:00 PM in Perth it is 6:00 PM in HST.
Do Perth and HST use different time zones?
Perth (Australia) uses AWST at UTC+08:00, while HST uses HST at UTC-10:00. The IANA identifiers are Australia/Perth and Pacific/Honolulu.
Does daylight saving time affect the Perth–HST difference?
Neither zone observes daylight saving time, so the -18h offset between Perth and HST is fixed all year.
Which other cities share Perth's time zone?
AWST also covers Perth, Mandurah, Bunbury, Geraldton.
Which countries use AWST, Perth's zone?
AWST is used in Australia (Western Australia).
Is there a day difference between Perth and HST?
Sometimes. The -18h gap is large enough that 8:00 PM or later in Perth already falls on the in HST.
What is the time difference between Perth and HST?
HST is -18h from Perth.
What timezone is Perth in?
Perth operates on Australian Western Time (AWST), UTC+8 with no daylight saving. As Australia's mining capital, Perth coordinates with Asian markets.
What timezone is HST in?
HST operates on its local timezone.
What are the business hours in Perth?
Standard business hours in Perth are 9:00 AM - 5:00 PM AWST.
Which countries use AWST (Australian Western Standard Time)?
AWST is used in Australia (Western Australia).
Does AWST observe daylight saving time?
No, AWST does not observe daylight saving time and remains at UTC+08:00 year-round.
What are some interesting facts about AWST?
Western Australia does not observe daylight saving time. Perth is the most isolated major city in the world.
Which cities are in the HST timezone?
Major cities in the HST timezone include Honolulu, Hilo, Kailua, Pearl City, Kapolei.
What is the UTC offset for HST?
Hawaii Standard Time (HST) is at UTC-10:00.
What should I know about the HST timezone?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
When is it midnight in Perth, what time is it in HST?
When it is 12:00 AM (midnight) in Perth (AWST), it is -18h later in HST (HST).
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