HST to AWST
+18hHST
HSTSOURCEAWST
AWSTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and AWST on the World Map
The map below highlights the HST (Hawaii Standard Time) and AWST (Australian Western 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).
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 vs AWST: Offsets, DST and Best Call Times
HST runs on Hawaii Standard Time (HST) at UTC-10:00. AWST runs on Australian Western Standard Time (AWST) at UTC+08:00. That puts HST 18 hours ahead of AWST — a difference of +18h at the current offsets.
In practice, when it is 9:00 AM in HST it is 3:00 AM in AWST on the next day. Midnight in HST is 6:00 PM in AWST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HST to AWST time conversion table
| HST (HST) | AWST (AWST) | Day |
|---|---|---|
| 12:00 AM | 6:00 PM | same day |
| 6:00 AM | 12:00 AM | next day |
| 7:00 AM | 1:00 AM | next day |
| 8:00 AM | 2:00 AM | next day |
| 9:00 AM | 3:00 AM | next day |
| 12:00 PM | 6:00 AM | next day |
| 3:00 PM | 9:00 AM | next day |
| 5:00 PM | 11:00 AM | next day |
| 6:00 PM | 12:00 PM | next day |
| 9:00 PM | 3:00 PM | next day |
Why people convert HST to AWST time
- Scheduling a call from HST to AWST: a 10:00 AM start in HST lands at 4:00 AM in AWST the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +18h gap: HST and AWST 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 AWST is 3:00 AM in HST.
- Watching a live event or market open: HST viewers need 3:00 AM in AWST to catch a 9:00 AM start there, and 6:00 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 +18h gap is not.
- With a +18h gap there is no shared 9-to-5 window, so alternate the early start: one week HST takes the early slot, the next week AWST 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 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.
Best time to call between HST and AWST
With a +18h offset there is no overlap inside a normal 9 AM – 5 PM day. AWST opens at 9:00 AM AWST, which is 3:00 AM in HST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
HST and AWST have no shared working hours because of the +18h gap. Teams need to alternate early starts or rely on asynchronous handovers.
HST is 18 hours ahead of AWST (HST UTC-10:00 → AWST UTC+08:00). 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 HST and AWST?
HST (HST, UTC-10:00) is 18 hours ahead of AWST (AWST, UTC+08:00). The gap is currently +18h.
How do I convert HST time to AWST time?
Add +18h to HST local time. For example, 9:00 AM in HST is 3:00 AM in AWST (next day).
What time is it in AWST right now?
AWST uses AWST at UTC+08:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +18h offset from HST.
What is the best time to call AWST from HST?
There is no shared working-hours window because of the +18h gap. The closest option is 1:00 PM in HST, which is 7:00 AM in AWST.
Which is ahead, HST or AWST?
HST is 18 hours ahead of AWST. When it is 12:00 PM in HST it is 6:00 AM in AWST.
Does daylight saving time affect the HST–AWST difference?
Neither zone observes daylight saving time, so the +18h offset between HST and AWST 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 AWST?
Sometimes. The +18h gap is large enough that 8:00 PM or later in HST already falls on the next day in AWST.
What is the time difference between HST and AWST?
AWST is +18h from HST.
What timezone is HST in?
HST operates on its local timezone.
What timezone is AWST in?
AWST 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 AWST timezone?
Major cities in the AWST timezone include Perth, Mandurah, Bunbury, Geraldton.
What is the UTC offset for AWST?
Australian Western Standard Time (AWST) is at UTC+08:00.
What should I know about the AWST timezone?
Western Australia does not observe daylight saving time. Perth is the most isolated major city in the world.
When is it midnight in HST, what time is it in AWST?
When it is 12:00 AM (midnight) in HST (HST), it is +18h later in AWST (AWST).
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