Perth to AST
-12hPerth
AWSTSOURCEAST
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
AWST and AST on the World Map
The map below highlights the AWST (Australian Western Standard Time) and AST (Atlantic 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.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •Puerto Rico uses AST year-round and does not observe DST.
- •AST is 1 hour ahead of EST.
- •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
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 to AST Time Difference – Complete Guide
Perth runs on Australian Western Standard Time (AWST) at UTC+08:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts Perth 12 hours behind AST — a difference of -12h at the current offsets.
In practice, when it is 9:00 AM in Perth it is 9:00 PM in AST on the previous day. Midnight in Perth is 12:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Perth to AST time conversion table
| Perth (AWST) | AST (AST) | Day |
|---|---|---|
| 12:00 AM | 12:00 PM | previous day |
| 6:00 AM | 6:00 PM | previous day |
| 7:00 AM | 7:00 PM | previous day |
| 8:00 AM | 8:00 PM | previous day |
| 9:00 AM | 9:00 PM | previous day |
| 12:00 PM | 12:00 AM | same day |
| 3:00 PM | 3:00 AM | same day |
| 5:00 PM | 5:00 AM | same day |
| 6:00 PM | 6:00 AM | same day |
| 9:00 PM | 9:00 AM | same day |
Why people convert Perth to AST time
- Scheduling a call from Perth to AST: a 10:00 AM start in Perth lands at 10:00 PM in AST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -12h gap: Perth and AST 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 AST is 9:00 PM in Perth.
- Watching a live event or market open: Perth viewers need 9:00 PM in AST to catch a 9:00 AM start there, and 12:00 PM if the event is anchored to Perth.
- Always state the zone abbreviation, not just the hour. "3:00 PM AWST" is unambiguous; "3 PM" across a -12h gap is not.
- With a -12h gap there is no shared 9-to-5 window, so alternate the early start: one week Perth takes the early slot, the next week AST 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 AST (Atlantic Standard Time)
Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.
Best time to call between Perth and AST
With a -12h offset there is no overlap inside a normal 9 AM – 5 PM day. AST opens at 9:00 AM AST, which is 9:00 PM in Perth, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Perth and AST have no shared working hours because of the -12h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Perth is 12 hours behind AST (AWST UTC+08:00 → AST UTC-04:00). 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
Perth
Does not observe DST
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 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 Perth and AST?
Perth (AWST, UTC+08:00) is 12 hours behind AST (AST, UTC-04:00). The gap is currently -12h.
How do I convert Perth time to AST time?
Add -12h to Perth local time. For example, 9:00 AM in Perth is 9:00 PM in AST (previous day).
What time is it in AST right now?
AST uses AST at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -12h offset from Perth.
What is the best time to call AST from Perth?
There is no shared working-hours window because of the -12h gap. The closest option is 1:00 PM in Perth, which is 1:00 AM in AST.
Which is behind, Perth or AST?
Perth is 12 hours behind AST. When it is 12:00 PM in Perth it is 12:00 AM in AST.
Do Perth and AST use different time zones?
Perth (Australia) uses AWST at UTC+08:00, while AST uses AST at UTC-04:00. The IANA identifiers are Australia/Perth and America/Halifax.
Does daylight saving time affect the Perth–AST difference?
Neither zone observes daylight saving time, so the -12h offset between Perth and AST 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 AST?
Sometimes. The -12h gap is large enough that 8:00 PM or later in Perth already falls on the in AST.
What is the time difference between Perth and AST?
AST is -12h 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 AST in?
AST 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 AST timezone?
Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
What is the UTC offset for AST?
Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.
What should I know about the AST timezone?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
When is it midnight in Perth, what time is it in AST?
When it is 12:00 AM (midnight) in Perth (AWST), it is -12h later in AST (AST).
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