AWST to AST
-12hAWST
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.
Everything You Need to Know About AWST and AST Time
AWST runs on Australian Western Standard Time (AWST) at UTC+08:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts AWST 12 hours behind AST — a difference of -12h at the current offsets.
In practice, when it is 9:00 AM in AWST it is 9:00 PM in AST on the previous day. Midnight in AWST is 12:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AWST to AST time conversion table
| AWST (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 AWST to AST time
- Scheduling a call from AWST to AST: a 10:00 AM start in AWST 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: AWST 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 AWST.
- Coordinating a AWST-based team with AST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- 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 AWST 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 AWST 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 AWST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AWST and AST have no shared working hours because of the -12h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AWST 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
AWST
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 AWST and AST?
AWST (AWST, UTC+08:00) is 12 hours behind AST (AST, UTC-04:00). The gap is currently -12h.
How do I convert AWST time to AST time?
Add -12h to AWST local time. For example, 9:00 AM in AWST 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 AWST.
What is the best time to call AST from AWST?
There is no shared working-hours window because of the -12h gap. The closest option is 1:00 PM in AWST, which is 1:00 AM in AST.
Which is behind, AWST or AST?
AWST is 12 hours behind AST. When it is 12:00 PM in AWST it is 12:00 AM in AST.
Does daylight saving time affect the AWST–AST difference?
Neither zone observes daylight saving time, so the -12h offset between AWST and AST is fixed all year.
Which other cities share AWST's time zone?
AWST also covers Perth, Mandurah, Bunbury, Geraldton.
Which countries use AWST, AWST's zone?
AWST is used in Australia (Western Australia).
Is there a day difference between AWST and AST?
Sometimes. The -12h gap is large enough that 8:00 PM or later in AWST already falls on the in AST.
What is the time difference between AWST and AST?
AST is -12h from AWST.
What timezone is AWST in?
AWST operates on its local timezone.
What timezone is AST in?
AST operates on its local timezone.
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 AWST, what time is it in AST?
When it is 12:00 AM (midnight) in AWST (AWST), it is -12h later in AST (AST).
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See every conversion from AWST →·See every conversion from AST →