AST to AWST
+12hAST
ASTSOURCEAWST
AWSTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and AWST on the World Map
The map below highlights the AST (Atlantic Standard Time) and AWST (Australian Western Standard Time) timezone regions across the globe.
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.
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.
Everything You Need to Know About AST and AWST Time
AST runs on Atlantic Standard Time (AST) at UTC-04:00. AWST runs on Australian Western Standard Time (AWST) at UTC+08:00. That puts AST 12 hours ahead of AWST — a difference of +12h at the current offsets.
In practice, when it is 9:00 AM in AST it is 9:00 PM in AWST. Midnight in AST is 12:00 PM in AWST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to AWST time conversion table
| AST (AST) | AWST (AWST) | Day |
|---|---|---|
| 12:00 AM | 12:00 PM | same day |
| 6:00 AM | 6:00 PM | same day |
| 7:00 AM | 7:00 PM | same day |
| 8:00 AM | 8:00 PM | same day |
| 9:00 AM | 9:00 PM | same day |
| 12:00 PM | 12:00 AM | next day |
| 3:00 PM | 3:00 AM | next day |
| 5:00 PM | 5:00 AM | next day |
| 6:00 PM | 6:00 AM | next day |
| 9:00 PM | 9:00 AM | next day |
Why people convert AST to AWST time
- Scheduling a call from AST to AWST: a 10:00 AM start in AST lands at 10:00 PM in AWST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +12h gap: AST 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 9:00 PM in AST.
- Keeping family and friends in sync: knowing that 8:00 PM in AST is 8:00 AM in AWST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" 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 AST takes the early slot, the next week AWST does.
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.
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 AST and AWST
With a +12h offset there is no overlap inside a normal 9 AM – 5 PM day. AWST opens at 9:00 AM AWST, which is 9:00 PM in AST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AST and AWST have no shared working hours because of the +12h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AST is 12 hours ahead of AWST (AST UTC-04:00 → 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.
🕐 Daylight Saving Time Info
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
AWST
Does not observe DST
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 AST and AWST?
AST (AST, UTC-04:00) is 12 hours ahead of AWST (AWST, UTC+08:00). The gap is currently +12h.
How do I convert AST time to AWST time?
Add +12h to AST local time. For example, 9:00 AM in AST is 9:00 PM in AWST.
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 +12h offset from AST.
What is the best time to call AWST from AST?
There is no shared working-hours window because of the +12h gap. The closest option is 1:00 PM in AST, which is 1:00 AM in AWST.
Which is ahead, AST or AWST?
AST is 12 hours ahead of AWST. When it is 12:00 PM in AST it is 12:00 AM in AWST.
Does daylight saving time affect the AST–AWST difference?
Neither zone observes daylight saving time, so the +12h offset between AST and AWST is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and AWST?
Sometimes. The +12h gap is large enough that 8:00 PM or later in AST already falls on the next day in AWST.
What is the time difference between AST and AWST?
AWST is +12h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is AWST in?
AWST operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
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 AST, what time is it in AWST?
When it is 12:00 AM (midnight) in AST (AST), it is +12h later in AWST (AWST).
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See every conversion from AST →·See every conversion from AWST →