AST to Sydney
+14hAST
ASTSOURCESydney
AESTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and AEST on the World Map
The map below highlights the AST (Atlantic Standard Time) and AEST (Australian Eastern 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.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •Queensland does not observe daylight saving time, staying on AEST year-round.
- •Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
- •The Australian Securities Exchange (ASX) operates on AEST/AEDT.
- •AEST is 15 hours ahead of EST during winter.
About Sydney
WikipediaSydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
Sydney is one of the first major cities to welcome the New Year.
AST vs Sydney: Offsets, DST and Best Call Times
AST runs on Atlantic Standard Time (AST) at UTC-04:00. Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts AST 14 hours ahead of Sydney — a difference of +14h at the current offsets.
In practice, when it is 9:00 AM in AST it is 11:00 PM in Sydney. Midnight in AST is 2:00 PM in Sydney. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to Sydney time conversion table
| AST (AST) | Sydney (AEST) | Day |
|---|---|---|
| 12:00 AM | 2:00 PM | same day |
| 6:00 AM | 8:00 PM | same day |
| 7:00 AM | 9:00 PM | same day |
| 8:00 AM | 10:00 PM | same day |
| 9:00 AM | 11:00 PM | same day |
| 12:00 PM | 2:00 AM | next day |
| 3:00 PM | 5:00 AM | next day |
| 5:00 PM | 7:00 AM | next day |
| 6:00 PM | 8:00 AM | next day |
| 9:00 PM | 11:00 AM | next day |
Why people convert AST to Sydney time
- Scheduling a call from AST to Sydney: a 10:00 AM start in AST lands at 12:00 AM in Sydney the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +14h gap: AST and Sydney 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 Sydney is 11:00 PM in AST.
- Booking travel or deliveries: tracking Sydney local time against AST keeps pickup windows and arrival estimates honest across the +14h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +14h gap is not.
- With a +14h gap there is no shared 9-to-5 window, so alternate the early start: one week AST takes the early slot, the next week Sydney does.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Any meeting series spanning that date will shift by an hour in local time.
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 AEST (Australian Eastern Standard Time)
Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.
Best time to call between AST and Sydney
With a +14h offset there is no overlap inside a normal 9 AM – 5 PM day. Sydney opens at 9:00 AM AEST, which is 11:00 PM in AST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AST and Sydney have no shared working hours because of the +14h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AST is 14 hours ahead of Sydney (AST UTC-04:00 → AEST 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.
🕐 Daylight Saving Time Info
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
Sydney
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.
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 Sydney?
AST (AST, UTC-04:00) is 14 hours ahead of Sydney (AEST, UTC+10:00). The gap is currently +14h.
How do I convert AST time to Sydney time?
Add +14h to AST local time. For example, 9:00 AM in AST is 11:00 PM in Sydney.
What time is it in Sydney right now?
Sydney uses AEST at UTC+10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +14h offset from AST.
What is the best time to call Sydney from AST?
There is no shared working-hours window because of the +14h gap. The closest option is 1:00 PM in AST, which is 3:00 AM in Sydney.
Which is ahead, AST or Sydney?
AST is 14 hours ahead of Sydney. When it is 12:00 PM in AST it is 2:00 AM in Sydney.
Do AST and Sydney use different time zones?
AST uses AST at UTC-04:00, while Sydney (Australia) uses AEST at UTC+10:00. The IANA identifiers are America/Halifax and Australia/Sydney.
Does daylight saving time affect the AST–Sydney difference?
Neither zone observes daylight saving time, so the +14h offset between AST and Sydney 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 Sydney?
Sometimes. The +14h gap is large enough that 8:00 PM or later in AST already falls on the next day in Sydney.
What is the time difference between AST and Sydney?
Sydney is +14h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is Sydney in?
Sydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
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 AEST timezone?
Major cities in the AEST timezone include Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
What is the UTC offset for AEST?
Australian Eastern Standard Time (AEST) is at UTC+10:00. During daylight saving time, it shifts to AEDT.
What should I know about the AEST timezone?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
When is it midnight in AST, what time is it in Sydney?
When it is 12:00 AM (midnight) in AST (AST), it is +14h later in Sydney (AEST).
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