AST to AEST Converter & Meeting Planner
Quick answer: 9:00 AM AST = 11:00 PM AEST (fixed -04:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Atlantic Standard Time (AST) and Australian Eastern Standard Time (AEST)? You need to account for the standard time difference. Australian Eastern Standard Time is normally 14 hours ahead of Atlantic Standard Time. Whether you are coordinating between teams in Halifax and San Juan and Sydney and Melbourne, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM AST = 2:00 PM AEST. The full 24-hour AST to AEST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM AST = 5:00 AM AEST (+1 day).
| AST Time | AEST Time |
|---|---|
| 12:00 AM (00:00) | 2:00 PM (14:00) |
| 1:00 AM (01:00) | 3:00 PM (15:00) |
| 2:00 AM (02:00) | 4:00 PM (16:00) |
| 3:00 AM (03:00) | 5:00 PM (17:00) |
| 4:00 AM (04:00) | 6:00 PM (18:00) |
| 5:00 AM (05:00) | 7:00 PM (19:00) |
| 6:00 AM (06:00) | 8:00 PM (20:00) |
| 7:00 AM (07:00) | 9:00 PM (21:00) |
| 8:00 AM (08:00) | 10:00 PM (22:00) |
| 9:00 AM (09:00) | 11:00 PM (23:00) |
| 10:00 AM (10:00) | 12:00 AM (00:00)+1 day |
| 11:00 AM (11:00) | 1:00 AM (01:00)+1 day |
| 12:00 PM (12:00) | 2:00 AM (02:00)+1 day |
| 1:00 PM (13:00) | 3:00 AM (03:00)+1 day |
| 2:00 PM (14:00) | 4:00 AM (04:00)+1 day |
| 3:00 PM (15:00) | 5:00 AM (05:00)+1 day |
| 4:00 PM (16:00) | 6:00 AM (06:00)+1 day |
| 5:00 PM (17:00) | 7:00 AM (07:00)+1 day |
| 6:00 PM (18:00) | 8:00 AM (08:00)+1 day |
| 7:00 PM (19:00) | 9:00 AM (09:00)+1 day |
| 8:00 PM (20:00) | 10:00 AM (10:00)+1 day |
| 9:00 PM (21:00) | 11:00 AM (11:00)+1 day |
| 10:00 PM (22:00) | 12:00 PM (12:00)+1 day |
| 11:00 PM (23:00) | 1:00 PM (13:00)+1 day |
Best time to call Sydney from Halifax
For most work calls, compare the normal business day in Halifax (AST) with the business day in Sydney (AEST). AST commonly covers North America, Caribbean, while AEST is mainly associated with Oceania, Australia.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 8:00 PM AST, which reaches 9:00 AM AEST near the start of their workday.
- DST Safety: AST or AEST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Australian Securities Exchange (ASX): 10:00-16:00 local time in Sydney.
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Frequently Asked Questions
What is the time difference between AST and AEST?
During standard time, Australian Eastern Standard Time is 14 hours ahead of Atlantic Standard Time.
Does the Caribbean observe Daylight Saving Time?
The vast majority of Caribbean nations and territories — including Puerto Rico, the Dominican Republic, the US Virgin Islands, Trinidad and Tobago, and Barbados — do not observe Daylight Saving Time and remain on AST (UTC-4) year-round. This means these territories share the same clock as Halifax only during the Atlantic Standard Time window in winter, diverging by one hour once Canada and Bermuda advance to ADT each spring.
What is the difference between AST and ADT?
AST (Atlantic Standard Time) is the standard winter offset at UTC-4:00, observed from the first Sunday in November through the second Sunday in March across all AST regions. ADT (Atlantic Daylight Time) is the summer offset at UTC-3:00, applied by Eastern Canadian provinces and Bermuda when they advance their clocks by one hour during Daylight Saving Time.
Does all of eastern Australia observe Daylight Saving Time?
No — eastern Australia is split on DST. New South Wales (Sydney), Victoria (Melbourne), Tasmania (Hobart), and the ACT (Canberra) advance their clocks to AEDT (UTC+11) each October, while Queensland (Brisbane) opts out entirely and remains on AEST (UTC+10) year-round. This means Sydney and Brisbane run on the same clock for only part of the year.
What is the difference between AEST and AEDT?
AEST (Australian Eastern Standard Time) is the UTC+10:00 offset observed during the Southern Hemisphere winter months, roughly April through October. AEDT (Australian Eastern Daylight Time) is the UTC+11:00 offset applied during the Southern Hemisphere summer when clocks spring forward in October, observed by New South Wales, Victoria, Tasmania, and the ACT.