AST to EST Converter & Meeting Planner
Quick answer: 9:00 AM AST = 8:00 AM EST (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 Eastern Standard Time (EST)? You need to account for the standard time difference. Eastern Standard Time is normally 1 hours behind Atlantic Standard Time. Whether you are coordinating between teams in Halifax and San Juan and New York and Toronto, 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 = 11:00 PM EST. The full 24-hour AST to EST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM AST = 2:00 PM EST.
| AST Time | EST Time |
|---|---|
| 12:00 AM (00:00) | 11:00 PM (23:00)-1 day |
| 1:00 AM (01:00) | 12:00 AM (00:00) |
| 2:00 AM (02:00) | 1:00 AM (01:00) |
| 3:00 AM (03:00) | 2:00 AM (02:00) |
| 4:00 AM (04:00) | 3:00 AM (03:00) |
| 5:00 AM (05:00) | 4:00 AM (04:00) |
| 6:00 AM (06:00) | 5:00 AM (05:00) |
| 7:00 AM (07:00) | 6:00 AM (06:00) |
| 8:00 AM (08:00) | 7:00 AM (07:00) |
| 9:00 AM (09:00) | 8:00 AM (08:00) |
| 10:00 AM (10:00) | 9:00 AM (09:00) |
| 11:00 AM (11:00) | 10:00 AM (10:00) |
| 12:00 PM (12:00) | 11:00 AM (11:00) |
| 1:00 PM (13:00) | 12:00 PM (12:00) |
| 2:00 PM (14:00) | 1:00 PM (13:00) |
| 3:00 PM (15:00) | 2:00 PM (14:00) |
| 4:00 PM (16:00) | 3:00 PM (15:00) |
| 5:00 PM (17:00) | 4:00 PM (16:00) |
| 6:00 PM (18:00) | 5:00 PM (17:00) |
| 7:00 PM (19:00) | 6:00 PM (18:00) |
| 8:00 PM (20:00) | 7:00 PM (19:00) |
| 9:00 PM (21:00) | 8:00 PM (20:00) |
| 10:00 PM (22:00) | 9:00 PM (21:00) |
| 11:00 PM (23:00) | 10:00 PM (22:00) |
Best time to call New York from Halifax
For most work calls, compare the normal business day in Halifax (AST) with the business day in New York (EST). AST commonly covers North America, Caribbean, while EST is mainly associated with North America, Caribbean, Central America.
⚠️ 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.
✅ The most practical overlap on 2026-07-05 is usually 10:00 AM - 5:00 PM AST, which corresponds to 9:00 AM - 4:00 PM EST. This window sits inside the typical AST workday (9:00 AM - 5:00 PM) and the EST workday (9:00 AM - 5:00 PM).
- DST Safety: AST or EST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- NYSE & NASDAQ: 09:30-16:00 local time in New York.
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Frequently Asked Questions
What is the time difference between AST and EST?
During standard time, Eastern Standard Time is 1 hours behind 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.
Is EST the same as Eastern Time (ET)?
Not exactly. 'Eastern Time' (ET) is a broad geographical term. EST is the specific UTC-05:00 offset used in winter, while EDT (Eastern Daylight Time) is the UTC-04:00 offset used during summer.
Does Florida use EST?
Most of Florida is in the Eastern Time Zone. However, the western part of the Florida Panhandle operates on Central Time (CST/CDT).