AST to EDT
+0hAST
ASTSOURCEEDT
EDTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and EDT on the World Map
The map below highlights the AST (Atlantic Standard Time) and EDT (Eastern Daylight 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.
EDT – Eastern Daylight Time
UTC-04:00Eastern Daylight Time (EDT) is the daylight saving time observed in the Eastern Time Zone, 4 hours behind UTC.
- •EDT is observed from the second Sunday of March to the first Sunday of November.
- •During EDT, the US East Coast is only 4 hours behind London (instead of 5).
- •Not all EST locations switch to EDT – Panama and Jamaica stay on EST year-round.
Comparing Time Zones: AST and EDT
AST runs on Atlantic Standard Time (AST) at UTC-04:00. EDT runs on Eastern Daylight Time (EDT) at UTC-04:00. That puts AST no time difference EDT — a difference of +0h at the current offsets.
In practice, when it is 9:00 AM in AST it is 9:00 AM in EDT. Midnight in AST is 12:00 AM in EDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to EDT time conversion table
| AST (AST) | EDT (EDT) | Day |
|---|---|---|
| 12:00 AM | 12:00 AM | same day |
| 6:00 AM | 6:00 AM | same day |
| 7:00 AM | 7:00 AM | same day |
| 8:00 AM | 8:00 AM | same day |
| 9:00 AM | 9:00 AM | same day |
| 12:00 PM | 12:00 PM | same day |
| 3:00 PM | 3:00 PM | same day |
| 5:00 PM | 5:00 PM | same day |
| 6:00 PM | 6:00 PM | same day |
| 9:00 PM | 9:00 PM | same day |
Why people convert AST to EDT time
- Scheduling a call from AST to EDT: a 10:00 AM start in AST lands at 10:00 AM in EDT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and EDT are inside the 9-to-5 working day between 9:00 AM and 5:00 PM AST time (9:00 AM–5:00 PM EDT). That is roughly 8 hours of usable overlap.
- Watching a live event or market open: AST viewers need 9:00 AM in EDT to catch a 9:00 AM start there, and 12:00 AM if the event is anchored to AST.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +0h gap is not.
- Block 9:00 AM–5:00 PM AST as the recurring meeting window if you work primarily from AST and need EDT colleagues present.
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 EDT (Eastern Daylight Time)
Eastern Daylight Time (EDT) is used during the summer months (second Sunday of March to the first Sunday of November) in the Eastern Time Zone. During EDT, clocks are advanced by one hour to take advantage of longer daylight hours. Not all locations in the Eastern Time Zone observe DST – Panama, Jamaica, and most of the Caribbean remain on EST year-round.
Best time to call between AST and EDT
Both AST and EDT sit inside the 9 AM – 5 PM working day between 9:00 AM–5:00 PM AST, which is 9:00 AM–5:00 PM EDT. That gives roughly 8 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and EDT share 8 hours of working-hours overlap (9:00 AM–5:00 PM AST), so scheduling a live meeting is straightforward.
AST is no time difference EDT (AST UTC-04:00 → EDT UTC-04:00). The shared working window is 9:00 AM–5:00 PM AST. 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
EDT
☀ Currently in DST
Standard: UTC-05:00 · DST: UTC-04:00
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 AST and EDT?
AST (AST, UTC-04:00) is no time difference EDT (EDT, UTC-04:00). The gap is currently +0h.
How do I convert AST time to EDT time?
Add +0h to AST local time. For example, 9:00 AM in AST is 9:00 AM in EDT.
What time is it in EDT right now?
EDT uses EDT at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +0h offset from AST.
What is the best time to call EDT from AST?
Call between 9:00 AM and 5:00 PM AST — that maps to 9:00 AM–5:00 PM EDT and keeps both parties inside the working day.
Which is ahead, AST or EDT?
AST and EDT are currently on the same clock.
Does daylight saving time affect the AST–EDT difference?
Neither zone observes daylight saving time, so the +0h offset between AST and EDT 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.
What is the time difference between AST and EDT?
EDT is +0h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is EDT in?
EDT 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 EDT timezone?
Major cities in the EDT timezone include New York City, Washington D.C., Toronto, Miami, Philadelphia, Atlanta, Boston, Montreal.
What is the UTC offset for EDT?
Eastern Daylight Time (EDT) is at UTC-04:00. During daylight saving time, it shifts to EST.
What should I know about the EDT timezone?
EDT is observed from the second Sunday of March to the first Sunday of November. During EDT, the US East Coast is only 4 hours behind London (instead of 5).
When is it midnight in AST, what time is it in EDT?
When it is 12:00 AM (midnight) in AST (AST), it is +0h later in EDT (EDT).
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See every conversion from AST →·See every conversion from EDT →