EDT to AST
+0hEDT
EDTSOURCEAST
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
EDT and AST on the World Map
The map below highlights the EDT (Eastern Daylight Time) and AST (Atlantic Standard Time) timezone regions across the globe.
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.
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.
Comparing Time Zones: EDT and AST
EDT runs on Eastern Daylight Time (EDT) at UTC-04:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts EDT no time difference AST — a difference of +0h at the current offsets.
In practice, when it is 9:00 AM in EDT it is 9:00 AM in AST. Midnight in EDT is 12:00 AM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
EDT to AST time conversion table
| EDT (EDT) | AST (AST) | 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 EDT to AST time
- Scheduling a call from EDT to AST: a 10:00 AM start in EDT lands at 10:00 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both EDT and AST are inside the 9-to-5 working day between 9:00 AM and 5:00 PM EDT time (9:00 AM–5:00 PM AST). That is roughly 8 hours of usable overlap.
- Coordinating a EDT-based team with AST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM EDT" is unambiguous; "3 PM" across a +0h gap is not.
- Block 9:00 AM–5:00 PM EDT as the recurring meeting window if you work primarily from EDT and need AST colleagues present.
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.
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.
Best time to call between EDT and AST
Both EDT and AST sit inside the 9 AM – 5 PM working day between 9:00 AM–5:00 PM EDT, which is 9:00 AM–5:00 PM AST. That gives roughly 8 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
EDT and AST share 8 hours of working-hours overlap (9:00 AM–5:00 PM EDT), so scheduling a live meeting is straightforward.
EDT is no time difference AST (EDT UTC-04:00 → AST UTC-04:00). The shared working window is 9:00 AM–5:00 PM EDT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
EDT
☀ Currently in DST
Standard: UTC-05:00 · DST: UTC-04:00
Clocks fall back on Sun, Nov 1, 2026
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
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 EDT and AST?
EDT (EDT, UTC-04:00) is no time difference AST (AST, UTC-04:00). The gap is currently +0h.
How do I convert EDT time to AST time?
Add +0h to EDT local time. For example, 9:00 AM in EDT is 9:00 AM in AST.
What time is it in AST right now?
AST uses AST 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 EDT.
What is the best time to call AST from EDT?
Call between 9:00 AM and 5:00 PM EDT — that maps to 9:00 AM–5:00 PM AST and keeps both parties inside the working day.
Which is ahead, EDT or AST?
EDT and AST are currently on the same clock.
Does daylight saving time affect the EDT–AST difference?
Neither zone observes daylight saving time, so the +0h offset between EDT and AST is fixed all year.
Which other cities share EDT's time zone?
EDT also covers New York City, Washington D.C., Toronto, Miami, Philadelphia, Atlanta, Boston, Montreal.
Which countries use EDT, EDT's zone?
EDT is used in United States (Eastern), Canada (Ontario, Quebec), Bahamas, Haiti, Turks and Caicos.
What is the time difference between EDT and AST?
AST is +0h from EDT.
What timezone is EDT in?
EDT operates on its local timezone.
What timezone is AST in?
AST operates on its local timezone.
Which countries use EDT (Eastern Daylight Time)?
EDT is used in United States (Eastern), Canada (Ontario, Quebec), Bahamas, Haiti, Turks and Caicos.
Does EDT observe daylight saving time?
Yes, EDT switches to EST during summer months.
What are some interesting facts about EDT?
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).
Which cities are in the AST timezone?
Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
What is the UTC offset for AST?
Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.
What should I know about the AST timezone?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
When is it midnight in EDT, what time is it in AST?
When it is 12:00 AM (midnight) in EDT (EDT), it is +0h later in AST (AST).
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See every conversion from EDT →·See every conversion from AST →