AST to NST
+0h 30mAST
ASTSOURCENST
NSTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and NST on the World Map
The map below highlights the AST (Atlantic Standard Time) and NST (Newfoundland 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.
NST – Newfoundland Standard Time
UTC-03:30Newfoundland Standard Time (NST) is a unique half-hour offset time zone in Canada, 3.5 hours behind UTC.
- •NST is one of only a few half-hour offset time zones in the world.
- •Newfoundland joined Canada in 1949 and kept its unique time zone.
- •St. John's is the easternmost city in North America.
Comparing Time Zones: AST and NST
AST runs on Atlantic Standard Time (AST) at UTC-04:00. NST runs on Newfoundland Standard Time (NST) at UTC-03:30. That puts AST 30 minutes ahead of NST — a difference of +0h 30m at the current offsets.
In practice, when it is 9:00 AM in AST it is 9:30 AM in NST. Midnight in AST is 12:30 AM in NST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to NST time conversion table
| AST (AST) | NST (NST) | Day |
|---|---|---|
| 12:00 AM | 12:30 AM | same day |
| 6:00 AM | 6:30 AM | same day |
| 7:00 AM | 7:30 AM | same day |
| 8:00 AM | 8:30 AM | same day |
| 9:00 AM | 9:30 AM | same day |
| 12:00 PM | 12:30 PM | same day |
| 3:00 PM | 3:30 PM | same day |
| 5:00 PM | 5:30 PM | same day |
| 6:00 PM | 6:30 PM | same day |
| 9:00 PM | 9:30 PM | same day |
Why people convert AST to NST time
- Scheduling a call from AST to NST: a 10:00 AM start in AST lands at 10:30 AM in NST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and NST are inside the 9-to-5 working day between 9:00 AM and 4:30 PM AST time (9:30 AM–5:00 PM NST). That is roughly 7 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in AST is 8:30 PM in NST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +0h 30m gap is not.
- Block 9:00 AM–4:30 PM AST as the recurring meeting window if you work primarily from AST and need NST 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 NST (Newfoundland Standard Time)
Newfoundland Standard Time (NST) is one of the few half-hour offset time zones in the world. It covers the island of Newfoundland in Canada and is 30 minutes ahead of Atlantic Standard Time. This unique offset exists because Newfoundland was an independent country until 1949.
Best time to call between AST and NST
Both AST and NST sit inside the 9 AM – 5 PM working day between 9:00 AM–4:30 PM AST, which is 9:30 AM–5:00 PM NST. That gives roughly 7 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and NST share 7 hours of working-hours overlap (9:00 AM–4:30 PM AST), so scheduling a live meeting is straightforward.
AST is 30 minutes ahead of NST (AST UTC-04:00 → NST UTC-03:30). The shared working window is 9:00 AM–4:30 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
NST
☀ Currently in DST
Standard: UTC-03:30 · DST: UTC-02:30
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 NST?
AST (AST, UTC-04:00) is 30 minutes ahead of NST (NST, UTC-03:30). The gap is currently +0h 30m.
How do I convert AST time to NST time?
Add +0h 30m to AST local time. For example, 9:00 AM in AST is 9:30 AM in NST.
What time is it in NST right now?
NST uses NST at UTC-03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +0h 30m offset from AST.
What is the best time to call NST from AST?
Call between 9:00 AM and 4:30 PM AST — that maps to 9:30 AM–5:00 PM NST and keeps both parties inside the working day.
Which is ahead, AST or NST?
AST is 30 minutes ahead of NST. When it is 12:00 PM in AST it is 12:30 PM in NST.
Does daylight saving time affect the AST–NST difference?
Neither zone observes daylight saving time, so the +0h 30m offset between AST and NST 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 NST?
Not normally. The +0h 30m gap only pushes the date over for late-evening times.
What is the time difference between AST and NST?
NST is +0h 30m from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is NST in?
NST 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 NST timezone?
Major cities in the NST timezone include St. John's, Corner Brook, Mount Pearl.
What is the UTC offset for NST?
Newfoundland Standard Time (NST) is at UTC-03:30. During daylight saving time, it shifts to NDT.
What should I know about the NST timezone?
NST is one of only a few half-hour offset time zones in the world. Newfoundland joined Canada in 1949 and kept its unique time zone.
When is it midnight in AST, what time is it in NST?
When it is 12:00 AM (midnight) in AST (AST), it is +0h 30m later in NST (NST).
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See every conversion from AST →·See every conversion from NST →