AST to CLT
+0hAST
ASTSOURCECLT
CLTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and CLT on the World Map
The map below highlights the AST (Atlantic Standard Time) and CLT (Chile 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.
CLT – Chile Standard Time
UTC-04:00Chile Standard Time (CLT) is the time zone for continental Chile, 4 hours behind UTC.
- •Chile observes daylight saving time, switching to CLST (UTC-03:00) in summer.
- •Santiago is the largest city in Chile with over 6 million in the metro area.
- •Chile spans over 4,300 km from north to south but uses one timezone.
AST to CLT Time Difference – Complete Guide
AST runs on Atlantic Standard Time (AST) at UTC-04:00. CLT runs on Chile Standard Time (CLT) at UTC-04:00. That puts AST no time difference CLT — a difference of +0h at the current offsets.
In practice, when it is 9:00 AM in AST it is 9:00 AM in CLT. Midnight in AST is 12:00 AM in CLT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to CLT time conversion table
| AST (AST) | CLT (CLT) | 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 CLT time
- Scheduling a call from AST to CLT: a 10:00 AM start in AST lands at 10:00 AM in CLT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and CLT are inside the 9-to-5 working day between 9:00 AM and 5:00 PM AST time (9:00 AM–5:00 PM CLT). That is roughly 8 hours of usable overlap.
- Coordinating a AST-based team with CLT 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 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 CLT 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 CLT (Chile Standard Time)
Chile Standard Time (CLT) is the standard time in Chile. During summer months (October to March), Chile switches to Chile Summer Time (CLST, UTC-03:00). Chile is the longest north-south country in the world.
Best time to call between AST and CLT
Both AST and CLT 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 CLT. That gives roughly 8 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and CLT 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 CLT (AST UTC-04:00 → CLT 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
CLT
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Apr 4, 2027
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 CLT?
AST (AST, UTC-04:00) is no time difference CLT (CLT, UTC-04:00). The gap is currently +0h.
How do I convert AST time to CLT time?
Add +0h to AST local time. For example, 9:00 AM in AST is 9:00 AM in CLT.
What time is it in CLT right now?
CLT uses CLT 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 CLT from AST?
Call between 9:00 AM and 5:00 PM AST — that maps to 9:00 AM–5:00 PM CLT and keeps both parties inside the working day.
Which is ahead, AST or CLT?
AST and CLT are currently on the same clock.
Does daylight saving time affect the AST–CLT difference?
Neither zone observes daylight saving time, so the +0h offset between AST and CLT 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 CLT?
CLT is +0h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is CLT in?
CLT 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 CLT timezone?
Major cities in the CLT timezone include Santiago, Valparaíso, Concepción, Viña del Mar, Antofagasta.
What is the UTC offset for CLT?
Chile Standard Time (CLT) is at UTC-04:00. During daylight saving time, it shifts to CLST.
What should I know about the CLT timezone?
Chile observes daylight saving time, switching to CLST (UTC-03:00) in summer. Santiago is the largest city in Chile with over 6 million in the metro area.
When is it midnight in AST, what time is it in CLT?
When it is 12:00 AM (midnight) in AST (AST), it is +0h later in CLT (CLT).
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See every conversion from AST →·See every conversion from CLT →