AST to PET
-1hAST
ASTSOURCEPET
PETGreen rows indicate typical business hours (9 AM - 5 PM)
AST and PET on the World Map
The map below highlights the AST (Atlantic Standard Time) and PET (Peru 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.
PET – Peru Time
UTC-05:00Peru Time (PET) is the standard time for Peru, 5 hours behind UTC.
- •Peru does not observe daylight saving time.
- •PET is the same offset as EST (UTC-05:00).
- •Lima is the 5th largest city in the Americas.
AST to PET Time Difference – Complete Guide
AST runs on Atlantic Standard Time (AST) at UTC-04:00. PET runs on Peru Time (PET) at UTC-05:00. That puts AST 1 hour behind PET — a difference of -1h at the current offsets.
In practice, when it is 9:00 AM in AST it is 8:00 AM in PET. Midnight in AST is 11:00 PM in PET. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to PET time conversion table
| AST (AST) | PET (PET) | Day |
|---|---|---|
| 12:00 AM | 11:00 PM | previous day |
| 6:00 AM | 5:00 AM | same day |
| 7:00 AM | 6:00 AM | same day |
| 8:00 AM | 7:00 AM | same day |
| 9:00 AM | 8:00 AM | same day |
| 12:00 PM | 11:00 AM | same day |
| 3:00 PM | 2:00 PM | same day |
| 5:00 PM | 4:00 PM | same day |
| 6:00 PM | 5:00 PM | same day |
| 9:00 PM | 8:00 PM | same day |
Why people convert AST to PET time
- Scheduling a call from AST to PET: a 10:00 AM start in AST lands at 9:00 AM in PET, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and PET are inside the 9-to-5 working day between 10:00 AM and 5:00 PM AST time (9:00 AM–4:00 PM PET). That is roughly 7 hours of usable overlap.
- Booking travel or deliveries: tracking PET local time against AST keeps pickup windows and arrival estimates honest across the -1h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a -1h gap is not.
- Block 10:00 AM–5:00 PM AST as the recurring meeting window if you work primarily from AST and need PET 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 PET (Peru Time)
Peru Time (PET) is the time zone used throughout Peru. Peru does not observe daylight saving time. PET shares the same offset as EST (UTC-05:00). Lima, the capital, is the economic center of Peru.
Best time to call between AST and PET
Both AST and PET sit inside the 9 AM – 5 PM working day between 10:00 AM–5:00 PM AST, which is 9:00 AM–4:00 PM PET. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and PET share 7 hours of working-hours overlap (10:00 AM–5:00 PM AST), so scheduling a live meeting is straightforward.
AST is 1 hour behind PET (AST UTC-04:00 → PET UTC-05:00). The shared working window is 10:00 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
PET
Does not observe DST
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 PET?
AST (AST, UTC-04:00) is 1 hour behind PET (PET, UTC-05:00). The gap is currently -1h.
How do I convert AST time to PET time?
Add -1h to AST local time. For example, 9:00 AM in AST is 8:00 AM in PET.
What time is it in PET right now?
PET uses PET at UTC-05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h offset from AST.
What is the best time to call PET from AST?
Call between 10:00 AM and 5:00 PM AST — that maps to 9:00 AM–4:00 PM PET and keeps both parties inside the working day.
Which is behind, AST or PET?
AST is 1 hour behind PET. When it is 12:00 PM in AST it is 11:00 AM in PET.
Does daylight saving time affect the AST–PET difference?
Neither zone observes daylight saving time, so the -1h offset between AST and PET 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 PET?
Not normally. The -1h gap only pushes the date over the previous day.
What is the time difference between AST and PET?
PET is -1h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is PET in?
PET 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 PET timezone?
Major cities in the PET timezone include Lima, Arequipa, Trujillo, Cusco, Callao.
What is the UTC offset for PET?
Peru Time (PET) is at UTC-05:00.
What should I know about the PET timezone?
Peru does not observe daylight saving time. PET is the same offset as EST (UTC-05:00).
When is it midnight in AST, what time is it in PET?
When it is 12:00 AM (midnight) in AST (AST), it is -1h later in PET (PET).
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See every conversion from AST →·See every conversion from PET →