AST to Lisbon
+5hAST
ASTSOURCELisbon
WESTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and WEST on the World Map
The map below highlights the AST (Atlantic Standard Time) and WEST (Western European 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.
WET – Western European Time
UTC+00:00Western European Time (WET) is the time zone for Portugal, Morocco, and the Canary Islands, same as UTC+00:00.
- •Portugal is the only mainland European country in the WET time zone.
- •The Canary Islands are on WET despite being part of Spain (which uses CET).
- •WET is identical to GMT and UTC+00:00.
About Lisbon
WikipediaLisbon operates on Western European Time (WET/WEST), same as London. As Portugal's capital and an emerging tech hub, Lisbon bridges European and Atlantic time zones.
Lisbon has 300 days of sunshine per year and is a major startup hub in Europe.
Everything You Need to Know About AST and Lisbon Time
AST runs on Atlantic Standard Time (AST) at UTC-04:00. Lisbon runs on Western European Summer Time (WEST) at UTC+01:00, also currently on daylight saving time. That puts AST 5 hours ahead of Lisbon — a difference of +5h at the current offsets.
In practice, when it is 9:00 AM in AST it is 2:00 PM in Lisbon. Midnight in AST is 5:00 AM in Lisbon.Lisbon observes daylight saving time while AST does not, so the gap narrows or widens by an hour part of the year.
AST to Lisbon time conversion table
| AST (AST) | Lisbon (WEST) | Day |
|---|---|---|
| 12:00 AM | 5:00 AM | same day |
| 6:00 AM | 11:00 AM | same day |
| 7:00 AM | 12:00 PM | same day |
| 8:00 AM | 1:00 PM | same day |
| 9:00 AM | 2:00 PM | same day |
| 12:00 PM | 5:00 PM | same day |
| 3:00 PM | 8:00 PM | same day |
| 5:00 PM | 10:00 PM | same day |
| 6:00 PM | 11:00 PM | same day |
| 9:00 PM | 2:00 AM | next day |
Why people convert AST to Lisbon time
- Scheduling a call from AST to Lisbon: a 10:00 AM start in AST lands at 3:00 PM in Lisbon, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and Lisbon are inside the 9-to-5 working day between 9:00 AM and 12:00 PM AST time (2:00 PM–5:00 PM WEST). That is roughly 3 hours of usable overlap.
- Booking travel or deliveries: tracking Lisbon local time against AST keeps pickup windows and arrival estimates honest across the +5h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +5h gap is not.
- Block 9:00 AM–12:00 PM AST as the recurring meeting window if you work primarily from AST and need Lisbon colleagues present.
- Lisbon: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
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 WET (Western European Time)
Western European Time (WET) is used in Portugal, the Canary Islands (Spain), Morocco, and several other locations. It is equivalent to GMT/UTC. During summer, Portugal and the Canary Islands switch to WEST (Western European Summer Time, UTC+01:00).
Best time to call between AST and Lisbon
Both AST and Lisbon sit inside the 9 AM – 5 PM working day between 9:00 AM–12:00 PM AST, which is 2:00 PM–5:00 PM WEST. That gives roughly 3 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and Lisbon overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
AST is 5 hours ahead of Lisbon (AST UTC-04:00 → WEST UTC+01:00). The shared working window is 9:00 AM–12:00 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
Lisbon
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 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 Lisbon?
AST (AST, UTC-04:00) is 5 hours ahead of Lisbon (WEST, UTC+01:00). The gap is currently +5h.
How do I convert AST time to Lisbon time?
Add +5h to AST local time. For example, 9:00 AM in AST is 2:00 PM in Lisbon.
What time is it in Lisbon right now?
Lisbon uses WEST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +5h offset from AST.
What is the best time to call Lisbon from AST?
Call between 9:00 AM and 12:00 PM AST — that maps to 2:00 PM–5:00 PM WEST and keeps both parties inside the working day.
Which is ahead, AST or Lisbon?
AST is 5 hours ahead of Lisbon. When it is 12:00 PM in AST it is 5:00 PM in Lisbon.
Do AST and Lisbon use different time zones?
AST uses AST at UTC-04:00, while Lisbon (Portugal) uses WEST at UTC+01:00. The IANA identifiers are America/Halifax and Europe/Lisbon.
Does daylight saving time affect the AST–Lisbon difference?
Yes at the moment: Lisbon is on daylight saving time and AST is not, so the +5h gap shifts by an hour when exactly one of them changes clocks.
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 Lisbon?
Not normally. The +5h gap only pushes the date over for late-evening times.
What is the time difference between AST and Lisbon?
Lisbon is +5h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is Lisbon in?
Lisbon operates on Western European Time (WET/WEST), same as London. As Portugal's capital and an emerging tech hub, Lisbon bridges European and Atlantic time zones.
What are the business hours in Lisbon?
Standard business hours in Lisbon are 9:00 AM - 6:00 PM WET.
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 WET timezone?
Major cities in the WET timezone include Lisbon, Porto, Casablanca, Las Palmas, Funchal, Rabat.
What is the UTC offset for WET?
Western European Time (WET) is at UTC+00:00. During daylight saving time, it shifts to WEST.
What should I know about the WET timezone?
Portugal is the only mainland European country in the WET time zone. The Canary Islands are on WET despite being part of Spain (which uses CET).
When is it midnight in AST, what time is it in Lisbon?
When it is 12:00 AM (midnight) in AST (AST), it is +5h later in Lisbon (WET).
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See every conversion from AST →·See every conversion from Lisbon →