Lisbon to AST
-5hLisbon
WESTSOURCEAST
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
WEST and AST on the World Map
The map below highlights the WEST (Western European Time) and AST (Atlantic Standard Time) timezone regions across the globe.
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.
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.
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.
Lisbon to AST Time Difference – Complete Guide
Lisbon runs on Western European Summer Time (WEST) at UTC+01:00, currently observing daylight saving time. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts Lisbon 5 hours behind AST — a difference of -5h at the current offsets.
In practice, when it is 9:00 AM in Lisbon it is 4:00 AM in AST. Midnight in Lisbon is 7:00 PM in AST.Lisbon observes daylight saving time while AST does not, so the gap narrows or widens by an hour part of the year.
Lisbon to AST time conversion table
| Lisbon (WEST) | AST (AST) | Day |
|---|---|---|
| 12:00 AM | 7:00 PM | previous day |
| 6:00 AM | 1:00 AM | same day |
| 7:00 AM | 2:00 AM | same day |
| 8:00 AM | 3:00 AM | same day |
| 9:00 AM | 4:00 AM | same day |
| 12:00 PM | 7:00 AM | same day |
| 3:00 PM | 10:00 AM | same day |
| 5:00 PM | 12:00 PM | same day |
| 6:00 PM | 1:00 PM | same day |
| 9:00 PM | 4:00 PM | same day |
Why people convert Lisbon to AST time
- Scheduling a call from Lisbon to AST: a 10:00 AM start in Lisbon lands at 5:00 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Lisbon and AST are inside the 9-to-5 working day between 2:00 PM and 5:00 PM WEST time (9:00 AM–12:00 PM AST). That is roughly 3 hours of usable overlap.
- Watching a live event or market open: Lisbon viewers need 4:00 AM in AST to catch a 9:00 AM start there, and 5:00 AM if the event is anchored to Lisbon.
- Always state the zone abbreviation, not just the hour. "3:00 PM WEST" is unambiguous; "3 PM" across a -5h gap is not.
- Block 2:00 PM–5:00 PM WEST as the recurring meeting window if you work primarily from Lisbon and need AST colleagues present.
- Lisbon: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the -5h gap.
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).
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 Lisbon and AST
Both Lisbon and AST sit inside the 9 AM – 5 PM working day between 2:00 PM–5:00 PM WEST, which is 9:00 AM–12:00 PM AST. That gives roughly 3 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Lisbon and AST overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
Lisbon is 5 hours behind AST (WEST UTC+01:00 → AST UTC-04:00). The shared working window is 2:00 PM–5:00 PM WEST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Lisbon
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 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 Lisbon and AST?
Lisbon (WEST, UTC+01:00) is 5 hours behind AST (AST, UTC-04:00). The gap is currently -5h.
How do I convert Lisbon time to AST time?
Add -5h to Lisbon local time. For example, 9:00 AM in Lisbon is 4:00 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 -5h offset from Lisbon.
What is the best time to call AST from Lisbon?
Call between 2:00 PM and 5:00 PM WEST — that maps to 9:00 AM–12:00 PM AST and keeps both parties inside the working day.
Which is behind, Lisbon or AST?
Lisbon is 5 hours behind AST. When it is 12:00 PM in Lisbon it is 7:00 AM in AST.
Do Lisbon and AST use different time zones?
Lisbon (Portugal) uses WEST at UTC+01:00, while AST uses AST at UTC-04:00. The IANA identifiers are Europe/Lisbon and America/Halifax.
Does daylight saving time affect the Lisbon–AST 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 Lisbon's time zone?
WEST also covers Lisbon, Porto, Casablanca, Las Palmas, Funchal, Rabat.
Which countries use WEST, Lisbon's zone?
WEST is used in Portugal, Spain (Canary Islands), Morocco, Western Sahara.
Is there a day difference between Lisbon and AST?
Not normally. The -5h gap only pushes the date over the previous day.
What is the time difference between Lisbon and AST?
AST is -5h from Lisbon.
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 timezone is AST in?
AST operates on its local timezone.
What are the business hours in Lisbon?
Standard business hours in Lisbon are 9:00 AM - 6:00 PM WET.
Which countries use WET (Western European Time)?
WET is used in Portugal, Spain (Canary Islands), Morocco, Western Sahara.
Does WET observe daylight saving time?
Yes, WET switches to WEST during summer months.
What are some interesting facts about WET?
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).
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 Lisbon, what time is it in AST?
When it is 12:00 AM (midnight) in Lisbon (WET), it is -5h later in AST (AST).
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