WET to AST
-4hWET
WETSOURCEAST
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
WET and AST on the World Map
The map below highlights the WET (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.
Understanding the -4h Gap: WET vs AST
WET runs on Western European Time (WET) at UTC+00:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts WET 4 hours behind AST — a difference of -4h at the current offsets.
In practice, when it is 9:00 AM in WET it is 5:00 AM in AST. Midnight in WET is 8:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
WET to AST time conversion table
| WET (WET) | AST (AST) | Day |
|---|---|---|
| 12:00 AM | 8:00 PM | previous day |
| 6:00 AM | 2:00 AM | same day |
| 7:00 AM | 3:00 AM | same day |
| 8:00 AM | 4:00 AM | same day |
| 9:00 AM | 5:00 AM | same day |
| 12:00 PM | 8:00 AM | same day |
| 3:00 PM | 11:00 AM | same day |
| 5:00 PM | 1:00 PM | same day |
| 6:00 PM | 2:00 PM | same day |
| 9:00 PM | 5:00 PM | same day |
Why people convert WET to AST time
- Scheduling a call from WET to AST: a 10:00 AM start in WET lands at 6:00 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both WET and AST are inside the 9-to-5 working day between 1:00 PM and 5:00 PM WET time (9:00 AM–1:00 PM AST). That is roughly 4 hours of usable overlap.
- Watching a live event or market open: WET viewers need 5:00 AM in AST to catch a 9:00 AM start there, and 4:00 AM if the event is anchored to WET.
- Always state the zone abbreviation, not just the hour. "3:00 PM WET" is unambiguous; "3 PM" across a -4h gap is not.
- Block 1:00 PM–5:00 PM WET as the recurring meeting window if you work primarily from WET and need AST colleagues present.
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 WET and AST
Both WET and AST sit inside the 9 AM – 5 PM working day between 1:00 PM–5:00 PM WET, which is 9:00 AM–1:00 PM AST. That gives roughly 4 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
WET and AST overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
WET is 4 hours behind AST (WET UTC+00:00 → AST UTC-04:00). The shared working window is 1:00 PM–5:00 PM WET. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
WET
☀ 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 WET and AST?
WET (WET, UTC+00:00) is 4 hours behind AST (AST, UTC-04:00). The gap is currently -4h.
How do I convert WET time to AST time?
Add -4h to WET local time. For example, 9:00 AM in WET is 5:00 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 -4h offset from WET.
What is the best time to call AST from WET?
Call between 1:00 PM and 5:00 PM WET — that maps to 9:00 AM–1:00 PM AST and keeps both parties inside the working day.
Which is behind, WET or AST?
WET is 4 hours behind AST. When it is 12:00 PM in WET it is 8:00 AM in AST.
Does daylight saving time affect the WET–AST difference?
Neither zone observes daylight saving time, so the -4h offset between WET and AST is fixed all year.
Which other cities share WET's time zone?
WET also covers Lisbon, Porto, Casablanca, Las Palmas, Funchal, Rabat.
Which countries use WET, WET's zone?
WET is used in Portugal, Spain (Canary Islands), Morocco, Western Sahara.
Is there a day difference between WET and AST?
Not normally. The -4h gap only pushes the date over the previous day.
What is the time difference between WET and AST?
AST is -4h from WET.
What timezone is WET in?
WET operates on its local timezone.
What timezone is AST in?
AST operates on its local timezone.
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 WET, what time is it in AST?
When it is 12:00 AM (midnight) in WET (WET), it is -4h later in AST (AST).
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