WAT to AST
-5hWAT
WATSOURCEAST
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
WAT and AST on the World Map
The map below highlights the WAT (West Africa Time) and AST (Atlantic Standard Time) timezone regions across the globe.
WAT – West Africa Time
UTC+01:00West Africa Time (WAT) is the time zone for West and Central Africa, 1 hour ahead of UTC.
- •Lagos, Nigeria is the most populous city in Africa.
- •WAT is the same offset as CET (UTC+01:00).
- •Nigeria does not observe daylight saving time.
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.
Time Conversion Guide: WAT to AST
WAT runs on West Africa Time (WAT) at UTC+01:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts WAT 5 hours behind AST — a difference of -5h at the current offsets.
In practice, when it is 9:00 AM in WAT it is 4:00 AM in AST. Midnight in WAT is 7:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
WAT to AST time conversion table
| WAT (WAT) | 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 WAT to AST time
- Scheduling a call from WAT to AST: a 10:00 AM start in WAT lands at 5:00 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both WAT and AST are inside the 9-to-5 working day between 2:00 PM and 5:00 PM WAT time (9:00 AM–12:00 PM AST). That is roughly 3 hours of usable overlap.
- Booking travel or deliveries: tracking AST local time against WAT keeps pickup windows and arrival estimates honest across the -5h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM WAT" is unambiguous; "3 PM" across a -5h gap is not.
- Block 2:00 PM–5:00 PM WAT as the recurring meeting window if you work primarily from WAT and need AST colleagues present.
About WAT (West Africa Time)
West Africa Time (WAT) is used across much of West and Central Africa, including Nigeria, the most populous country in Africa. WAT does not observe daylight saving time and shares the same offset as Central European Time (CET).
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 WAT and AST
Both WAT and AST sit inside the 9 AM – 5 PM working day between 2:00 PM–5:00 PM WAT, 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
WAT and AST overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
WAT is 5 hours behind AST (WAT UTC+01:00 → AST UTC-04:00). The shared working window is 2:00 PM–5:00 PM WAT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
WAT
Does not observe DST
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 WAT and AST?
WAT (WAT, UTC+01:00) is 5 hours behind AST (AST, UTC-04:00). The gap is currently -5h.
How do I convert WAT time to AST time?
Add -5h to WAT local time. For example, 9:00 AM in WAT 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 WAT.
What is the best time to call AST from WAT?
Call between 2:00 PM and 5:00 PM WAT — that maps to 9:00 AM–12:00 PM AST and keeps both parties inside the working day.
Which is behind, WAT or AST?
WAT is 5 hours behind AST. When it is 12:00 PM in WAT it is 7:00 AM in AST.
Does daylight saving time affect the WAT–AST difference?
Neither zone observes daylight saving time, so the -5h offset between WAT and AST is fixed all year.
Which other cities share WAT's time zone?
WAT also covers Lagos, Abuja, Douala, Yaoundé, Luanda, Kinshasa, Brazzaville.
Which countries use WAT, WAT's zone?
WAT is used in Nigeria, Cameroon, Chad, Congo, Angola, Niger, Gabon, Equatorial Guinea.
Is there a day difference between WAT and AST?
Not normally. The -5h gap only pushes the date over the previous day.
What is the time difference between WAT and AST?
AST is -5h from WAT.
What timezone is WAT in?
WAT operates on its local timezone.
What timezone is AST in?
AST operates on its local timezone.
Which countries use WAT (West Africa Time)?
WAT is used in Nigeria, Cameroon, Chad, Congo, Angola, Niger, and 2 more countries.
Does WAT observe daylight saving time?
No, WAT does not observe daylight saving time and remains at UTC+01:00 year-round.
What are some interesting facts about WAT?
Lagos, Nigeria is the most populous city in Africa. WAT is the same offset as CET (UTC+01:00).
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 WAT, what time is it in AST?
When it is 12:00 AM (midnight) in WAT (WAT), it is -5h later in AST (AST).
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See every conversion from WAT →·See every conversion from AST →