AST to WET Converter & Meeting Planner
Quick answer: 9:00 AM AST = 1:00 PM WET (fixed -04:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Atlantic Standard Time (AST) and Western European Time (WET)? You need to account for the standard time difference. Western European Time is normally 4 hours ahead of Atlantic Standard Time. Whether you are coordinating between teams in Halifax and San Juan and Lisbon and Las Palmas, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM AST = 4:00 AM WET. The full 24-hour AST to WET table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM AST = 7:00 PM WET.
| AST Time | WET Time |
|---|---|
| 12:00 AM (00:00) | 4:00 AM (04:00) |
| 1:00 AM (01:00) | 5:00 AM (05:00) |
| 2:00 AM (02:00) | 6:00 AM (06:00) |
| 3:00 AM (03:00) | 7:00 AM (07:00) |
| 4:00 AM (04:00) | 8:00 AM (08:00) |
| 5:00 AM (05:00) | 9:00 AM (09:00) |
| 6:00 AM (06:00) | 10:00 AM (10:00) |
| 7:00 AM (07:00) | 11:00 AM (11:00) |
| 8:00 AM (08:00) | 12:00 PM (12:00) |
| 9:00 AM (09:00) | 1:00 PM (13:00) |
| 10:00 AM (10:00) | 2:00 PM (14:00) |
| 11:00 AM (11:00) | 3:00 PM (15:00) |
| 12:00 PM (12:00) | 4:00 PM (16:00) |
| 1:00 PM (13:00) | 5:00 PM (17:00) |
| 2:00 PM (14:00) | 6:00 PM (18:00) |
| 3:00 PM (15:00) | 7:00 PM (19:00) |
| 4:00 PM (16:00) | 8:00 PM (20:00) |
| 5:00 PM (17:00) | 9:00 PM (21:00) |
| 6:00 PM (18:00) | 10:00 PM (22:00) |
| 7:00 PM (19:00) | 11:00 PM (23:00) |
| 8:00 PM (20:00) | 12:00 AM (00:00)+1 day |
| 9:00 PM (21:00) | 1:00 AM (01:00)+1 day |
| 10:00 PM (22:00) | 2:00 AM (02:00)+1 day |
| 11:00 PM (23:00) | 3:00 AM (03:00)+1 day |
Best time to call Lisbon from Halifax
For most work calls, compare the normal business day in Halifax (AST) with the business day in Lisbon (WET). AST commonly covers North America, Caribbean, while WET is mainly associated with Western Europe, Macaronesia.
⚠️ Note: 2026-07-04 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-04 is usually 9:00 AM - 2:00 PM AST, which corresponds to 1:00 PM - 6:00 PM WET. This window sits inside the typical AST workday (9:00 AM - 5:00 PM) and the WET workday (9:00 AM - 6:00 PM).
- DST Safety: AST or WET may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
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Frequently Asked Questions
What is the time difference between AST and WET?
During standard time, Western European Time is 4 hours ahead of Atlantic Standard Time.
Does the Caribbean observe Daylight Saving Time?
The vast majority of Caribbean nations and territories — including Puerto Rico, the Dominican Republic, the US Virgin Islands, Trinidad and Tobago, and Barbados — do not observe Daylight Saving Time and remain on AST (UTC-4) year-round. This means these territories share the same clock as Halifax only during the Atlantic Standard Time window in winter, diverging by one hour once Canada and Bermuda advance to ADT each spring.
What is the difference between AST and ADT?
AST (Atlantic Standard Time) is the standard winter offset at UTC-4:00, observed from the first Sunday in November through the second Sunday in March across all AST regions. ADT (Atlantic Daylight Time) is the summer offset at UTC-3:00, applied by Eastern Canadian provinces and Bermuda when they advance their clocks by one hour during Daylight Saving Time.
Is WET the same as GMT?
WET and GMT share the exact same UTC+0 standard offset, and both shift forward by one hour during summer under identical DST schedules, making them numerically interchangeable for any clock or calendar calculation. However, WET is the formal legal time zone designation used by Portugal, the Faroe Islands, and Spain's Canary Islands, while GMT is a historically-grounded designation tied specifically to the United Kingdom and its meridian at Greenwich.
Does Spain use Western European Time?
Mainland Spain operates on Central European Time (CET) at UTC+1, meaning cities like Madrid and Barcelona run one hour ahead of WET throughout the entire year. The Canary Islands are the exception: as a Spanish autonomous community, they officially observe WET, placing Las Palmas and Santa Cruz de Tenerife a full hour behind the Spanish mainland at all times.