CET to AST Converter & Meeting Planner
Quick answer: 9:00 AM CET = 4:00 AM AST (fixed +01:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Central European Time (CET) and Atlantic Standard Time (AST)? You need to account for the standard time difference. Atlantic Standard Time is normally 5 hours behind Central European Time. Whether you are coordinating between teams in Paris and Berlin and Halifax and San Juan, 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 CET = 7:00 PM AST. The full 24-hour CET to AST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM CET = 10:00 AM AST.
| CET Time | AST Time |
|---|---|
| 12:00 AM (00:00) | 7:00 PM (19:00)-1 day |
| 1:00 AM (01:00) | 8:00 PM (20:00)-1 day |
| 2:00 AM (02:00) | 9:00 PM (21:00)-1 day |
| 3:00 AM (03:00) | 10:00 PM (22:00)-1 day |
| 4:00 AM (04:00) | 11:00 PM (23:00)-1 day |
| 5:00 AM (05:00) | 12:00 AM (00:00) |
| 6:00 AM (06:00) | 1:00 AM (01:00) |
| 7:00 AM (07:00) | 2:00 AM (02:00) |
| 8:00 AM (08:00) | 3:00 AM (03:00) |
| 9:00 AM (09:00) | 4:00 AM (04:00) |
| 10:00 AM (10:00) | 5:00 AM (05:00) |
| 11:00 AM (11:00) | 6:00 AM (06:00) |
| 12:00 PM (12:00) | 7:00 AM (07:00) |
| 1:00 PM (13:00) | 8:00 AM (08:00) |
| 2:00 PM (14:00) | 9:00 AM (09:00) |
| 3:00 PM (15:00) | 10:00 AM (10:00) |
| 4:00 PM (16:00) | 11:00 AM (11:00) |
| 5:00 PM (17:00) | 12:00 PM (12:00) |
| 6:00 PM (18:00) | 1:00 PM (13:00) |
| 7:00 PM (19:00) | 2:00 PM (14:00) |
| 8:00 PM (20:00) | 3:00 PM (15:00) |
| 9:00 PM (21:00) | 4:00 PM (16:00) |
| 10:00 PM (22:00) | 5:00 PM (17:00) |
| 11:00 PM (23:00) | 6:00 PM (18:00) |
Best time to call Halifax from Paris
For most work calls, compare the normal business day in Paris (CET) with the business day in Halifax (AST). CET commonly covers Europe, North Africa, while AST is mainly associated with North America, Caribbean.
⚠️ Note: 2026-07-05 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 2026-07-05 is usually 2:00 PM - 5:00 PM CET, which corresponds to 9:00 AM - 12:00 PM AST. This window sits inside the typical CET workday (9:00 AM - 5:00 PM) and the AST workday (9:00 AM - 5:00 PM).
- DST Safety: CET or AST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Frankfurt Stock Exchange: 09:00-17:30 local time in Frankfurt.
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Frequently Asked Questions
What is the time difference between CET and AST?
During standard time, Atlantic Standard Time is 5 hours behind Central European Time.
What is the difference between CET and CEST?
CET (Central European Time) is the standard winter offset at UTC+1, observed from the last Sunday in October through the last Sunday in March. CEST (Central European Summer Time) is the daylight saving offset at UTC+2, applied each summer when European clocks advance one hour.
Does Spain use Central European Time?
Yes, mainland Spain observes CET (UTC+1) in winter and CEST (UTC+2) in summer, placing it on the same clock as Germany and France. This makes Spain one hour ahead of the United Kingdom despite sharing a much closer geographic longitude to Portugal, which uses GMT.
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.