CET to AST Converter
Need to convert Central European Time to Atlantic Standard Time? AST is 5 hours behind CET. Edit the time or date below and the AST result updates live.
Daylight saving notes
In the European Union and the UK, summer time runs from the last Sunday in March to the last Sunday in October. That affects Central European Time (CET).
In the United States and Canada, daylight saving time runs from the second Sunday in March to the first Sunday in November. That affects Atlantic Standard Time (AST).
CET to AST conversion chart
For example, a 9:00 AM CET meeting takes place at 4:00 AM AST. Concretely, when Paris (CET) and Halifax (AST) set up a call, aST is 5 hours behind CET.
| CET time | AST time |
|---|---|
| 12:00 AM | 7:00 PM−1 day |
| 1:00 AM | 8:00 PM−1 day |
| 2:00 AM | 9:00 PM−1 day |
| 3:00 AM | 10:00 PM−1 day |
| 4:00 AM | 11:00 PM−1 day |
| 5:00 AM | 12:00 AM |
| 6:00 AM | 1:00 AM |
| 7:00 AM | 2:00 AM |
| 8:00 AM | 3:00 AM |
| 9:00 AM | 4:00 AM |
| 10:00 AM | 5:00 AM |
| 11:00 AM | 6:00 AM |
| 12:00 PM | 7:00 AM |
| 1:00 PM | 8:00 AM |
| 2:00 PM | 9:00 AM |
| 3:00 PM | 10:00 AM |
| 4:00 PM | 11:00 AM |
| 5:00 PM | 12:00 PM |
| 6:00 PM | 1:00 PM |
| 7:00 PM | 2:00 PM |
| 8:00 PM | 3:00 PM |
| 9:00 PM | 4:00 PM |
| 10:00 PM | 5:00 PM |
| 11:00 PM | 6:00 PM |
This chart uses the fixed CET and AST offsets; the live converter above follows current daylight saving.
Convert CET to AST Time Zone
Below are the answers people search for most when converting Central European Time (CET) to Atlantic Standard Time (AST).
How do I convert CET to AST?
It takes three quick steps:
- Click the CET field on the left and pick the time you want to convert.
- The matching AST time updates on the right automatically — there’s no button to press.
- Need a different day? Click the date field and the result follows, rolling over if it crosses midnight.
What is the time difference between CET and AST?
AST is 5 hours behind CET. In everyday terms, once you know the time on one side you just subtract 5 hours to get the other — so a call between Paris and Halifax is always 5 hours apart.
What's the current time in AST?
Right now the time in Atlantic Standard Time (AST) is Monday, June 29, 2026 · 1:53:58 PM. It ticks every second, so you’re always looking at the live AST clock.
And what time is it in CET?
And in Central European Time (CET), it’s currently Monday, June 29, 2026 · 6:53:58 PM. Compare the two and the 5 hours gap is easy to see.
What's the best time for a CET–AST call?
For example, a 9:00 AM CET meeting takes place at 4:00 AM AST. The trick is to aim for a slot that lands inside normal working hours on both sides. Once you’ve found a time, hit Share on the converter to copy a link with the time built in — easy to send to a colleague. Juggling three or more zones? The meeting planner highlights the hours that overlap for everyone.
Does daylight saving time change the CET–AST difference?
The labels CET and AST are fixed offsets, so the result on this page is always exact. Both regions move their clocks for daylight saving on roughly the same weekends, so the 5 hours gap usually holds steady right through the year.
How accurate is this CET to AST conversion?
We don’t guess. CET and AST times are worked out from the official IANA time zone database, the trusted standard that operating systems use worldwide. Because daylight-saving rules and regional offsets do change over time, we track those updates rather than relying on a fixed number — which is exactly where many converters slip up.
Convert CET to other time zones
- UTC Coordinated Universal Time
- GMT Greenwich Mean Time
- EST Eastern Standard Time
- EDT Eastern Daylight Time
- CST Central Standard Time
- CDT Central Daylight Time
- MST Mountain Standard Time
- MDT Mountain Daylight Time
- PST Pacific Standard Time
- PDT Pacific Daylight Time
- AKST Alaska Standard Time
- AKDT Alaska Daylight Time
- HST Hawaii Standard Time
- AST Atlantic Standard Time
- ADT Atlantic Daylight Time
- NST Newfoundland Standard Time
- NDT Newfoundland Daylight Time
- BRT Brasília Time
- ART Argentina Time
- WET Western European Time
- WEST Western European Summer Time
- CEST Central European Summer Time
- EET Eastern European Time
- EEST Eastern European Summer Time
- BST British Summer Time
- IST Irish Standard Time
- MSK Moscow Standard Time
- TRT Turkey Time
- WAT West Africa Time
- CAT Central Africa Time
- EAT East Africa Time
- SAST South Africa Standard Time
- GST Gulf Standard Time
- IST Israel Standard Time
- IDT Israel Daylight Time
- IST India Standard Time
- PKT Pakistan Standard Time
- BDT Bangladesh Standard Time
- ICT Indochina Time
- WIB Western Indonesian Time
- WITA Central Indonesian Time
- WIT Eastern Indonesian Time
- CST China Standard Time
- HKT Hong Kong Time
- SGT Singapore Time
- PHT Philippine Time
- JST Japan Standard Time
- KST Korea Standard Time
- AWST Australian Western Standard Time
- ACST Australian Central Standard Time
- ACDT Australian Central Daylight Time
- AEST Australian Eastern Standard Time
- AEDT Australian Eastern Daylight Time
- NZST New Zealand Standard Time
- NZDT New Zealand Daylight Time
Convert to AST from other time zones
- UTC Coordinated Universal Time
- GMT Greenwich Mean Time
- EST Eastern Standard Time
- EDT Eastern Daylight Time
- CST Central Standard Time
- CDT Central Daylight Time
- MST Mountain Standard Time
- MDT Mountain Daylight Time
- PST Pacific Standard Time
- PDT Pacific Daylight Time
- AKST Alaska Standard Time
- AKDT Alaska Daylight Time
- HST Hawaii Standard Time
- ADT Atlantic Daylight Time
- NST Newfoundland Standard Time
- NDT Newfoundland Daylight Time
- BRT Brasília Time
- ART Argentina Time
- WET Western European Time
- WEST Western European Summer Time
- CET Central European Time
- CEST Central European Summer Time
- EET Eastern European Time
- EEST Eastern European Summer Time
- BST British Summer Time
- IST Irish Standard Time
- MSK Moscow Standard Time
- TRT Turkey Time
- WAT West Africa Time
- CAT Central Africa Time
- EAT East Africa Time
- SAST South Africa Standard Time
- GST Gulf Standard Time
- IST Israel Standard Time
- IDT Israel Daylight Time
- IST India Standard Time
- PKT Pakistan Standard Time
- BDT Bangladesh Standard Time
- ICT Indochina Time
- WIB Western Indonesian Time
- WITA Central Indonesian Time
- WIT Eastern Indonesian Time
- CST China Standard Time
- HKT Hong Kong Time
- SGT Singapore Time
- PHT Philippine Time
- JST Japan Standard Time
- KST Korea Standard Time
- AWST Australian Western Standard Time
- ACST Australian Central Standard Time
- ACDT Australian Central Daylight Time
- AEST Australian Eastern Standard Time
- AEDT Australian Eastern Daylight Time
- NZST New Zealand Standard Time
- NZDT New Zealand Daylight Time
Frequently asked questions
How many hours behind CET is AST?
AST is 5 hours behind CET — a fixed 5 hours difference, since both are fixed-offset labels.
What time is it in AST when it's 12:00 PM CET?
When it's 12:00 PM (noon) CET, it's 7:00 AM AST.
Do CET or AST use daylight saving time?
Central European Time (CET) observes daylight saving, alternating with CEST; Atlantic Standard Time (AST) observes daylight saving, alternating with ADT.
Why might the real-world CET–AST difference change during the year?
The labels CET and AST are fixed offsets, so this converter is always exact. But Central European Time's region switches between standard and summer time, so for part of the year you may actually want CEST to AST. Always check which label a region is currently using before you schedule.