What does AST stand for?

AST stands for Atlantic Standard Time. It is UTC-4 and is used in: Canada (Atlantic), Caribbean.

What time is it in AST right now?

The live clock above shows the current time in AST (UTC-4). It updates every second using your browser's built-in time API.

Which countries or regions use AST?

AST is used in the following regions: Canada (Atlantic), Caribbean. Note that some regions may use a different abbreviation for the same offset during Daylight Saving Time.

Is AST the same as UTC-4?

Yes. AST is the standard abbreviation for the UTC-4 offset. However, the same UTC offset can have multiple abbreviations depending on the region and whether Daylight Saving Time is in effect.

How do I convert AST time to my local time?

Use the Compare tool on HOUR — add AST and your city side by side to see the exact difference instantly. You can also use the Time Simulator on the home page to drag through any hour and see both times simultaneously.

Does AST observe Daylight Saving Time?

Standard time zone abbreviations like AST refer to a fixed offset (UTC-4). If a region using AST observes DST, it switches to a different abbreviation during summer — for example, EST switches to EDT. The clock on each region's page always reflects the correct current offset.

What is the difference between AST and similar time zones?

Time zone abbreviations are not always globally unique — the same letters can refer to different offsets in different regions. AST on this page specifically refers to Atlantic Standard Time (UTC-4). Always verify the UTC offset when scheduling across regions to avoid confusion.

Can I schedule a meeting across AST and other time zones?

Yes. Use the Compare page on HOUR — add AST and any other cities or time zones. The side-by-side view shows all local times simultaneously, making it easy to find a meeting slot that works for everyone.

How accurate is the AST clock on this page?

The clock uses your browser's built-in Intl.DateTimeFormat API, which reads directly from your device's system clock and applies the correct IANA timezone offset. There is no server delay — the time is always accurate to the second.

ASTUTC-4

Atlantic Standard Time

Canada (Atlantic) · Caribbean

vs. your location

-12h from your location

AST|Standard Time Zone

Daytime

AST Time

--:--:--

Abbreviation

AST

UTC Offset

UTC-4

Used in

Canada (Atlantic) · Caribbean

Related Time Zones

View all 44 →

EST

UTC-5

→

EDT

UTC-4

→

CDT

UTC-5

→

BRT

UTC-3

→

ART

UTC-3

→

Browse All 44 Time Zone Abbreviations →

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AST Time — Atlantic Standard Time

AST stands for Atlantic Standard Time and is currently UTC-4. This page shows the live current time for the AST time zone, used across Canada (Atlantic), Caribbean.

How to Use This Page

1
Check the live AST clock
The clock updates every second and always shows the current time in the AST (Atlantic Standard Time, UTC-4) time zone.
2
Understand the UTC offset
AST is UTC-4 — meaning it is that many hours ahead or behind Coordinated Universal Time (UTC).
3
See which regions use AST
The regions listed on this page all share the AST time zone. Tap any region to open its dedicated clock page.
4
Compare with your location
Open the Compare page and add AST to see your local time and AST time side by side.