AST Time Now — Atlantic Standard Time

AST (Atlantic Standard Time) is a fixed offset of UTC−4 — it never changes for daylight saving.

Live •Updates every second
UTC−4 Monday, June 22, 2026
08:15:57

Compare with

It is in AST (Atlantic Standard Time, UTC−4) right now. AST (Atlantic Standard Time) is a fixed offset of UTC−4 — it never changes for daylight saving.
Heads up

“AST” can mean more than one time zone

AST also stands for Arabia Standard Time (UTC+3), used in Saudi Arabia, Kuwait and Qatar. This page covers Atlantic Standard Time.

Daylight saving

Is it AST or ADT right now?

ADT (UTC−3) is in effect right now. Clocks fall back to AST (UTC−4) on November 1, 2026 — in 132 days.
Mar 8Nov 1
ADT · daylight (UTC−3) AST · standard (UTC−4) Today
Clock changes

AST / ADT daylight-saving dates

2026

↑ Forward Sunday, March 8 → ADT
↓ Back Sunday, November 1 → AST

2027

↑ Forward Sunday, March 14 → ADT
↓ Back Sunday, November 7 → AST

Clocks change at 2:00 AM local time. Dates shift by a week or so each year; these are computed live from the IANA time-zone database.

What the letters mean

AST, ADT and Atlantic Time

Standard time (winter)
AST — Atlantic Standard Time
UTC−4
Daylight time (summer)
ADT — Atlantic Daylight Time
UTC−3
When you're not sure
Write Atlantic Time — it refers to whichever of AST or ADT is currently in effect, so it's always correct.
Time differences

AST vs other time zones right now

UTC Coordinated Universal Time +4h → GMT Greenwich Mean Time +4h → EST Eastern Standard Time −1h → PST Pacific Standard Time −4h → CST Central Standard Time −2h → CET Central European Time +5h → IST India Standard Time +9:30 → SGT Singapore Time +12h →

Tap a row for the full conversion page with a 24-hour table and the best hours to schedule across both zones.

Reference

About AST

Full name
Atlantic Standard Time
UTC offset
UTC−4
Type
Standard time (fixed offset)
Daylight counterpart
ADT — Atlantic Daylight Time
Where it is used
Atlantic Canada in winter; Puerto Rico and most of the Caribbean year-round.

Regions on AST switch to ADT (UTC−3) during daylight saving time.

Cities on AST right now

San Juan

Convert AST to other time zones

AST → UTC AST → GMT AST → EST AST → PST AST → CST AST → CET AST → IST AST → SGT

Convert AST to major cities

AST → New York AST → London AST → Tokyo AST → Sydney AST → Los Angeles AST → Dubai AST → Singapore AST → Mumbai

Frequently asked questions

What does AST stand for?

AST stands for Atlantic Standard Time, a UTC offset of UTC−4. AST also stands for Arabia Standard Time (UTC+3), used in Saudi Arabia, Kuwait and Qatar. This page covers Atlantic Standard Time.

Is AST the same as ADT?

No. AST (UTC−4) is standard (winter) time; ADT (UTC−3) is daylight (summer) time, one hour ahead. The umbrella term “Atlantic Time” refers to whichever is in effect, so it is always safe to write Atlantic Time when you are unsure.

When do the clocks change for AST?

In 2026, clocks go forward into ADT on Sunday, March 8 and back into AST on Sunday, November 1. The dates shift by a week or so each year; this page always shows the live, correct schedule.

What time is it in AST right now?

It is currently 8:15 AM on Monday, June 22, 2026 in AST (UTC−4).

Where is AST used?

Atlantic Canada in winter; Puerto Rico and most of the Caribbean year-round. Cities currently on this time include San Juan.

Does AST only mean one time zone?

AST also stands for Arabia Standard Time (UTC+3), used in Saudi Arabia, Kuwait and Qatar. This page covers Atlantic Standard Time.

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