AST time now
Atlantic Standard TimeUTC−4
Halifax is not on AST right now (it is on ADT), but other places are.
AST in other time zones, now
Observatory log
AST, observed
- 01Stands for
Atlantic Standard Time
UTC−4 ·
America/Halifax- 02When it is used
AST is the standard (winter) time of Halifax; in summer the clocks switch to ADT.
Nextin use in Halifax from 1 November 2026 to 14 March 2027
Thenin use in Halifax from 7 November 2027
- 03In use right now
In 4 time zones
Santiago, San Juan, Fort-de-France, Bridgetown
Part of the next 12 months: Halifax, Moncton, Sydney, Hamilton, Labrador City, Qaanaaq.
All year: Santiago, San Juan, Fort-de-France, Bridgetown.
- 04Countries
Meanings
AST can mean more than one time
Abbreviations are not unique. Check which one is meant before you convert a time; an IANA zone or a city name is never ambiguous.
- Atlantic Standard TimeUTC−4this page
- Arabia Standard TimeUTC+3
Asia/Riyadh
Questions
Asked about AST
What is AST?
AST stands for Atlantic Standard Time, which is UTC−4. The clock at the top of this page shows the current AST time, live. The letters AST are also used for: Arabia Standard Time (UTC+3).
Is AST in use right now?
Halifax is not on AST right now (it is on ADT), but other places are. AST is the standard (winter) time of Halifax; in summer the clocks switch to ADT.
Is it AST or ADT now?
Halifax is on ADT now; it returns to AST on 1 November 2026.