AST: Atlantic Standard Time
AST stands for Atlantic Standard Time. It's UTC−4.
Halifax is on ADT right now, not AST. It goes back to AST on Sunday 1 November 2026.
Places that use AST
- Halifax ADT
- San Juan AST
- Santo Domingo AST
Compare AST with your time
Your own time zone comes first, then AST. Add teammates or more cities, then click an hour to plan a meeting.
AST in other time zones now
Questions
What does AST stand for?
AST stands for Atlantic Standard Time. It's UTC−4. Halifax is on ADT right now, not AST. It goes back to AST on Sunday 1 November 2026.
Updated Sunday 11 October 2026