AST — Atlantic Standard Time
The standard time of Atlantic Canada and parts of the Caribbean in winter, including Halifax, Moncton, and Bermuda. Switches to ADT during daylight saving in regions that observe it.
- Abbreviation
- AST
- Full name
- Atlantic Standard Time
- UTC offset
- UTC-4
- Type
- Standard time
- Daylight saving variant
- ADT
Which cities use AST as their standard time?
Note: AST is ambiguous — it also refers to Arabia Standard Time (UTC+3), used across Saudi Arabia, Qatar, Kuwait, and Bahrain. On this site, /timezone/ast/ refers to the Atlantic North American variant.