Time Zone Abbreviations – Atlantic
| Abbreviation | Time zone name | Other names | Offset |
|---|---|---|---|
| ADT | Atlantic Daylight Time | HAA | UTC -3 |
| AST | Atlantic Standard Time | AST, HNA | UTC -4 |
| AT | Atlantic Time | UTC -4:00 / -3:00 | |
| AZOST | Azores Summer Time | UTC +0 | |
| AZOT | Azores Time | UTC -1 |