AST - Time Zone Information for Atlantic Standard Time
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| Time Zone Name | AST |
| AST Time Zone Description | Atlantic Standard Time |
| AST Time Zone Offset | UTC−04 Hours |
| Corresponding Daylight Saving Time for AST | Atlantic Daylight Time (ADT) |
| Daylight Saving Time Starts by | 12 March 2023 |
| Daylight Saving Time Ends by | 05 November 2023 |
| What to do when Daylight Saving Time Starts in AST | Clocks to be forwarded by 1 hour |
| Countries following AST in Winter & ADT in Summer | Parts of Canada, Bermuda |
| Countries following AST in both summer and winter | Antigua and Barbuda, Barbados Barbados, Dominica, Dominican Republic, Guadeloupe, Martinique, Saint-Barthélemy, Saint-Martin, Grenada, Aruba, Bonaire, Curaçao, Saba, Sint Eustatius, Sint Maarten, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad and Tobago, Anguilla, British Virgin Islands, Montserrat, Puerto Rico, United States Virgin Islands |
| Cities following AST in Winter & ADT in Summer | Halifax, Hamilton |
| Cities following AST in both Summer and Winter | Saint John's, Bridgetown, Roseau, Santo Domingo,Basse-Terre, Fort-de-France, Gustavia, Marigot, St. George's, Oranjestad, Bonaire, Willemstad, The Bottom, Oranjestad - Sint Eustatius, Philipsburg, Basseterre, Castries, Kingstown, Port of Spain, The Valley, Road Town, Brades, San Juan-Puerto Rico, Charlotte Amalie |
| Other Time Zones with same UTC offset as AST | BOT-Bolivia Time,CLT-Chile Standard Time,ECT-Eastern Caribbean Time,FKT-Falkland Islands Time,GYT-Guyana Time,PYT-Paraguay Time |
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