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About AST
AST (Atlantic Standard Time) is a time zone observed in parts of North America and the Caribbean. The time zone offset of AST is UTC−04:00, which means it is 4 hours behind Coordinated Universal Time (UTC).
Atlantic Standard Time is used throughout the year in several regions and does not always observe daylight saving time. In some locations, AST remains the standard local time year-round.
AST is followed in areas such as Puerto Rico, the U.S. Virgin Islands, the Dominican Republic, and several Caribbean nations. It is also used in parts of Canada during the standard time period.