ToDate

ToDate[time] converts an absolute time in seconds since the beginning of January 1, 1900 to a date of the form {y, m, d, h, m, s}.

Examples

ToDate[0]
(* {1900, 1, 1, 0, 0, 0} *)

ToDate[AbsoluteTime[]]
(* current date and time *)

Please visit the official Wolfram Language Reference for more details.