<?php // Unix TimeStamp Result Comments return [ [-2147472000, 714], // PHP 32-bit Earliest Date 14-Dec-1901 [-2082931200, 1461], // 31-Dec-1903 [-2082844800, 1462], // Excel 1904 Calendar Base Date 01-Jan-1904 [-2082758400, 1463], // 02-Jan-1904 [-285120000, 22269], // 19-Dec-1960 [0, 25569], // PHP Base Date 01-Jan-1970 [408067200, 30292], // 07-Dec-1982 [1213228800, 39611], // 12-Jun-2008 [2147472000, 50424], // PHP 32-bit Latest Date 19-Jan-2038 [-2102494934, 1234.56789], // 18-May-1903 13:37:46 [-1142494943, 12345.6789], // 18-Oct-1933 16:17:37 ];