<?php // Year Month Day Hours Minutes Seconds Result Comments return [ // PHP 32-bit Earliest Date 14-Dec-1901 [ 714, 1901, 12, 14, ], // 31-Dec-1903 [ 1461, 1903, 12, 31, ], // Excel 1904 Calendar Base Date 01-Jan-1904 [ 1462, 1904, 1, 1, ], // 02-Jan-1904 [ 1463, 1904, 1, 2, ], // 19-Dec-1960 [ 22269, 1960, 12, 19, ], // PHP Base Date 01-Jan-1970 [ 25569, 1970, 1, 1, ], // 07-Dec-1982 [ 30292, 1982, 12, 7, ], // 12-Jun-2008 [ 39611, 2008, 6, 12, ], // PHP 32-bit Latest Date 19-Jan-2038 [ 50424, 2038, 1, 19, ], // 18-May-1903 13:37:46 [ 1234.56789, 1903, 5, 18, 13, 37, 46, ], // 18-Oct-1933 16:17:37 [ 12345.6789, 1933, 10, 18, 16, 17, 37, ], ];