<?php // Excel DateTimeStamp Result Comments return [ // PHP 32-bit Earliest Date 14-Dec-1901 [ -2147472000, 714, ], // 31-Dec-1903 [ -2082931200, 1461, ], // Excel 1904 Calendar Base Date 01-Jan-1904 [ -2082844800, 1462, ], // 02-Jan-1904 [ -2082758400, 1463, ], // 19-Dec-1960 [ -285120000, 22269, ], // PHP Base Date 01-Jan-1970 [ 0, 25569, ], // 07-Dec-1982 [ 408067200, 30292, ], // 12-Jun-2008 [ 1213228800, 39611, ], // PHP 32-bit Latest Date 9-Jan-2038 [ 2147472000, 50424, ], // 18-May-1903 13:37:46 [ -2102494934, 1234.56789, ], // 18-Oct-1933 16:17:37 [ -1142494943, 12345.6789, ], // 12:00:00 [ 43200, 0.5, ], // 18:00.00 [ 64800, 0.75, ], // 02:57:46 [ 10666, 0.12345, ], ];