PhpSpreadsheet/tests/data/Shared/Date/FormattedPHPToExcel1900.php

<?php

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