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
];