PhpSpreadsheet/tests/data/Calculation/DateTime/DAY.php

<?php

//  Date Value, Result

return [
    [
        19, // Result for Excel
        19, // Result for OpenOffice
        22269,
    ],
    [
        1, // Result for Excel
        1, // Result for OpenOffice
        30348,
    ],
    [
        10, // Result for Excel
        10, // Result for OpenOffice
        30843,
    ],
    [
        11, // Result for Excel
        11, // Result for OpenOffice
        '11-Nov-1918',
    ],
    [
        28, // Result for Excel
        28, // Result for OpenOffice
        '28-Feb-1904',
    ],
    [
        '#VALUE!',  // Result for Excel
        '#VALUE!',  // Result for OpenOffice
        'Invalid',
    ],
    [
        '#NUM!', // Result for Excel
        29, // Result for OpenOffice
        -1,
    ],
    [
        1, // Result for Excel
        31, // Result for OpenOffice
        1,
    ],
    [
        0, // Result for Excel
        30, // Result for OpenOffice
        0.5,
    ],
    [
        0, // Result for Excel
        30, // Result for OpenOffice
        0,
    ],
];