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

<?php

return [
    [
        '21-Dec-2000',
        1,
        52,
    ],
    [
        '1995-01-01',
        1,
        1,
    ],
    [
        '3/7/1977',
        27,
    ],
    [
        '3/7/1977',
        'A',
        '#VALUE!',
    ],
    [
        '3/7/1977',
        0,
        '#NUM!',
    ],
    [
        'Invalid',
        1,
        '#VALUE!',
    ],
    [
        -1,
        '#NUM!',
    ],
];