function OnInit(initData) {
    initData.name = 'ModifiedSpecial';
    initData.version = '2023-10-21';
    initData.copyright = '';
    initData.url = 'https://resource.dopus.com/t/customize-grouping-function-group-by-modified-year-month-or-year-week-number/46544';
    initData.desc = '';
    initData.default_enable = true;
    initData.min_version = '12.0';
}

function OnAddColumns(addColData) {
    var col = addColData.AddColumn();
    col.name = 'ModifiedSpecial';
    col.method = 'OnColumn';
}

function OnColumn(scriptColData) {
    // scriptColData.value = scriptColData.item.modify.Format('D#yyyy-MM');
    scriptColData.value = scriptColData.item.modify.Format('D#yyyy-WW'); // week
}