자바스크립트 날짜 계산 사파리 safari 브라우저도 가능

function wz_dateDiff(_date1, _date2) {

    var diffDate_1 = _date1.replace(/-/gi,"/");

diffDate_1 = new Date(diffDate_1);

    var diffDate_2 = _date2.replace(/-/gi,"/");

diffDate_2 = new Date(diffDate_2);

    diffDate_1 =new Date(diffDate_1.getFullYear(), diffDate_1.getMonth()+1, diffDate_1.getDate());

    diffDate_2 =new Date(diffDate_2.getFullYear(), diffDate_2.getMonth()+1, diffDate_2.getDate());

    var diff = Math.abs(diffDate_2.getTime() - diffDate_1.getTime());

diff = Math.ceil(diff / (1000 * 3600 * 24));

    return diff;

}