jq 判断两个时间戳直间相差几天

function DateDiff(start, end) {
　　var sdate = new Date(start);
　　var now = new Date(end);
　　var days = now.getTime() - sdate.getTime();
　　var day = parseInt(days / (1000 * 60 * 60 * 24));
　　return day;
}