JS操作日期

//JS 转换JAVA标准日期格式

var date=new Date("Tue Oct 20 2010 00:00:00 GMT+0800");
        var year=date.getYear();
        var month=date.getMonth()>8?date.getMonth()+1:"0"+(date.getMonth()+1);
        var day=date.getDate();
        var newDate=year+"-"+month+"-"+day;
        alert(newDate);

//求日期差

var day1 = (new Date).setFullYear(2011, 7, 16);
var day2 = (new Date).setFullYear(2011, 7, 20);
var number_of_days = (day2 - day1) / 86400000;