JS日期增加天數

var b = new Date();

var c = new Date(b.getFullYear(),b.getMonth(),b.getDate()+30); alert(c.getFullYear()+"-"+(c.getMonth()+1)+"-"+c.getDate())

new Date();時可以傳入參數，就是把字符串轉爲日期。

 

下面寫下對一個給定的日期增加一個天數之後的日期進行顯示

 

//給定一個yyyy-mm-dd的日期字符串，然後給定一個天數agreeDays

 

function test(DateOne,agreeDays){

var ADDTIME=agreeDays;

var OneMonth = DateOne.substring(5,DateOne.lastIndexOf ('-'));  

    var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf ('-')+1);  

    var OneYear = DateOne.substring(0,DateOne.indexOf ('-'));

var dt=new Date(OneYear,OneMonth,OneDay); 

var dtnow = new Date(dt.getTime()+ADDTIME*24*3600*1000);

//alert(dt30.toLocaleDateString().replace('年','-').replace('月','-').replace('日',''))

var nowYear = dtnow.getFullYear();

var nowMonth = dtnow.getMonth();

var nowDay = dtnow.getDate();

if(parseInt(nowMonth) < 10){

nowMonth = '0'+nowMonth;

}

if(parseInt(nowDay) < 10){

nowDay = '0'+nowDay;

}

alert(nowYear+"-"+nowMonth+"-"+nowDay);

}

 

 

 

返回給定日期agreeDays天后的日期

 

肯定不是最好的方法。。

讀者如果有，請留言告訴我啊~哈哈~