js timestamp与datetime之间的相互转换

1.  datetime转换成timestamp

strdate = "2015-08-09 08:01:36:789";

var d = new Date(strdate);

var timestamp=Math.round(d.getTime());

document.write("timestamp: "+timestamp+"<br>");

输出：

timestamp: 1439078496789

其它方法：

var timestamp = Date.parse(strdate);

或者

var timestamp = d.valueOf();

注意：

strdate要加上毫秒，不然再转换成datetime会丢失毫秒

2.  timestamp转换成datetime

function timeStamp2String (time){

        var datetime = new Date();

         datetime.setTime(time);

         var year = datetime.getFullYear();

         var month = datetime.getMonth() + 1;

         var date = datetime.getDate();

         var hour = datetime.getHours();

         var minute = datetime.getMinutes();

         var second = datetime.getSeconds();

         var mseconds = datetime.getMilliseconds();

         return year + "-" + month + "-" + date+" "+hour+":"+minute+":"+second+"."+mseconds;

};

var time = "1439078496789"; //or time=1439018115000; 结果一样

var strdate2 = timeStamp2String(time);

document.write("date: "+strdate2+"<br>");

输出：

date: 2015-8-9 8:1:36.789