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+"
");

输出：timestamp: 1439078496789

其他方法：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+"
");

输出：

date: 2015-8-9 8:1:36.789