版权声明：本篇博客内容来源于本人亲身经历，属于本人原创，转载请注明出处，感谢分享~~ https://blog.csdn.net/hl_qianduan/article/details/86530290
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>js实时获取当前时间、2周前、3月前</title>
</head>
<body>
<script>
var dt = new Date();
function nowtime(dt){
return dt.getFullYear() + "-" +
(((dt.getMonth() + 1)<10)?("0" + (dt.getMonth()+1)) : (dt.getMonth()+1))
+ "-" +((dt.getDate()<10)?("0" + dt.getDate()) : dt.getDate())
+" "+((dt.getHours()<10)?("0" + dt.getHours()) : dt.getHours())
+":"+((dt.getMinutes()<10)?("0" + dt.getMinutes()) : dt.getMinutes())
+":"+((dt.getSeconds()<10)?("0" + dt.getSeconds()) : dt.getSeconds());
}
var dtt = new Date();
dtt.setMonth(dtt.getMonth() - 3);
var current = nowtime(dtt);
document.write("当前时间："+nowtime(dt)+"<br>");
document.write("两周前："+getDay(-14)+"<br>");
document.write("三月前："+current);
function getDay(day) {
var today = new Date();
var targetday_milliseconds = today.getTime() + 1000 * 60 * 60 * 24 * day;
today.setTime(targetday_milliseconds); //注意，这行是关键代码
var tYear = today.getFullYear();
var tMonth = today.getMonth();
var tDate = today.getDate();
var tHours = today.getHours();
var tMinutes = today.getMinutes();
var tSeconds = today.getSeconds();
tMonth = doHandleMonth(tMonth + 1);
tDate = doHandleMonth(tDate);
tHours = doHandleMonth(tHours);
tMinutes = doHandleMonth(tMinutes);
tSeconds = doHandleMonth(tSeconds);
return tYear + "-" + tMonth + "-" + tDate+" "+tHours+":"+tMinutes+":"+tSeconds;
}
function doHandleMonth(month) {
var m = month;
if (month.toString().length == 1) {
m = "0" + month;
}
return m;
}
</script>
</body>
</html>