jquery 时间操作

function strftime(date) {
    let dateee = new Date(date).toJSON();
    return new Date(+new Date(dateee) + 8 * 3600 * 1000).toISOString().replace(/T/g, ' ').replace(/\.[\d]{3}Z/, '')
}

console.log(strftime("2022-05-20T12:24:18.000+0000"))
// 输出：2022-05-20 20:24:18

let timestamp1 = Date.parse(new Date())
console.log(timestamp1)
// 1667467418000

let timestamp2 = (new Date()).valueOf()
console.log(timestamp2)
// 1667467418100

let timestamp3 = new Date().getTime()
console.log(timestamp3)
// 1667467418100

let timestamp4 = Number(new Date())
console.log(timestamp4)
// 1667467418100

// 时间戳为毫秒 13位
let now = new Date(1653038423000),
    y = now.getFullYear(),
    m = now.getMonth() + 1,
    d = now.getDate(),
    res = y + "-" + (m < 10 ? "0" + m : m) + "-" + (d < 10 ? "0" + d : d) + " " + now.toTimeString().substr(0, 8);
console.log(res); 
// 输出：2022-05-20 17:20:23

<script src="js/jquery-min.js"></script>
<script>
	function time() {
		dt = new Date();
		
		var year = dt.getFullYear();
		var month = dt.getMonth();
		var date = dt.getDate();
		
		// alert(year+' '+month+''+date)
		var h = dt.getHours();//获取时
		var m = dt.getMinutes();//获取分
		var s = dt.getSeconds();//获取秒
		
		var wee = new Array("日 ", "一 ", "二 ", "三 ", "四 ", "五 ", "六 ");
		var weekstr = wee[new Date().getDay()];
		
		
		document.getElementById("showTime").innerHTML = "当前时间为：" + year + "年"+ month + "月"+ date + "日"+ h + "时" + m + "分" + s + "秒 星期"+weekstr;
		setTimeout("time()", 1000); //设定定时器，循环运行
	}
</script>

<span id="showTime"></span>
<script>
    time();
</script>