//1. 格林威治时间 GMT+ 8 = 北京时间 , 东八区
var now = new Date();
var nowStr = now.toString();// Mon Jul 12 2021 09:03:52 GMT+0800 (China Standard Time)
console.log(nowStr);
console.log(now.toUTCString()); //GMT标准时间, Mon, 12 Jul 2021 01:09:29 GMT
//2. 时间戳 Timestamp
var timeStamp = Date.now();
console.log(timeStamp);
//3. 解析ISO8602 格式
var dt = new Date('2021-07-08T08:55:55.374+0800');
console.log(dt.toString());