JavaScript中各种时间转换问题详解(YYYY-MM-DD、时间戳、中国标准时间)

function timestampToTime(timestamp) {
        var date = new Date(timestamp * 1000);//时间戳为10位需*1000，时间戳为13位的话不需乘1000
        var Y = date.getFullYear() + '-';
        var M = (date.getMonth()+1 < 10 ? '0'+(date.getMonth()+1):date.getMonth()+1) + '-';
        var D = (date.getDate()< 10 ? '0'+date.getDate():date.getDate())+ ' ';
        var h = (date.getHours() < 10 ? '0'+date.getHours():date.getHours())+ ':';
        var m = (date.getMinutes() < 10 ? '0'+date.getMinutes():date.getMinutes()) + ':';
        var s = date.getSeconds() < 10 ? '0'+date.getSeconds():date.getSeconds();
        return Y+M+D+h+m+s;
    }

var stringTime = '2012-10-12 22:37:33';
//将获取到的时间转换成时间戳
var timestamp = Date.parse(new Date(stringTime));

 let y = date.getFullYear()
 let m = date.getMonth() + 1
 m = m < 10 ? ('0' + m) : m
 let d = date.getDate()
 d = d < 10 ? ('0' + d) : d
 let h =date.getHours()
 h = h < 10 ? ('0' + h) : h
 let M =date.getMinutes()
 M = M < 10 ? ('0' + M) : M
 let s =date.getSeconds()
 s = s < 10 ? ('0' + s) : s
 let dateTime= y + '-' + m + '-' + d + ' ' + h + ':' + M + ':' + s;

const time = 1531065600000；//时间戳（数字）
const youData = new Data(time);

Date.parse(Time)

if (new Date(str).toDateString() === new Date().toDateString()) {
    //今天
    console.log("当天");
} else if (new Date(str) < new Date()){
    //之前
    console.log(new Date(str).toISOString().slice(0,10));
}

 getCurrentDate() {
        var date = new Date();
        var seperator1 = "-";
        var year = date.getFullYear();
        var month = date.getMonth() + 1;
        var strDate = date.getDate();
        if (month >= 1 && month <= 9) {
          month = "0" + month;
        }
        if (strDate >= 0 && strDate <= 9) {
          strDate = "0" + strDate;
        }
        var currentdate = year + seperator1 + month + seperator1 + strDate;
        return currentdate;
    },
 
 
//2018-12-1