時間戳轉換成 “yyyy-MM-dd hh:mm:ss”格式：

happenTimeFun(num){//時間戳資料處理

         let date = new Date(num);
        //時間戳為10位需*1000，時間戳為13位的話不需乘1000
    let y = date.getFullYear();
    let MM = date.getMonth() + 1;
    MM = MM < 10 ? ('0' + MM) : MM;//月補0
    let d = date.getDate();
    d = d < 10 ? ('0' + d) : d;//天補0
    let h = date.getHours();
    h 
 
= h < 10 ? ('0' + h) : h;//小時補0
    let m = date.getMinutes();
    m = m < 10 ? ('0' + m) : m;//分鐘補0
    let s = date.getSeconds();
    s = s < 10 ? ('0' + s) : s;//秒補0
    return y + '-' + MM + '-' + d + ' ' + h + ':' + m+ ':' + s;

}    
happenTimeFun(1628648245);

“yyyy-MM-dd hh:mm:ss”轉換成時間戳：

timeProcessing(){
    let timeDate 
 
= "2020-08-11 11:08:48";
    let Time = new Date(timeDate);
    console.log(Time)// (中國標準時間)
    let timestemp = Time.getTime();
    console.log(timestemp)
}