JavaScript 格式化带时区的时间戳

formatDate(date) {
    var arr = date.split("T");
    var d = arr[0];
    var darr = d.split('-');
    var t = arr[1];
    var tarr = t.split('.000');
    var marr = tarr[0].split(':');
    var dd = parseInt(darr[0]) + "/" + parseInt(darr[1]) + "/" + parseInt(darr[2]) + " " + parseInt(marr[0]) + ":" + parseInt(marr[1]) + ":" + parseInt(marr[2]);

    return this.formatDateTime(dd);
},


formatDateTime(date) {
    let time = new Date(Date.parse(date));
    time.setTime(time.setHours(time.getHours() + 8));

    let Y = time.getFullYear() + '-';
    let M = this.addZero(time.getMonth() + 1) + '-';
    let D = this.addZero(time.getDate()) + ' ';
    let h = this.addZero(time.getHours()) + ':';
    let m = this.addZero(time.getMinutes()) + ':';
    let s = this.addZero(time.getSeconds());

    return Y + M + D + h + m + s;
},

addZero(num) {
    return num < 10 ? '0' + num : num;
}

let date = '2021-09-28T02:19:14.878Z'

console.log(date);

console.log(this.formatDate(date));