UTC 时间转化为北京时间

// UTC 时间转化为北京时间
function utc2beijing(utcTime) {
    var T_pos = utcTime.indexOf('T');
    var Z_pos = utcTime.indexOf('Z');
    var year_month_day = utcTime.substr(0,T_pos);
    var hour_minute_second = utcTime.substr(T_pos+1,Z_pos-T_pos-1);
    var new_datetime = year_month_day+" "+hour_minute_second; // 2017-03-31 08:02:06

    // 处理成为时间戳
    timestamp = new Date(Date.parse(new_datetime));
    timestamp = timestamp.getTime();
    timestamp = timestamp/1000;

    // 增加8个小时，北京时间比utc时间多八个时区
    var timestamp = timestamp+8*60*60;

    // 时间戳转为时间
    const bjTime = new Date(parseInt(timestamp) * 1000).toLocaleString().replace(/\//g, '.').replace(/[\u4e00-\u9fa5]/g, '');
    return bjTime; 
}
// utc2beijing('2020-04-17T02:31:04.000000Z')
// "2020.4.17 10:31:04"