js将UTC时间转化为当地时区时间用JS将指定时间转化成用户当地时区的时间

var d = new Date();
      var local = d.getTime();
      var offset = d.getTimezoneOffset() * 60000;
      var localUtc = new Date().getTimezoneOffset() / 60;
      var utcTime;
      if (localUtc > 0) {
        utcTime = local - offset;
      } else {
        utcTime = local + offset;
      }

      console.log("localUtc: " + localUtc);
      var localTime = utcTime + 3600000 * Math.abs(localUtc);

      console.log("localTime: " + localTime);
      var nd = new Date(localTime);
      var YY = nd.getFullYear() + "年";
      var MM = nd.getMonth() + 1 + "月";
      var dd = nd.getDate() + "日";
      var hh = nd.getHours() + ":";
      var mm = nd.getMinutes() + ":";
      var ss = nd.getSeconds();

      console.log(YY + MM + dd + hh + mm + ss);

console.log(new Date().getTimezoneOffset()/60)   // -8

var timezOne= 8; //目标时区时间，东八区
      var offset_GMT = new Date().getTimezoneOffset(); // 本地时间和格林威治的时间差，单位为分钟
      var nowDate = new Date().getTime(); // 本地时间距 1970 年 1 月 1 日午夜（GMT 时间）之间的毫秒数
      var targetDate = new Date(
        nowDate + offset_GMT * 60 * 1000 + timezone * 60 * 60 * 1000
      );
      console.log("东8区现在是：" + targetDate);

// 将传入的时间转换为new Date时间格式
      const toDate = new Date("2020-09-10 06:26:59");
      console.log(toDate.getHours());
      var d = toDate;
      var localTime = d.getTime();
      var localOffset = d.getTimezoneOffset() * 60000; //getTimezoneOffset()返回是以分钟为单位，需要转化成ms
      var utc = localTime + localOffset;
      var offset = 9; //以韩国时间为例，东9区
      var korean = utc + 3600000 * offset;
      var nd = new Date(korean);
      console.log("Korean time is " + nd.toLocaleString());  // Korean time is 2020/9/10 上午7:26:59