将UTC时间/日期转换为本地时间/日期保持毫秒

// 假设我们有一个UTC时间字符串
const utcTimeString = "2023-10-05T14:30:00.123Z";

// 使用Date对象解析UTC时间字符串
const utcDate = new Date(utcTimeString);

// 将UTC时间转换为本地时间
const localTimeString = utcDate.toLocaleString('en-US', {
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
    fractionalSecondDigits: 3,
    timeZoneName: 'short'
});

console.log("本地时间:", localTimeString);

const options = {
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
    fractionalSecondDigits: 3,
    timeZone: 'Asia/Shanghai' // 指定目标时区
};

const formatter = new Intl.DateTimeFormat('en-US', options);
const localTimeString = formatter.format(utcDate);

console.log("本地时间:", localTimeString);