js new date时区

// 获取当前时间的 UTC 时间
let now = new Date();
console.log(now.toUTCString()); // 输出类似 "Mon, 27 Jul 2023 12:34:56 GMT"

// 创建一个指定 UTC 时间的 Date 对象
let utcDate = new Date(Date.UTC(2023, 6, 27, 12, 34, 56));
console.log(utcDate); // 输出一个 Date 对象，表示 UTC 时间

// 获取 UTC 时间的特定部分
let year = utcDate.getUTCFullYear(); // 2023
let month = utcDate.getUTCMonth(); // 6 (注意月份是从 0 开始的)
let day = utcDate.getUTCDate(); // 27
let hours = utcDate.getUTCHours(); // 12
let minutes = utcDate.getUTCMinutes(); // 34
let seconds = utcDate.getUTCSeconds(); // 56

let localDate = new Date();
let utcTime = localDate.getTime() + (localDate.getTimezoneOffset() * 60000);
let utcDate = new Date(utcTime);
console.log(utcDate.toUTCString());

let utcDate = new Date(Date.UTC(2023, 6, 27, 12, 34, 56));
let localDate = new Date(utcDate.getTime() - (utcDate.getTimezoneOffset() * 60000));
console.log(localDate.toString());