JavaScript中在UTC服务器环境下获取本地时区日期的起始与结束时间戳

const { startOfDay, endOfDay, getTime, subDays } = require("date-fns");
const { utcToZonedTime } = require("date-fns-tz");

const timezone = "Asia/Jakarta"; // 目标本地时区

// 假设我们有一个参考的Unix时间戳，例如昨天
const selectedUnixTime = subDays(new Date(), 1).getTime();

// 将UTC时间戳转换为表示本地时区时间的Date对象
const localDate = utcToZonedTime(selectedUnixTime, timezone);

// 尝试获取本地日期的开始和结束
const localStartDateAttempt = getTime(startOfDay(localDate));
const localEndDateAttempt = getTime(endOfDay(localDate));

// 假设正确的本地开始和结束时间戳（UTC表示）
// 例如，对于2023-05-30在Asia/Jakarta时区，其开始是2023-05-30 00:00:00 (Jakarta time)
// 对应UTC时间是 2023-05-29 17:00:00 UTC (1685379600000)
// 结束是 2023-05-30 23:59:59.999 (Jakarta time)
// 对应UTC时间是 2023-05-30 16:59:59.999 UTC (1685465999999)
const correctLocalStartDate = 1685379600000;
const correctLocalEndDate = 1685465999999;

console.log(
  {
    isItCorrect: localStartDateAttempt === correctLocalStartDate,
    correctDate: new Date(correctLocalStartDate),
    systemDate: new Date(localStartDateAttempt),
  },
  "尝试获取的开始日期"
);

console.log(
  {
    isItCorrect: localEndDateAttempt === correctLocalEndDate,
    correctDate: new Date(correctLocalEndDate),
    systemDate: new Date(localEndDateAttempt),
  },
  "尝试获取的结束日期"
);

{
  isItCorrect: false,
  correctDate: 2023-05-29T17:00:00.000Z, // 雅加达时间2023-05-30 00:00:00 对应的UTC
  systemDate: 2023-05-30T07:00:00.000Z   // 雅加达时间2023-05-30 14:0