如何在UTC服务器环境下获取本地时区的正确日始日末Unix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
const selectedUnixTime = subDays(new Date(), 1).getTime(); // 假设我们关注昨天

// 步骤1：将UTC时间戳转换为本地时区的Date对象
const localDate = utcToZonedTime(selectedUnixTime, timezone);

// 步骤2：对本地时区Date对象应用startOfDay和endOfDay
const localStartDateAttempt = getTime(startOfDay(localDate));
const localEndDateAttempt = getTime(endOfDay(localDate));

// 期望的正确值（例如，手动验证的雅加达时区昨日开始和结束）
// 假设 selectedUnixTime 对应 2023-05-30T00:00:00Z (UTC)
// 那么在 Asia/Jakarta (+07:00) 对应 2023-05-30T07:00:00+07:00
// 雅加达的 "昨天" (May 29) 的开始是 2023-05-29T00:00:00+07:00
// 雅加达的 "昨天" (May 29) 的结束是 2023-05-29T23:59:59.999+07:00
// 转换成UTC时间戳:
// 2023-05-29T00:00:00+07:00 => 2023-05-28T17:00:00Z (Unix: 1685379600000)
// 2023-05-29T23:59:59.999+07:00 => 2023-05-29T16:59:59.999Z (Unix: 1685465999999)
const correctLocalStartDate = 1685379600000;
const correctLocalEndDate = 1685465999999;


console.log(
  "--- 初始尝试结果 ---"
);
console.log(
  {
    isItCorrect: localStartDateAttempt === correctLocalStartDate,
    correctDate: new Date(correctLocalStartDate).toISOString(),
    systemDate: new Date(localStartDateAttempt).toISOString(),
  },
  "尝试获取的本地日开始时间"
);

console.log(
  {
    isItCorrect: localEndDateAttempt === correctLocalEndDate,
    correctDate: new Date(correctLocalEndDate).toISOString(),
    systemDate: new Date(localEndDateAttempt).toISOString(),
  },
  "尝试获取的本地日结束时间"
);

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

const timezone = "Asia/Jakarta"; // 目标本地时区
const selectedUnixTime = subDays(new Date(), 1).getTime(); // 假设我们关注昨天

// 步骤1：将UTC时间戳转换为本地时区的Date对象
const localDate = utcToZonedTime(selectedUnixTime, timezone);

// 步骤2 & 3：对本地时区Date对象应用startOfDay/endOfDay，
// 然后将结果（在本地时区意义上的日始日末）转换回UTC时间戳
const correctLocalStartDate = getTime(
  zonedTimeToUtc(startOfDay(localDate), timezone)
);
const correctLocalEndDate = getTime(
  zonedTimeToUtc(endOfDay(localDate), timezone)
);

// 期望的正确值（与前述示例相同）
const expectedCorrectStartDate = 1685379600000;
const expectedCorrectEndDate = 1685465999999;

console.log(
  "\n--- 修正后的结果 ---"
);
console.log(
  {
    isItCorrect: correctLocalStartDate === expectedCorrectStartDate,
    correctDate: new Date(expectedCorrectStartDate).toISOString(),
    systemDate: new Date(correctLocalStartDate).toISOString(),
  },
  "正确获取的本地日开始时间"
);

console.log(
  {
    isItCorrect: correctLocalEndDate === expectedCorrectEndDate,
    correctDate: new Date(expectedCorrectEndDate).toISOString(),
    systemDate: new Date(correctLocalEndDate).toISOString(),
  },
  "正确获取的本地日结束时间"
);