Override browser date for testing or something

overrideBrowserDate.js

(() => {
  const dayDiff = 2
  const offsetMs = dayDiff * 24 * 60 * 60 * 1000; // 이틀 = 2일 * 24시간 * 60분 * 60초 * 1000ms
  const futureTime = Date.now() + offsetMs;

  const OriginalDate = Date;
  class MockDate extends OriginalDate {
    constructor(...args) {
      if (args.length === 0) {
        return new OriginalDate(futureTime);
      }
      return new OriginalDate(...args);
    }
    static now() {
      return futureTime;
    }
    static parse = OriginalDate.parse;
    static UTC = OriginalDate.UTC;
    static get [Symbol.species]() {
      return OriginalDate;
    }
  }

  window.Date = MockDate;
})();