countdown.js

export default class Countdown {
  constructor(futureDate) {
    this.futureDate = futureDate;
  }
  get _futureDate() {
    return new Date(this.futureDate);
  }
  get _currentDate() {
    return new Date();
  }
  get _timeStampDiff() {
    return this._futureDate.getTime() - this._currentDate.getTime();
  }
  get days() {
    return Math.floor(this._timeStampDiff / (24 * 60 * 60 * 1000));
  }
  get hours() {
    return Math.floor(this._timeStampDiff / (60 * 60 * 1000));
  }
  get minutes() {
    return Math.floor(this._timeStampDiff / (60 * 1000));
  }
  get seconds() {
    return Math.floor(this._timeStampDiff / 1000);
  }
  get total() {
    const days = this.days;
    const hours = this.hours % 24;
    const minutes = this.minutes % 60;
    const seconds = this.seconds % 60;
    return {
      days,
      hours,
      minutes,
      seconds,
    };
  }
}