Summary of javascript date tools

let Utils = {
  /**
   * Is it the year of death? * @return {Boolse} true|false
   */
  isLeapYear: function(y) {
    return (y % 4 == 0 && y % 100 != 0) || y % 400 == 0;
  },
  /**
   * Returns the week number * @return {Number}
   */
  getWhatDay: function(year, month, day) {
    let date = new Date(year + '/' + month + '/' + day);
    let index = date.getDay();
    let dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
    return dayNames[index];
  },
  /**
   * Returns the week number * @return {Number}
   */
  getMonthPreDay: function(year, month) {
    let date = new Date(year + '/' + month + '/01');
    let day = date.getDay();
    if (day == 0) {
      day = 7;
    }
    return day;
  },
  /**
   * Returns the day of the month * @return {Number}
   */
  getMonthDays: function(year, month) {
    if (/^0/.test(month)) {
      month = month.split('')[1];
    }
    return [0, 31, this.isLeapYear(year) ? 29 : 28, 31, 30, 31, 30, 31, 30, 31, 30, 31, 30, 31][month];
  },
  /**
   * Fill in the digits * @return {string}
   */
  getNumTwoBit: function(n) {
    n = Number(n);
    return (n > 9 ? '' : '0') + n;
  },
  /**
   * Convert the date object to a string * @return {string}
   */
  date2Str: function(date, split) {
    if (typeof date == 'string') return date;
    split = split || '-';
    let y = date.getFullYear();
    let m = this.getNumTwoBit(date.getMonth() + 1);
    let d = this.getNumTwoBit(date.getDate());
    return [y, m, d].join(split);
  },
  /**
   * Returns a date format string * @param {Number} 0 returns today's date, 1 returns tomorrow's date, 2 returns the day after tomorrow's date, and so on * @return {string} '2014-12-31'
   */
  getDay: function(i) {
    i = i || 0;
    let date = new Date();
    let diff = i * (1000 * 60 * 60 * 24);
    date = new Date(date.getTime() + diff);
    return this.date2Str(date);
  },
  /**
   * Timestamp converted to date format * @return {String}
   */
  timestampToDate: function(timestamp) {
    let date = new Date(timestamp);
    return date.getFullYear() + '-' + getNumTwoBit(date.getMonth() + 1) + '-' + getNumTwoBit(date.getDate());
  },
  /**
   * Time comparison * @return {Boolean}
   */
  compareDate: function(date1, date2) {
    let startTime = new Date(date1.replace('-', '/').replace('-', '/'));
    let endTime = new Date(date2.replace('-', '/').replace('-', '/'));
    if (startTime >= endTime) {
      return false;
    }
    return true;
  },
  /**
   * Time comparison * @return {Boolean}
   */
  compareDateArr: function(date1, date2) {
    let startTime = new Date();
    startTime.setFullYear(parseInt(date1[0]), parseInt(date1[1]) - 1, parseInt(date1[2]));
    startTime.setHours(parseInt(date1[3]), parseInt(date1[4]));
    let endTime = new Date();
    endTime.setFullYear(parseInt(date2[0]), parseInt(date2[1]) - 1, parseInt(date2[2]));
    endTime.setHours(parseInt(date2[3]), parseInt(date2[4]));
    if (startTime >= endTime) {
      return false;
    }
    return true;
  },
  /**
   * Are the times equal? ​​* @return {Boolean}
   */
  isEqual: function(date1, date2) {
    let startTime = new Date(date1).getTime();
    let endTime = new Date(date2).getTime();
    if (startTime == endTime) {
      return true;
    }
    return false;
  },
  getDateArr(str) {
    return [this.getYear(str), this.getMonth(str), this.getDate(str), this.getHour(str), this.getMinute(str)];
  },
  isDateString(str) {
    return /\d{4}(\-|\/|.)\d{1,2}\1\d{1,2}/.test(str) || /^([01][0-9]|2[0-3])(:[0-5][0-9]){1,2}$/.test(str);
  },
  getYear(value) {
    return this.isDateString(value) ? value.split(' ')[0].split(/-|\/|\./)[0] : value.getFullYear();
  },
  getMonth(value) {
    return this.isDateString(value) ? value.split(' ')[0].split(/-|\/|\./)[1] : value.getMonth() + 1;
  },
  getDate(value) {
    return this.isDateString(value) ? value.split(' ')[0].split(/-|\/|\./)[2] : value.getDate();
  },
  getHour(value) {
    if (this.isDateString(value)) {
      const str = value.split(' ')[1] || '00:00:00';
      return str.split(':')[0];
    }
    return value.getHours();
  },
  getMinute(value) {
    if (this.isDateString(value)) {
      const str = value.split(' ')[1] || '00:00:00';
      return str.split(':')[1];
    }
    return value.getMinutes();
  }
};
export default Utils;