datefactory.js

const fullDates = ["Monday", "Tuesday", "Wednesday", "Thrusday", "Friday", "Saturday", "Sunday"];
const shortDates = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"];

const fullMonths = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
const shortMonths = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];

const re = /(MM?M?M?|ddd?d?|YYYY|YY|HH?|hh?|mm?|tt|.)/g;

function contains(array, props) {
  if(!props.splice) props = [props];

  if(props.length < 2) return array.indexOf(props[0]) > -1;

  for(let i = 0, len = props.length; i < len; i++) {
    if(array.indexOf(props[i]) < 0) return false;
  }
  return true;
};

function DateFactory(date = {}, seperator = ".") {
  if(date instanceof Date) {
    this._date = { year: date.getFullYear(), month: date.getMonth(), date: date.getDate() };
    this._dateObj = date;
  } else {
    this._date = {...date};
  }

  // because current database has day in fromDate which should be date
  if(!this._date.day) {
    this._date.day = this._date.date;
  }

  if(!this._date.date) {
    this._date.date = this._date.day;
  }


  if(contains(Object.getOwnPropertyNames(date), ["month", "date", "year"])) {
    this._dateObj = new Date(date.year, date.month, date.date);
  }
}

DateFactory.prototype.isLeapYear = function(date = {}) {
  return new Date(date.year, 1, 29).getMonth() === 1;
};

DateFactory.prototype.isPresent = function() {
  return Object.getOwnPropertyNames(this._date).contains("month", "year");
};

DateFactory.prototype.formatDate = function(formatTemplate = "dd.MM.YYYY") {
  const tokens = formatTemplate.match(re);

  return tokens.map(token => {
    switch(token) {
    case 'd':
      return this._date.day ? this._date.day : "";
    case 'dd':
      return (this._date.day / 10 < 0) ? "0" + this._date.day : (this._date.day == 0 ? "" : this._date.day);
    case 'ddd':
      return shortDates[this._dateObj.getDay()]
    case 'dddd':
      return fullDates[this._dateObj.getDay()]
    case 'M':
      return this._date.month ? this._date.month : "";
    case 'MM':
      return (this._date.month / 10 < 0) ? "0" + this._date.month : (this._date.month == 0 ? "" : this._date.month);
    case  'MMM':
      return shortMonths[this._date.month];
    case 'MMMM':
      return fullMonths[this._date.month]
    case 'YY':
      return (new Date("" + this._date.year)).getYear();
    case 'YYYY':
      return (new Date("" + this._date.year)).getFullYear();
    case 'HH':
      if(this._dateObj) {
        let hours = this._dateObj.getHours();
        return (hours / 10 < 0) ? "0" + hours : hours;
      }
    case 'hh':
      if(this._dateObj) {
        let hours = this._dateObj.getHours();
        hours = hours > 12 ? hours - 12 : hours;
        return (hours / 10 < 1) ? "0" + hours : hours;
      }
    case 'mm':
      if(this._dateObj) {
        let minutes = this._dateObj.getMinutes();
        return (minutes / 10 < 1) ? "0" + minutes : minutes;
      }
    case 'tt':
      if(this._dateObj) {
        return this._dateObj.getHours() > 12 ? "PM" : "AM";
      }
    default:
      return token;
    }
  }).join("");
};

DateFactory.compareDates = function(fromDateObj = {}, toDateObj = {}) {
  var fromDate = fromDateObj, toDate = toDateObj;

  if(fromDateObj instanceof Date) {
    fromDate = { year: fromDateObj.getFullYear(), month: fromDateObj.getMonth() + 1, day: fromDateObj.getDate() };
  }

  if(toDateObj instanceof Date) {
    toDate = { year: toDateObj.getFullYear(), month: toDateObj.getMonth() + 1, day: toDateObj.getDate() };
  }


  if(fromDate.year < toDate.year) return 1;
  if(fromDate.year > toDate.year) return -1;

  if(fromDate.month < toDate.month) return 1;
  if(fromDate.month > toDate.month) return -1;

  if(fromDate.day < toDate.day) return 1;
  if(fromDate.day > toDate.day) return -1;

  return 0;
};

export default DateFactory;