function SwedishSocialSecurityNumber(socialSecurityNumber){
    var _isOver100 = false;
    var _socialSecurityNumber = socialSecurityNumber;


    if(!_hasTheRightPattern())
        throw new Error('The SSN has to have the format YYMMDD-XXXX or YYMMDD+XXXX');

    var _year = parseInt(_socialSecurityNumber.substring(0,2));
    var _month = parseInt(_socialSecurityNumber.substring(2,4));
    var _day = parseInt(_socialSecurityNumber.substring(4,6));
    var _code = parseInt(_socialSecurityNumber.substring(7,11));

    if(_socialSecurityNumber.substring(6, 7) == '+') _isOver100 = true;

    if(!_isDateValid(_getFullYear(), _month, _day))
        throw new Error('The given date is not valid or is fictional');

    if(_getCheckSum() != _socialSecurityNumber.substring(10,11))
        throw new Error("The control number is invalid");

    this.socialSecurityNumber = function() {
        return _socialSecurityNumber;
    };

    function _getFullYear(){
        var currentYear = new Date().getFullYear();
        var ret = 0;

        if(_year < 10){
            ret = currentYear.toString().substring(0,2) + "0" + _year.toString();
        } else {
            ret = currentYear.toString().substring(0,2) +  _year.toString();
        }

        if(_isOver100) return parseInt(ret) - 100;
        if( parseInt(ret) > currentYear ) return parseInt(ret) - 100;

        return(parseInt(ret));
    }

    function _getCheckSum(){
        var variegated = 2;
        var temp = 0;
        var list = [];

        for(i = 0; i < _socialSecurityNumber.length - 1; i++){
            if( i == 6) continue;

            temp = parseInt(_socialSecurityNumber[i]);
            temp = temp * variegated;
            tempStr = temp.toString();
            for(j = 0; j < tempStr.length; j++) {
                list.push(parseInt(tempStr[j]));
            }

            variegated = variegated == 2 ? 1 : 2;
            temp = 0;
        }

        var sum = 0;
        for(i = 0; i < list.length; i++) sum = sum + list[i];

            return(10 - (sum % 10));
    }

    function _hasTheRightPattern(){
        var pattern = /^[0-9]{2}[0-1][0-9][0-3][0-9][-|+][0-9]{4}$/
        return pattern.test(_socialSecurityNumber);
    }

    function _isDateValid(){
        var d = new Date(_getFullYear(), _month - 1, _day);
        if(isNaN(d)) return false;

        var currentDate = new Date();
        if(d > currentDate) return false;
        if(d.getFullYear() == _getFullYear() && (d.getMonth() + 1) == _month && d.getDate() == _day) return true;
        return false;
    }

    this.getFullYear = function() {
        return _getFullYear();
    };

    this.isFemale = function() {
        if((parseInt(this.socialSecurityNumber().substring(9, 10)) % 2) === 0) return true;
        return false;
    };

    this.isMale = function() {
        return !this.isFemale();
    };

    this.getYear = function() {
        return _year;
    };

    this.getMonth = function(){
        return _month;
    };

    this.getDay = function() {
        return _day;
    };

    this.getCode = function() {
        return _code;
    };
}