PESEL

gistfile1.txt

var Pesel = {
    getDateByPesel: function (pesel) {
        var l, c, birth = [
                pesel.substr(0, 2),
                pesel.substr(2, 2),
                pesel.substr(4, 2)
            ],
            isOdd = function (c) {
                return (c % 2 === 1);
            }, years = {
                "0": "19",
                "2": "20",
                "4": "21",
                "6": "22",
                "8": "18",
            };
        l = +birth[1];
        c = Math.floor(l / 10);
        isOdd(c) && --c;
        return {
            year: +(years[c] + birth[0]),
            month: l - (c * 10),
            day: +birth[2]
        };
    },
    isValid: function (pesel) {
        if (pesel.length !== 11) return false;
        var multiples = [1, 3, 7, 9, 1, 3, 7, 9, 1, 3],
            control, number = 0;
        _.each(pesel, function (a, i) {
            if (i === 10) return;
            number += a * multiples[i];
        });
        control = (number % 10);
        control = (control > 0) ? (10 - control) : control;
        return (control === +pesel[10]);
    }
};

var pesel = "76041219615";
console.log(Pesel.getDateByPesel(pesel));
console.log(Pesel.isValid(pesel));