Получение количества недель, дней(JScript)

var n = (m != 2 ?((m % 2) ^ (m > 7)) + 30 : (!(y % 400) || !(y % 4) && (y % 25) ? 29 : 28));
где m - месяц, y - год

function y2k(number) {
        return (number 1000) ? number + 1900 : number;
}

function getWeek(day,month,year) {
        year = y2k(year);
    var when = new Date(year,month,day);
    var newYear = new Date(year,0,1);
    var offset = 7 + 1 - newYear.getDay();
    if (offset == 8) offset = 1;
    var daynum = ((Date.UTC(y2k(year),when.getMonth(),when.getDate(),0,0,0) - Date.UTC(y2k(year),0,1,0,0,0)) /1000/60/60/24) + 1;
    var weeknum = Math.floor((daynum-offset+7)/7);
    if (weeknum == 0) {
        year--;
        var prevNewYear = new Date(year,0,1);
        var prevOffset = 7 + 1 - prevNewYear.getDay();
        if (prevOffset == 2 || prevOffset == 8) weeknum = 53; else weeknum = 52;
    }
    return weeknum;
}

function y2k(number) {
        return (number 1000) ? number + 1900 : number;
}

function getWeekEUR(day,month,year) {
        year = y2k(year);
        var when = new Date(year,month,day);
    var newYear = new Date(year,0,1);
    var modDay = newYear.getDay();
    if (modDay == 0) modDay=6; else modDay--;

    var daynum = ((Date.UTC(y2k(year),when.getMonth(),when.getDate(),0,0,0) -
                 Date.UTC(y2k(year),0,1,0,0,0)) /1000/60/60/24) + 1;

    if (modDay 4 ) {
        var weeknum = Math.floor((daynum+modDay-1)/7)+1;
    }
    else {
        var weeknum = Math.floor((daynum+modDay-1)/7);
        if (weeknum == 0) {
            year--;
            var prevNewYear = new Date(year,0,1);
            var prevmodDay = prevNewYear.getDay();
            if (prevmodDay == 0) prevmodDay = 6; else prevmodDay--;
            if (prevmodDay 4) weeknum = 53; else weeknum = 52;
        }
    }

    return + weeknum;
}