function PrintDate(pripoctiDny) {
    if(isNaN(pripoctiDny)) {
        pripoctiDny = 0;   
    }
    var now = new Date();
    now.setDate(now.getDate()+pripoctiDny);
    var Yr = now.getFullYear();
    var MonthNr = now.getMonth()+1;
    var DayNr = now.getDate();
    
    
    // String pro zobrazeni data
    var stringDate =(DayNr + ". " + MonthNr + ". " + Yr);

    // Vypsani data na stranku

    document.write(stringDate);
}