function dateTime(){
    var date = new Date();
    var hours = date.getHours();
    var minutes = date.getMinutes();
    var seconds = date.getSeconds();
    var days = date.getDate();
    var months = date.getMonth();
    var years = date.getYear();
    var day = date.getDay();
/*
    var daysInWeek = new Array(
        'Neděle','Pondělí','Úterý','Středa','Čtvrtek','Pátek','Sobota'
    );
*/
    if(hours < 10){
        hours = '0' + hours;
    }
    if(minutes < 10){
        minutes = '0' + minutes;
    }
    if(seconds < 10){
        seconds = '0' + seconds;
    }
    months = months + 1;
    if(years < 1000){
        years = years + 1900;
    }
    
    var dc = document.getElementById("datumcas");
    if(dc) {
        dc.value = daysInWeek[day] + " " + days + '. ' + months + '. ' + years + ' ' +hours + ':' + minutes + ':' + seconds;
    }
}
function setDateTime(){
    setInterval('dateTime()',1000);
}

addLoadEvent(setDateTime);