SOURCE

function getTime(){
    var myDate = new Date();
    var y = myDate.getFullYear();
    var m = myDate.getMonth()+1;
    var d = myDate.getDate();
    var h = myDate.getHours();
    var f = myDate.getMinutes();
    var s = myDate.getSeconds();
    if(h<10){h='0'+h;}
    if(f<10){f='0'+f;}
    if(s<10){s='0'+s;}
    return y+'/'+m+'/'+d+' '+h+':'+f+':'+s;
}

var times = getTime();
document.write(times);