SOURCE

function getMyTime(){
    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();
    if(f<10){
        f = '0'+f;
    }
    var s = mydate.getSeconds();
    if(s<10){
        s = '0'+s;
    }
    return y+'/'+m+'/'+d+' '+h+':'+f+':'+s;
}
myTime = getMyTime();
alert(myTime)