SOURCE

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};
document.write(y+'/'+m+'/'+d+' '+h+':'+f+':'+s);