function fourdigits(number)	{
  return (number < 1000) ? number + 1900 : number;
}

function retornaData() {
	var now = new Date();
    var date = ((now.getDate()<10) ? "0" : "")+ now.getDate();
    today =  date + '/' + (now.getMonth()+1) + '/' +  (fourdigits(now.getYear())) + ' ' + now.getHours() + ':' + now.getMinutes() + ':' + now.getSeconds();
	document.write(today);
}