The solution to your problem is at: Parse RSS pubDate to Date object in JavaScript
In order to also get the hours:
var pubDate = "Sun, 27 Mar 2011 20:17:21 +0100";
var date = new Date(pubDate);
var months = Array("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
var string = date.getDate() + " " + months[date.getMonth()] + " " + date.getFullYear()
var time = date.getHours()+":"+date.getMinutes();
alert(string+"\n"+time);