Problem with Javascript Date function in IE 7, returns NaN

You'll want to make sure the date is parsed as UTC, because otherwise javascript will interpret it as a date in your local timezone.

The date looks like this: Tue Jul 13 23:18:36 +0000 2010

You can parse it like this:

function parseDate(str) {  var v=str.split(' ');  return new Date(Date.parse(v[1]+" "+v[2]+", "+v[5]+" "+v[3]+" UTC"));} 

Which will give the correct date/time in the local timezone, for example: Tue Jul 13 2010 19:18:36 GMT-0400 (EDT)

So that should leave your code looking something like this:

$(function(){  $.getJSON("http://twitter.com/statuses/user_timeline/google.json?count=1&callback=?", function(data){    $.each(data, function(){      var created = parseDate(this.created_at);      $("<div></div>").append("<ul><li>Unformatted: " + this.created_at + "</li><li>Formatted: " + created + "</li></ul>").appendTo("body");    });  });  function parseDate(str) {    var v=str.split(' ');    return new Date(Date.parse(v[1]+" "+v[2]+", "+v[5]+" "+v[3]+" UTC"));  } });

I've found the jQuery Globalization Plugin date parsing to work best. Other methods had cross-browser issues and stuff like date.js had not been updated in quite a while.

You also don't need a datePicker on the page. You can just call something similar to the example given in the docs:

$.parseDate('yy-mm-dd', '2007-01-26');

Here is what I made to correct this!

$tweetList.append('<p><span class="twitterdate">' + parseTwitterDate(item.created_at) + location + '</span></p>');var month=new Array();month[0]="January";month[1]="February";month[2]="March";month[3]="April";month[4]="May";month[5]="June";month[6]="July";month[7]="August";month[8]="September";month[9]="October";month[10]="November";month[11]="December";function parseTwitterDate($stamp) {    var v=$stamp.split(' ');    var date = new Date(Date.parse(v[1]+" "+v[2]+", "+v[5]+" "+v[3]+" UTC"));    var hour = date.getHours();    var ampm = hour<12 ? ' AM' : ' PM';    return date.getHours() +':'+ date.getMinutes() +' '+ ampm +' '+ date.getDate() +' '+ month[date.getMonth()] +' '+ date.getFullYear();}

And this give me "19:38 PM 23 April 2012" on Chrome, IE and Firefox.