I'm calling in a RSS feed to my website using PHP. Currently my code below is calling in the entire contents for pubDate:

<pubDate>Thu, 12 Sep 2013 07:23:59 +0000</pubDate>

How do I just display the day and month from the above example i.e. 12 Sep?

EDIT

I should clarify, the above line of code is an example output I currently get but as I'm calling the latest 3 posts from an RSS feed, this date and time will vary. I therefore need the code to be more dynamic (if that's the right term!)

This code is my full code that fetches the contents of an RSS feed:

<?php
$counter = 0;
$xml=simplexml_load_file("http://tutorial.world.edu/feed/");
foreach ($xml->channel->item as $item) {
    $title = (string) $item->title; // Title Post
    $link   = (string) $item->link; // Url Link
    $pubDate   = (string) $item->pubDate; // date
    $description = (string) $item->description; //Description Post

    echo '<div class="display-rss-feed"><a href="'.$link.'" target="_blank" title="" >'.$title.' </a><br/><br/>';
    echo $description.'<hr><p style="background-color:#e4f;">'.$pubDate.'</p></div>';

    if($counter == 2 ) {
        break;
    } else {
        $counter++;
    }

} ?>