IMAP date

The imap code below displays the date like this:
Sat, 18 Feb 2012 19:22:02 +0100
I want the date to be displayed like this instead:
2012-02-18

Any idea how I can achieve this?

Thanks in advance

<?php
date_default_timezone_set ("Europe/Stockholm");
/* connect to mail */
$hostname = '{xxx.xxxx.com:143/notls}INBOX';
$username = 'xxxxx@xxxxx.com';
$password = 'xxxxxx';

/* try to connect */
$inbox = imap_open($hostname,$username,$password) or die('Anslutning till mail misslyckades: ' . imap_last_error());

/* grab emails */
$emails = imap_search($inbox,'ALL');

/* if emails are returned, cycle through each... */
if($emails) {
  
  /* begin output var */
  $output = '';
  
  /* put the newest emails on top */
  rsort($emails);
  
  /* for every email... */
  foreach($emails as $email_number) {
    
    /* get information specific to this email */
    $overview = imap_fetch_overview($inbox,$email_number,0);
    $message = imap_fetchbody($inbox,$email_number,2);
    /* output the email header information */
    $output.= '<li>';
    $output.= '<a href="#"><strong>'.$overview[0]->date.'</strong> ';
    $output.= ''.$overview[0]->subject.'<br> ';
    $output.= '<small> Fr&aring;n: '.$overview[0]->from.'</small></a>';
    $output.= '</li>';
    

  }
  
  echo $output;
  
} 

/* close the connection */
imap_close($inbox);


?>

Code (markup):

 

Change this:

$output.= '<a href="#"><strong>'.$overview[0]->date.'</strong> ';

PHP:

To This:

$output.= '<a href="#"><strong>'.date("Y-m-d", strtotime($overview[0]->date)).'</strong> ';

PHP:

 

Thanks ThePHPMaster, you are my hero

 

$output.= ''.$overview[0]->subject.'<br> ';

PHP:

Do you know how I can truncate this line? So that it only echos 3 words.

Thanks in advance