reverse date time format in php

I have a date format problem with this code in my theme:
where there is $ row-> eventdate it prints out the date from the database in the format as 05-06-2013, but I would like to reverse it in 2013-06-05 this is possible with a function php into the loop?

<?php
if ( in_category('Biglietti concerti') ) {

     echo '<h2 class="heading" style="text-align: center;">';echo "Date concerti ".get_the_title()." ".get_the_time('Y')."</h2>";

     $sql  = "SELECT * FROM wp_events where name  =  '".get_the_title()."' order by eventdate asc ";
     $result = $wpdb->get_results( $sql );

     if ( count($result) > 0 )
     {

         echo '<div class="date"><table><tbody>';

         foreach($result as $row)
         {
             echo '<tr class="vevent">
                 <td><abbr class="dtstart" title="'.$row->eventdate.'T'.$row->time.'">'.$row->eventdate.'</abbr><abbr class="summary" title="'.get_the_title().'"></abbr></td>
                 <td><a href="'.get_permalink().'">'.$row->city.'</a></td>
                 <td><span class="location">'.$row->location.'</span></td>
                 <td><a href="#biglietti concerti">Biglietti</a></td>
                        </tr>
                        ';
        }

        echo '</tbody></table></div>' ;

     } else {
    ?>

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