node--blog.tpl.php
<span class="date"><?php print format_date($created, $type = 'blog');?>
instead of
<span class="date"><?php print date("d", $created);?> <?php print date("M", $created);?></span>
Thanks to this translation will be automatically provided and result will be more elastic.
Warning!
In example above user must define 'blog' format www.yourdomain.com/admin/config/regional/date-time
By default you should use 'short', which is predefined.