Hello Amaury Dubois
Please help me find and open file: modules/mod_jo_facebook_events_pro/tmpl/default.php and go to line 121 and change
<em class="evo_date"><?php echo date('d', strtotime($fbevent["start_time"]))?><span><?php if(@$fbevent["end_time"] !=""){?> - <?php echo date('d', strtotime($fbevent["end_time"]))?><?php }?></span></em>
To
<em class="evo_date"><?php echo date('d', strtotime($fbevent["start_time"]))?></em>
Or can you send me joomla admin via contact form? So we can help you
Best regards
Bach Pham