diff --git a/site/plugins/helpers/index.php b/site/plugins/helpers/index.php
index fb94ee8..ec46509 100644
--- a/site/plugins/helpers/index.php
+++ b/site/plugins/helpers/index.php
@@ -174,10 +174,19 @@ function saveMapadoEvent($mapadoEvent, $page) {
 
 function getEndTime($session) {
   $formattedTime = strlen($session['time']) < 4 ? $session['time'] . '00' : $session['time'];
-  $time1 = DateTime::createFromFormat('G\hi', $formattedTime);
+  $time1 = DateTime::createFromFormat('Hi', $formattedTime);
+  if ($time1 === false) {
+    throw new Exception('format d\'heure invalide : ' . $session['time']);
+  }
+  
   $formattedDuration = strlen($session['duration']) < 4 ? $session['duration'] . '00' : $session['duration'];
-  $time2 = DateTime::createFromFormat('G\hi', $formattedDuration);
+  $time2 = DateTime::createFromFormat('Hi', $formattedDuration);
+  if ($time2 === false) {
+    throw new Exception('format de durée invalide : ' . $session['duration']);
+  }
+  
   $time1->add(new DateInterval('PT' . $time2->format('H') . 'H' . $time2->format('i') . 'M'));
-  $endTime = $time1->format('G\hi');
-  return $endTime;
+
+  return $time1->format('H:i');
 }
+
diff --git a/site/templates/program.php b/site/templates/program.php
index e0d2d1b..f1a56cc 100644
--- a/site/templates/program.php
+++ b/site/templates/program.php
@@ -76,7 +76,7 @@
                       try {
                         $endTime = strlen($session['duration']) > 0 ? getEndTime($session) : false;
                       } catch (\Throwable $th) {
-                        throw new Exception($session['title'], 1);
+                        throw new Exception($session['title'] .' - ' . $th->getMessage(), 1);
                       }
                   ?>
                     <template x-if="tab === 'Calendrier' || ('<?= $session['categories'] ?>'.length > 0 && tab.includes('<?= $session['categories'] ?>'))">