diff --git a/tournaments/templates/register_tournament.html b/tournaments/templates/register_tournament.html
index 91117e8..eda6feb 100644
--- a/tournaments/templates/register_tournament.html
+++ b/tournaments/templates/register_tournament.html
@@ -38,7 +38,7 @@
                         <p>Votre session d'inscription est active. Complétez le formulaire dans le délai accordé pour confirmer votre participation et garantir votre place.</p>
                         {% if not cart_data.is_cart_expired %}
                                 <p class="semibold highlight">Votre session d'inscription expirera le {{ cart_data.expiry|date:"d/m/Y à H:i" }}</p>
-                                <p>Temps restant: <span id="countdown" data-expiry="{{ cart_data.expiry|date:'Y-m-d H:i:s' }}">{{ cart_data.expiry|timeuntil }}</span></p>
+                                <p>Temps restant: <span id="countdown" data-expiry="{{ cart_data.expiry|date:'U' }}">{{ cart_data.expiry|timeuntil }}</span></p>
                         {% else %}
                             <p class="alert alert-danger">
                             Votre session d'inscription a expiré. Veuillez recommencer le processus d'inscription. Votre place n'est plus garantie.
@@ -236,18 +236,12 @@ document.addEventListener('DOMContentLoaded', function() {
         return;
     }
 
-    // Get the expiry date from the data attribute
-    const expiryDateStr = countdownElement.getAttribute('data-expiry');
-    if (!expiryDateStr) return;
+    // Get the expiry date from the data attribute (Unix timestamp)
+    const expiryTimestamp = countdownElement.getAttribute('data-expiry');
+    if (!expiryTimestamp) return;
 
-    // Parse the expiry date properly (keeping local time interpretation)
-    // Format received: "YYYY-MM-DD HH:MM:SS"
-    const [datePart, timePart] = expiryDateStr.split(' ');
-    const [year, month, day] = datePart.split('-').map(Number);
-    const [hours, minutes, seconds] = timePart.split(':').map(Number);
-
-    // Create date object using local time components (month is 0-indexed in JS)
-    const expiryDate = new Date(year, month-1, day, hours, minutes, seconds);
+    // Convert Unix timestamp to Date object
+    const expiryDate = new Date(parseInt(expiryTimestamp) * 1000);
 
     // Function to update countdown text
     function updateCountdown() {