diff --git a/html/admin.html b/html/admin.html
index 043ec44..35b78ed 100755
--- a/html/admin.html
+++ b/html/admin.html
@@ -211,22 +211,33 @@
             <h3 class="mt-4">Clock</h3>
 
               <div class="mb-3">
-                <label for="sys_local_time" class="form-label">System time (local)</label>
-                <input type="text" class="form-control" id="sys_local_time" disabled>
-                <small class="text-muted">Horloge Linux du Raspberry Pi. Se synchronise via internet (NTP). Non utilisee par le capteur.</small>
-              </div>
-
-              <div class="mb-3">
-                <label for="sys_UTC_time" class="form-label">System time (UTC)</label>
-                <input type="text" class="form-control" id="sys_UTC_time" disabled>
-              </div>
-
-              <div class="mb-3">
-                <label for="RTC_utc_time" class="form-label">RTC time (UTC)</label>
-                <input type="text" class="form-control" id="RTC_utc_time" disabled>
+                <label for="RTC_utc_time" class="form-label fw-bold fs-5">RTC time (UTC)</label>
+                <input type="text" class="form-control form-control-lg border-primary" id="RTC_utc_time" disabled>
                 <small class="text-muted">Module DS3231 avec pile de sauvegarde. Garde l'heure meme hors tension. Horloge de reference du capteur.</small>
               </div>
 
+              <div class="mb-3">
+                <label for="browser_utc_time" class="form-label">Browser time (UTC)</label>
+                <input type="text" class="form-control" id="browser_utc_time" disabled>
+                <small class="text-muted">Heure de votre appareil (PC/Mac/tablette). Reference pour verifier le RTC.</small>
+              </div>
+
+              <hr>
+              <details class="mb-3">
+                <summary class="text-muted" style="cursor:pointer;">System time (non utilise par le capteur)</summary>
+                <div class="mt-2">
+                  <div class="mb-3">
+                    <label for="sys_local_time" class="form-label">System time (local)</label>
+                    <input type="text" class="form-control form-control-sm" id="sys_local_time" disabled>
+                  </div>
+                  <div class="mb-3">
+                    <label for="sys_UTC_time" class="form-label">System time (UTC)</label>
+                    <input type="text" class="form-control form-control-sm" id="sys_UTC_time" disabled>
+                  </div>
+                  <small class="text-muted">Horloge Linux du Raspberry Pi. Se synchronise via internet (NTP). Non utilisee par le capteur.</small>
+                </div>
+              </details>
+
 
               <div id="alert_container"></div>
 
@@ -588,13 +599,22 @@ window.onload = function() {
                     document.getElementById("sys_UTC_time").value = response.system_utc_time;
                     document.getElementById("RTC_utc_time").value = response.rtc_module_time;
 
-                    // Compare RTC time with browser time (more reliable than system time)
+                    // Display browser time in UTC
+                    const browserDate = new Date();
+                    const browserUTC = browserDate.getUTCFullYear() + '-' +
+                      String(browserDate.getUTCMonth() + 1).padStart(2, '0') + '-' +
+                      String(browserDate.getUTCDate()).padStart(2, '0') + ' ' +
+                      String(browserDate.getUTCHours()).padStart(2, '0') + ':' +
+                      String(browserDate.getUTCMinutes()).padStart(2, '0') + ':' +
+                      String(browserDate.getUTCSeconds()).padStart(2, '0');
+                    document.getElementById("browser_utc_time").value = browserUTC;
+
+                    // Compare RTC time with browser time
                       const alertContainer = document.getElementById("alert_container");
                       alertContainer.innerHTML = "";
 
                       if (response.rtc_module_time) {
                         const rtcDate = new Date(response.rtc_module_time + ' UTC');
-                        const browserDate = new Date();
                         const timeDiff = Math.abs(Math.round((browserDate - rtcDate) / 1000));
 
                         if (timeDiff <= 30) {