diff --git a/templates/index.html b/templates/index.html
index 585d48b..24d7c92 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -3816,11 +3816,17 @@
             keywords: []
         };
 
-        // UTC Clock Update
+        // Clock Update (uses global InterceptTime for timezone/format)
         function updateHeaderClock() {
             const now = new Date();
-            const utc = now.toISOString().substring(11, 19);
-            document.getElementById('headerUtcTime').textContent = utc;
+            const el = document.getElementById('headerUtcTime');
+            const label = document.querySelector('.utc-label');
+            if (typeof InterceptTime !== 'undefined') {
+                if (el) el.textContent = InterceptTime.fullTime(now);
+                if (label) label.textContent = InterceptTime.getLabel() || 'LOCAL';
+            } else {
+                if (el) el.textContent = now.toISOString().substring(11, 19);
+            }
         }
 
         function setActiveModeIndicator(label) {
@@ -3855,8 +3861,12 @@
         }
 
         // Update clock every second
+        window._navClockStarted = true;
         setInterval(updateHeaderClock, 1000);
-        updateHeaderClock();  // Initial call
+        updateHeaderClock();
+        if (typeof InterceptTime !== 'undefined' && InterceptTime.onChange) {
+            InterceptTime.onChange(updateHeaderClock);
+        }
         applyKeyboardAccessibility();
 
         // Pager message filter functions