diff --git a/src/main.js b/src/main.js
index bf127b3..926e89a 100644
--- a/src/main.js
+++ b/src/main.js
@@ -459,6 +459,9 @@ function buildUI(state) {
           <span class="text-gray-500">History: ${CONFIG.historyDuration}s</span> |
           <span id="status-indicator" class="text-green-400">Running</span>
         </p>
+        <p class="text-gray-500 text-xs font-mono mt-1">
+          <span id="clock-local"></span> | <span id="clock-utc"></span>
+        </p>
         <div id="health-box" class="mt-4 p-3 bg-gray-800/70 rounded-lg border border-gray-700/50 font-mono text-sm text-center">
           <span id="health-text" class="text-gray-400">Waiting for data...</span>
         </div>
@@ -721,6 +724,16 @@ async function init() {
         .getElementById("pause-btn")
         .addEventListener("click", () => togglePause(state));
 
+    function updateClocks() {
+        const now = new Date();
+        const utc = now.toISOString().replace(/\.\d{3}Z$/, "Z");
+        const local = now.toLocaleString("sv-SE", { hour12: false });
+        document.getElementById("clock-local").textContent = "Local: " + local;
+        document.getElementById("clock-utc").textContent = "UTC: " + utc;
+    }
+    updateClocks();
+    setInterval(updateClocks, 1000);
+
     tick(state);
     setInterval(() => tick(state), CONFIG.updateInterval);