diff --git a/srv/poe_manager/templates/logs.html b/srv/poe_manager/templates/logs.html
index 5d9ab07..3e24d81 100644
--- a/srv/poe_manager/templates/logs.html
+++ b/srv/poe_manager/templates/logs.html
@@ -16,7 +16,6 @@
 
 <script>
 function parseLogTimestamp(ts) {
-    // ts = "2025-10-08 16:48:16"
     const parts = ts.match(/^(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})$/);
     if (!parts) return Date.now();
     const [, year, month, day, hour, minute, second] = parts.map(Number);
@@ -65,9 +64,9 @@ document.addEventListener("DOMContentLoaded", () => {
 
     function updateTimer() {
         const now = Date.now();
-        const nextRefresh = lastUpdateTime + intervalMilliseconds;
-        const remainingMs = nextRefresh - now;
-        const remainingSec = Math.max(Math.ceil(remainingMs / 1000), 0);
+        const elapsed = now - lastUpdateTime;
+        const remainingMs = intervalMilliseconds - (elapsed % intervalMilliseconds);
+        const remainingSec = Math.ceil(remainingMs / 1000);
         document.getElementById("timer").innerText = remainingSec;
     }
 
@@ -77,7 +76,6 @@ document.addEventListener("DOMContentLoaded", () => {
     setInterval(fetchLog, intervalMilliseconds);
     setInterval(updateTimer, 1000);
 });
-
 </script>
 
 {% endblock %}