diff --git a/frontend/app.js b/frontend/app.js
index 73f54e0..223f3b9 100755
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -2161,7 +2161,18 @@ async function renderSettings() {
         const bt = $('aboutBuildTime');
         if (bt) {
           const t = v.buildTime ? new Date(v.buildTime) : null;
-          bt.textContent = t && !isNaN(t) ? t.toLocaleString() : 'unknown';
+          if (t && !isNaN(t)) {
+            // Shown in GMT+8 regardless of device/server timezone, plus build age.
+            const gmt8 = new Date(t.getTime() + 8 * 3600e3).toISOString().replace('T', ' ').slice(0, 16);
+            const s = Math.max(0, Math.floor((Date.now() - t.getTime()) / 1000));
+            const ago = s < 60 ? `${s} second${s === 1 ? '' : 's'} ago`
+              : s < 3600 ? `${Math.floor(s / 60)} minute${Math.floor(s / 60) === 1 ? '' : 's'} ago`
+              : s < 86400 ? `${Math.floor(s / 3600)} hour${Math.floor(s / 3600) === 1 ? '' : 's'} ago`
+              : `${Math.floor(s / 86400)} day${Math.floor(s / 86400) === 1 ? '' : 's'} ago`;
+            bt.textContent = `${gmt8} +08 · built ${ago}`;
+          } else {
+            bt.textContent = 'unknown';
+          }
         }
       }
     } catch { /* offline — leave the static version in place */ }