diff --git a/containers/libreportal/frontend/components/apps/overview/js/overview-manager.js b/containers/libreportal/frontend/components/apps/overview/js/overview-manager.js
index c2e0c41..be6a851 100644
--- a/containers/libreportal/frontend/components/apps/overview/js/overview-manager.js
+++ b/containers/libreportal/frontend/components/apps/overview/js/overview-manager.js
@@ -441,7 +441,8 @@ class OverviewManager {
         // with no time reads as "any second now", which a 06:00-08:00 window
         // makes untrue for most of the day.
         const win = up.updates && up.updates.auto_window;
-        const winBit = (win && win !== 'always') ? ` during the ${esc(win).replace('-', '–')} window` : '';
+        const winFmt = (this.updater && this.updater.fmtWindow) ? this.updater.fmtWindow(win) : String(win).replace('-', '–');
+        const winBit = (win && win !== 'always') ? ` during the ${esc(winFmt)} window` : '';
         rows.push({
           hue: 'updates', icon: '⬆️', kind: 'ok',
           text: `${pending.length} update${pending.length === 1 ? '' : 's'} installing automatically${winBit}`,
diff --git a/containers/libreportal/frontend/components/updater/js/updater-page.js b/containers/libreportal/frontend/components/updater/js/updater-page.js
index 6ce0ead..8fdf022 100644
--- a/containers/libreportal/frontend/components/updater/js/updater-page.js
+++ b/containers/libreportal/frontend/components/updater/js/updater-page.js
@@ -184,6 +184,23 @@ class UpdaterPage {
     return null;
   }
 
+  // "06:00-08:00" -> "6am–8am";  "22:30-01:15" -> "10:30pm–1:15am".
+  // 24-hour time is unambiguous on paper and ambiguous at a glance: people read
+  // "06:00–08:00" and still have to work out whether that is morning or night.
+  // The config stays 24-hour (one canonical way to type it); only the display
+  // spells it out. Anything that is not a plain HH:MM-HH:MM is passed through.
+  fmtWindow(win) {
+    const m = String(win || '').match(/^(\d{1,2}):(\d{2})-(\d{1,2}):(\d{2})$/);
+    if (!m) return String(win || '').replace('-', '–');
+    const one = (h, mi) => {
+      const H = parseInt(h, 10), M = parseInt(mi, 10);
+      const ap = H < 12 ? 'am' : 'pm';
+      const hh = (H % 12) === 0 ? 12 : (H % 12);
+      return M ? `${hh}:${String(M).padStart(2, '0')}${ap}` : `${hh}${ap}`;
+    };
+    return `${one(m[1], m[2])}–${one(m[3], m[4])}`;
+  }
+
   sevRank(s) {
     const r = { critical: 0, high: 1, medium: 2, low: 3 };
     return r[(s || '').toLowerCase()] ?? 4;
@@ -750,7 +767,7 @@ class UpdaterPage {
     // iv === 0 the policy is moot and claiming otherwise would be a lie.
     // The window says WHEN: checks run all day, installs land inside it.
     const win = this.updates && this.updates.auto_window;
-    const winBit = (win && win !== 'always') ? ` during ${this.escape(win).replace('-', '–')}` : '';
+    const winBit = (win && win !== 'always') ? ` during ${this.escape(this.fmtWindow(win))}` : '';
     const auto = this.apps.filter((a) => a.update_type !== 'manual').length;
     let autoBit = '';
     if (iv === 0 || !this.apps.length) autoBit = '';