diff --git a/templates/index.html b/templates/index.html
index 5b877ef..7e16527 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -21,6 +21,7 @@
     </div>
 
     <div id="controls" class="field is-grouped is-align-items-center mb-4" style="position: sticky; top: 0; background: white; z-index: 2; padding: 0.5rem 0;">
+      <!-- Hidden native interval control kept for compatibility and availability probing -->
       <div id="interval-control" class="control has-icons-left is-hidden">
         <div class="select is-small">
           <select id="interval-select">
@@ -42,17 +43,20 @@
         </div>
         <span class="icon is-small is-left"><img src="icons/server.svg" alt="Domain"></span>
       </div>
-      <div id="window-control" class="control has-icons-left is-hidden">
+      <!-- Unified Time control: selects both range and sensible grouping -->
+      <div id="time-control" class="control has-icons-left is-hidden">
         <div class="select is-small">
-          <select id="window-select">
-            <option value="1h">Last 1h</option>
-            <option value="24h">Last 24h</option>
-            <option value="7d" selected>Last 7d</option>
-            <option value="30d">Last 30d</option>
-            <option value="all">All</option>
+          <select id="time-select">
+            <option value="1h">Last hour</option>
+            <option value="24h">Last 24 hours</option>
+            <option value="7d" selected>Last 7 days</option>
+            <option value="30d">Last 30 days</option>
+            <option value="12w">Last 12 weeks</option>
+            <option value="12m">Last 12 months</option>
+            <option value="all">All time</option>
           </select>
         </div>
-        <span class="icon is-small is-left"><img src="icons/pulse.svg" alt="Window"></span>
+        <span class="icon is-small is-left"><img src="icons/clock.svg" alt="Time"></span>
       </div>
       <div id="smooth-control" class="control is-hidden">
         <label class="checkbox is-small">
@@ -130,7 +134,8 @@
     const domainSelect = document.getElementById('domain-select');
     const intervalControl = document.getElementById('interval-control');
     const domainControl = document.getElementById('domain-control');
-    const windowControl = document.getElementById('window-control');
+    const timeControl = document.getElementById('time-control');
+    const timeSelect = document.getElementById('time-select');
     const modePercentControl = document.getElementById('mode-percent-control');
     const modeGroupControl = document.getElementById('mode-group-control');
     const excludeUncachedControl = document.getElementById('exclude-uncached-control');
@@ -163,7 +168,25 @@
     const elapsedElem = document.getElementById('stat-elapsed');
 
     // Extra controls
+    // Legacy window select kept for internal state only (not shown)
     const windowSelect = document.getElementById('window-select');
+    
+    // If legacy window select is not present in DOM, create a hidden one for code paths
+    // that still reference it.
+    (function ensureHiddenWindowSelect(){
+      if (!windowSelect) {
+        const hidden = document.createElement('select');
+        hidden.id = 'window-select';
+        hidden.classList.add('is-hidden');
+        // Supported values used by code
+        ['1h','24h','7d','30d','12w','12m','all'].forEach(v => {
+          const o = document.createElement('option');
+          o.value = v; o.textContent = v;
+          hidden.appendChild(o);
+        });
+        document.body.appendChild(hidden);
+      }
+    })();
     const percentToggle = document.getElementById('percent-toggle');
     const groupToggle = document.getElementById('group-toggle');
     const excludeUncachedToggle = document.getElementById('exclude-uncached-toggle');
@@ -172,7 +195,7 @@
     let currentInterval = intervalSelect.value;
     let currentDomain = domainSelect.value;
     let currentTab = 'recent';
-    let currentWindow = windowSelect.value; // 1h, 24h, 7d, 30d, all
+    let currentWindow = windowSelect ? windowSelect.value : '7d'; // 1h, 24h, 7d, 30d, 12w, 12m, all
     let modePercent = false;
     let modeGroup = true;
     let excludeUncached = true;
@@ -241,10 +264,46 @@
         case '24h': return interval === 'hourly' ? 24 : 'all';
         case '7d': return interval === 'daily' ? 7 : 'all';
         case '30d': return interval === 'daily' ? 30 : 'all';
+        case '12w': return interval === 'weekly' ? 12 : 'all';
+        case '12m': return interval === 'monthly' ? 12 : 'all';
         default: return 'all';
       }
     }
 
+    function availableIntervals() {
+      try {
+        return Array.from(intervalSelect ? intervalSelect.options : []).map(o => o.value);
+      } catch { return []; }
+    }
+
+    function pickIntervalForWindow(win) {
+      const avail = availableIntervals();
+      const pref = (list) => list.find(x => avail.includes(x));
+      switch (win) {
+        case '1h':
+        case '24h':
+          return pref(['hourly','daily','weekly','monthly']) || (avail[0] || 'daily');
+        case '7d':
+        case '30d':
+          return pref(['daily','weekly','monthly','hourly']) || (avail[0] || 'daily');
+        case '12w':
+          return pref(['weekly','daily','monthly']) || (avail[0] || 'weekly');
+        case '12m':
+          return pref(['monthly','weekly','daily']) || (avail[0] || 'monthly');
+        default:
+          // all time: favor coarser buckets if available
+          return pref(['monthly','weekly','daily','hourly']) || (avail[0] || 'weekly');
+      }
+    }
+
+    function applyTimePreset(win) {
+      currentWindow = win;
+      currentInterval = pickIntervalForWindow(win);
+      if (intervalSelect) intervalSelect.value = currentInterval;
+      const winSel = document.getElementById('window-select');
+      if (winSel) winSel.value = currentWindow;
+    }
+
     function initReport(token, rep, base) {
       fetch(base + '/' + rep.json, { signal: token.controller.signal })
         .then(r => r.json())
@@ -517,11 +576,12 @@
       Object.entries(sections).forEach(([key, section]) => {
         section.classList.toggle('is-hidden', key !== name);
       });
-      const showInterval = name !== 'recent' && name !== 'analysis';
-      const showDomain = showInterval;
-      intervalControl.classList.toggle('is-hidden', !showInterval);
+      const showTime = name !== 'recent' && name !== 'analysis';
+      const showDomain = showTime;
+      // Always keep legacy interval control hidden; use unified time control
+      intervalControl.classList.add('is-hidden');
       domainControl.classList.toggle('is-hidden', !showDomain);
-      windowControl.classList.toggle('is-hidden', !showInterval);
+      timeControl.classList.toggle('is-hidden', !showTime);
       // Only show percent/group/exclude toggles on Distribution tab,
       // and smoothing only on Trends tab
       modePercentControl.classList.toggle('is-hidden', name !== 'distribution');
@@ -539,13 +599,15 @@
       }
     }
 
-    intervalSelect.addEventListener('change', () => {
-      currentInterval = intervalSelect.value;
-      abortLoad(currentLoad);
-      Object.values(containers).forEach(reset);
-      updateURL();
-      loadReports();
-    });
+    if (intervalSelect) {
+      intervalSelect.addEventListener('change', () => {
+        currentInterval = intervalSelect.value;
+        abortLoad(currentLoad);
+        Object.values(containers).forEach(reset);
+        updateURL();
+        loadReports();
+      });
+    }
 
     domainSelect.addEventListener('change', () => {
       currentDomain = domainSelect.value;
@@ -555,12 +617,14 @@
       loadReports();
     });
 
-    windowSelect.addEventListener('change', () => {
-      currentWindow = windowSelect.value;
-      abortLoad(currentLoad);
-      updateURL();
-      loadReports();
-    });
+    if (timeSelect) {
+      timeSelect.addEventListener('change', () => {
+        applyTimePreset(timeSelect.value);
+        abortLoad(currentLoad);
+        updateURL();
+        loadReports();
+      });
+    }
 
     percentToggle.addEventListener('change', () => {
       modePercent = percentToggle.checked;
@@ -602,9 +666,10 @@
       } catch {}
       // Reset to hard defaults
       currentTab = 'recent';
-      currentInterval = intervalSelect.value = intervalSelect.options[0]?.value || currentInterval;
+      currentInterval = intervalSelect ? (intervalSelect.value = intervalSelect.options[0]?.value || currentInterval) : currentInterval;
       currentDomain = domainSelect.value = '';
-      currentWindow = windowSelect.value = '7d';
+      applyTimePreset('7d');
+      if (timeSelect) timeSelect.value = '7d';
       modePercent = percentToggle.checked = false;
       modeGroup = groupToggle.checked = true;
       excludeUncached = excludeUncachedToggle.checked = true;
@@ -616,9 +681,15 @@
     loadSavedState();
     applyURLParams();
     // Sync controls
-    intervalSelect.value = currentInterval;
+    if (intervalSelect) intervalSelect.value = currentInterval;
     domainSelect.value = currentDomain;
-    windowSelect.value = currentWindow;
+    // Sync unified time select based on state
+    if (timeSelect) {
+      const known = new Set(['1h','24h','7d','30d','12w','12m','all']);
+      const pick = known.has(currentWindow) ? currentWindow : 'all';
+      timeSelect.value = pick;
+      applyTimePreset(pick);
+    }
     percentToggle.checked = modePercent;
     groupToggle.checked = modeGroup;
     excludeUncachedToggle.checked = excludeUncached;