diff --git a/backend/admin.py b/backend/admin.py
index ec9c314..ae72736 100644
--- a/backend/admin.py
+++ b/backend/admin.py
@@ -47,6 +47,8 @@ async def read_api_keys(
             item.tokens_used_month = usage.tokens_used_month or 0
             item.requests_today = usage.requests_today or 0
             item.requests_month = usage.requests_month or 0
+            item.daily_reset_at = usage.daily_reset_at
+            item.monthly_reset_at = usage.monthly_reset_at
         result.append(item)
     return result
 
diff --git a/backend/schemas.py b/backend/schemas.py
index 15cf563..7fe788a 100644
--- a/backend/schemas.py
+++ b/backend/schemas.py
@@ -58,6 +58,8 @@ class APIKeyWithUsage(APIKey):
     tokens_used_month: int = 0
     requests_today: int = 0
     requests_month: int = 0
+    daily_reset_at: Optional[datetime] = None
+    monthly_reset_at: Optional[datetime] = None
 
     class Config:
         from_attributes = True
\ No newline at end of file
diff --git a/frontend/src/main.jsx b/frontend/src/main.jsx
index cc5a985..0b66f63 100644
--- a/frontend/src/main.jsx
+++ b/frontend/src/main.jsx
@@ -11,17 +11,28 @@ function authHeaders(token) {
 
 const fmtK = (n) => { const k = n / 1000; return k % 1 === 0 ? `${k}k` : `${k.toFixed(1)}k`; };
 
-function QuotaBar({ used, limit, isToken = false }) {
-  if (limit == null) return <span className="quota-unlimited">∞</span>;
+function QuotaBar({ used, limit, isToken = false, since = null }) {
+  const fmt = isToken ? fmtK : (n) => n.toLocaleString('de-DE');
+  const sinceLabel = since
+    ? new Date(since).toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit' })
+    : null;
+
+  if (limit == null) return (
+    <div className="quota-cell">
+      <span className="quota-unlimited">∞</span>
+      {sinceLabel && <span className="quota-since">seit {sinceLabel}</span>}
+    </div>
+  );
+
   const pct = Math.min(100, (used / limit) * 100);
   const color = pct >= 90 ? '#e74c3c' : pct >= 70 ? '#e67e22' : '#27ae60';
-  const fmt = isToken ? fmtK : (n) => n.toLocaleString('de-DE');
   return (
     <div className="quota-cell">
       <span className="quota-label">{fmt(used)} / {fmt(limit)}</span>
       <div className="progress-bar">
         <div className="progress-fill" style={{ width: `${pct}%`, backgroundColor: color }} />
       </div>
+      {sinceLabel && <span className="quota-since">seit {sinceLabel}</span>}
     </div>
   );
 }
@@ -400,10 +411,10 @@ function App() {
                 <td>{key.name}</td>
                 <td>{displayKey(key.key_prefix)}</td>
                 <td>{key.expires_at ? new Date(key.expires_at).toLocaleDateString('de-DE', { timeZone: 'Europe/Berlin' }) : '∞'}</td>
-                <td><QuotaBar used={key.tokens_used_today} limit={key.daily_tokens} isToken /></td>
-                <td><QuotaBar used={key.tokens_used_month} limit={key.monthly_tokens} isToken /></td>
-                <td><QuotaBar used={key.requests_today} limit={key.daily_requests} /></td>
-                <td><QuotaBar used={key.requests_month} limit={key.monthly_requests} /></td>
+                <td><QuotaBar used={key.tokens_used_today} limit={key.daily_tokens} isToken since={key.daily_reset_at} /></td>
+                <td><QuotaBar used={key.tokens_used_month} limit={key.monthly_tokens} isToken since={key.monthly_reset_at} /></td>
+                <td><QuotaBar used={key.requests_today} limit={key.daily_requests} since={key.daily_reset_at} /></td>
+                <td><QuotaBar used={key.requests_month} limit={key.monthly_requests} since={key.monthly_reset_at} /></td>
                 <td className="action-cell">
                   <button className="btn-icon btn-icon-edit" data-tooltip="Bearbeiten" onClick={() => handleEdit(key)}>✏</button>
                   {key.is_active ? (
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index 333d37c..0c76504 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -246,6 +246,13 @@ tr:hover {
   font-size: 14px;
 }
 
+.quota-since {
+  display: block;
+  font-size: 10px;
+  color: #aaa;
+  margin-top: 2px;
+}
+
 .progress-bar {
   height: 4px;
   background: #e2e8f0;