diff --git a/gerbil-manager-web/e2e/stammbaum.spec.ts b/gerbil-manager-web/e2e/stammbaum.spec.ts
index 2f55793..cfdf83a 100644
--- a/gerbil-manager-web/e2e/stammbaum.spec.ts
+++ b/gerbil-manager-web/e2e/stammbaum.spec.ts
@@ -137,3 +137,11 @@ test('Kein Würfe-Panel wenn Wurzeltier keine Würfe hat (STAMMBAUM-LITTERS)', a
   await expect(page.locator('.pedigree-card').first()).toBeVisible()
   await expect(page.locator('.stammbaum-litters-panel')).not.toBeVisible()
 })
+
+test('Knoten-Karte zeigt volles Geburtsdatum (STAMMBAUM-FULLDATE)', async ({ page }) => {
+  skipUnlessMock()
+  // Krümel: dateOfBirth '2025-03-12' → formatDate → '12.03.2025'
+  await page.goto('/rennmaeuse/kruemel/stammbaum')
+  await expect(page.locator('.pedigree-card').first()).toBeVisible()
+  await expect(page.locator('.pedigree-card__year').first()).toContainText('12.03.2025')
+})
diff --git a/gerbil-manager-web/src/pages/StammbaumPage.tsx b/gerbil-manager-web/src/pages/StammbaumPage.tsx
index 120051c..a09240a 100644
--- a/gerbil-manager-web/src/pages/StammbaumPage.tsx
+++ b/gerbil-manager-web/src/pages/StammbaumPage.tsx
@@ -379,7 +379,7 @@ function PedigreeCard({
   const t = de.pages.stammbaum
   const g = node.gerbil
   const chip = farbschlag ? chipColorFor(farbschlag) : null
-  const year = g.dateOfBirth ? g.dateOfBirth.slice(0, 4) : null
+  const dob = g.dateOfBirth ? formatDate(g.dateOfBirth) : null
   return (
     <div
       className={isRoot ? 'pedigree-card pedigree-card--root' : 'pedigree-card'}
@@ -410,7 +410,7 @@ function PedigreeCard({
             {farbschlag}
           </span>
         )}
-        {year && <span className="pedigree-card__year">* {year}</span>}
+        {dob && <span className="pedigree-card__year">* {dob}</span>}
       </div>
       {node.expandable && (
         <button