diff --git a/frontend/src/tools/statistik.jsx b/frontend/src/tools/statistik.jsx
index 398d34e..cb6cf83 100644
--- a/frontend/src/tools/statistik.jsx
+++ b/frontend/src/tools/statistik.jsx
@@ -70,7 +70,12 @@ function periodRange(id, custom) {
   const now = new Date();
   const pad = n => String(n).padStart(2,'0');
   const iso = d => `${d.getFullYear()}-${pad(d.getMonth()+1)}-${pad(d.getDate())}`;
-  if (id==='week')  { const d=new Date(now); d.setDate(d.getDate()-6); return { from:iso(d), to:iso(now) }; }
+  if (id==='week')  {
+    const d = new Date(now);
+    const day = d.getDay() || 7; // 1=Mo … 7=So
+    d.setDate(d.getDate() - (day - 1)); // zurück auf Montag
+    return { from:iso(d), to:iso(now) };
+  }
   if (id==='month') { const d=new Date(now.getFullYear(),now.getMonth(),1); return { from:iso(d), to:iso(now) }; }
   if (id==='year')  { return { from:`${now.getFullYear()}-01-01`, to:iso(now) }; }
   if (id==='custom' && custom) {