diff --git a/frontend/src/pages/Atemschutz.tsx b/frontend/src/pages/Atemschutz.tsx
index 8f1e1fe..02b5e1d 100644
--- a/frontend/src/pages/Atemschutz.tsx
+++ b/frontend/src/pages/Atemschutz.tsx
@@ -68,10 +68,12 @@ function formatDate(iso: string | null): string {
 /** Extract YYYY-MM-DD from an ISO timestamp or date string for <input type="date"> */
 function toInputDate(iso: string | null | undefined): string {
   if (!iso) return '';
-  // Already YYYY-MM-DD
-  if (/^\d{4}-\d{2}-\d{2}$/.test(iso)) return iso;
-  // Full ISO timestamp — take the first 10 chars (YYYY-MM-DD)
-  return iso.substring(0, 10);
+  // Already DD.MM.YYYY
+  if (/^\d{2}\.\d{2}\.\d{4}$/.test(iso)) return iso;
+  // YYYY-MM-DD → DD.MM.YYYY
+  const m = iso.match(/^(\d{4})-(\d{2})-(\d{2})/);
+  if (m) return `${m[3]}.${m[2]}.${m[1]}`;
+  return '';
 }
 
 function getDisplayName(item: AtemschutzUebersicht): string {
@@ -255,17 +257,24 @@ function Atemschutz() {
     setForm((prev) => ({ ...prev, [field]: value }));
   };
 
-  /** Normalize dates before submit: ensure 4-digit years, drop invalid values */
+  /** Normalize dates before submit: parse DD.MM.YYYY or YYYY-MM-DD → YYYY-MM-DD for API */
   const normalizeDate = (val: string | undefined): string | undefined => {
     if (!val) return undefined;
-    // Match YYYY-MM-DD but with potentially short year
-    const m = val.match(/^(\d{1,4})-(\d{2})-(\d{2})$/);
-    if (!m) return undefined;
-    const year = m[1].padStart(4, '0');
-    // Reject obviously wrong years (< 1900 or > 2100)
-    const y = parseInt(year, 10);
-    if (y < 1900 || y > 2100) return undefined;
-    return `${year}-${m[2]}-${m[3]}`;
+    // DD.MM.YYYY format (German)
+    const dmy = val.match(/^(\d{1,2})\.(\d{1,2})\.(\d{4})$/);
+    if (dmy) {
+      const y = parseInt(dmy[3], 10);
+      if (y < 1900 || y > 2100) return undefined;
+      return `${dmy[3]}-${dmy[2].padStart(2, '0')}-${dmy[1].padStart(2, '0')}`;
+    }
+    // YYYY-MM-DD format (ISO)
+    const iso = val.match(/^(\d{4})-(\d{2})-(\d{2})$/);
+    if (iso) {
+      const y = parseInt(iso[1], 10);
+      if (y < 1900 || y > 2100) return undefined;
+      return val;
+    }
+    return undefined;
   };
 
   const handleSubmit = async () => {
@@ -643,10 +652,10 @@ function Atemschutz() {
                   label="Lehrgang Datum"
                   size="small"
                   fullWidth
-                  placeholder="JJJJ-MM-TT"
+                  placeholder="TT.MM.JJJJ"
                   value={form.lehrgang_datum}
                   onChange={(e) => handleFormChange('lehrgang_datum', e.target.value)}
-                  helperText="Format: 2025-03-01"
+                  helperText="Format: 01.03.2025"
                   InputLabelProps={{ shrink: true }}
                 />
               </Grid>
@@ -662,10 +671,10 @@ function Atemschutz() {
                   label="Untersuchung Datum"
                   size="small"
                   fullWidth
-                  placeholder="JJJJ-MM-TT"
+                  placeholder="TT.MM.JJJJ"
                   value={form.untersuchung_datum}
                   onChange={(e) => handleFormChange('untersuchung_datum', e.target.value)}
-                  helperText="Format: 2023-02-08"
+                  helperText="Format: 08.02.2023"
                   InputLabelProps={{ shrink: true }}
                 />
               </Grid>
@@ -674,10 +683,10 @@ function Atemschutz() {
                   label="Gültig bis"
                   size="small"
                   fullWidth
-                  placeholder="JJJJ-MM-TT"
+                  placeholder="TT.MM.JJJJ"
                   value={form.untersuchung_gueltig_bis}
                   onChange={(e) => handleFormChange('untersuchung_gueltig_bis', e.target.value)}
-                  helperText="Format: 2028-02-08"
+                  helperText="Format: 08.02.2028"
                   InputLabelProps={{ shrink: true }}
                 />
               </Grid>
@@ -712,10 +721,10 @@ function Atemschutz() {
                   label="Leistungstest Datum"
                   size="small"
                   fullWidth
-                  placeholder="JJJJ-MM-TT"
+                  placeholder="TT.MM.JJJJ"
                   value={form.leistungstest_datum}
                   onChange={(e) => handleFormChange('leistungstest_datum', e.target.value)}
-                  helperText="Format: 2025-08-25"
+                  helperText="Format: 25.08.2025"
                   InputLabelProps={{ shrink: true }}
                 />
               </Grid>
@@ -724,10 +733,10 @@ function Atemschutz() {
                   label="Gültig bis"
                   size="small"
                   fullWidth
-                  placeholder="JJJJ-MM-TT"
+                  placeholder="TT.MM.JJJJ"
                   value={form.leistungstest_gueltig_bis}
                   onChange={(e) => handleFormChange('leistungstest_gueltig_bis', e.target.value)}
-                  helperText="Format: 2026-08-25"
+                  helperText="Format: 25.08.2026"
                   InputLabelProps={{ shrink: true }}
                 />
               </Grid>