diff --git a/src/ccma/assets/CHANGELOG.json b/src/ccma/assets/CHANGELOG.json
index 4d52fac..4914c4f 100644
--- a/src/ccma/assets/CHANGELOG.json
+++ b/src/ccma/assets/CHANGELOG.json
@@ -16,6 +16,7 @@
       "Datumseingabe und -anzeige an das Systemformat angepasst; gespeichert wird weiterhin portabel im ISO-Format.",
       "Eine ribbonweite Mitgliederliste mit direktem Zugriff auf alle Akten ergänzt.",
       "Texthintergründe der Dashboard-Karten an die Kartenflächen angeglichen.",
+      "Mitgliederlisten bleiben bei fehlerhaften Datumswerten bedienbar; der Hausmeister meldet die betroffene Akte zur Korrektur.",
       "Hausmeister um konfigurierbare Geburtstags- und Mitgliedsjubiläumsmeldungen erweitert.",
       "Statusänderungen werden mit altem und neuem Klartextwert in der Mitgliederchronik protokolliert.",
       "Fensterposition, normaler Fensterzustand und Maximierung werden gespeichert; der Splash startet auf dem zuletzt verwendeten Monitor.",
diff --git a/src/ccma/domain/dates.py b/src/ccma/domain/dates.py
index 97097cc..4592014 100644
--- a/src/ccma/domain/dates.py
+++ b/src/ccma/domain/dates.py
@@ -79,9 +79,13 @@ def normalize_date_input(value: str, field_name: str) -> str:
 
 
 def format_date_for_display(value: str) -> str:
-    if not value.strip():
+    text = value.strip()
+    if not text:
         return ""
-    parsed = parse_iso_date(value, "Datum")
+    try:
+        parsed = parse_iso_date(text, "Datum")
+    except DateValidationError:
+        return text
     return parsed.strftime(system_date_pattern()) if parsed else ""
 
 
diff --git a/src/ccma/services/housekeeper.py b/src/ccma/services/housekeeper.py
index 105719f..46126bd 100644
--- a/src/ccma/services/housekeeper.py
+++ b/src/ccma/services/housekeeper.py
@@ -4,7 +4,12 @@ import calendar
 from dataclasses import dataclass, field
 from datetime import date, timedelta
 
-from ccma.domain.dates import DateValidationError, parse_iso_date, validate_birth_date
+from ccma.domain.dates import (
+    DateValidationError,
+    parse_iso_date,
+    validate_birth_date,
+    validate_member_dates,
+)
 from ccma.domain.models import HousekeeperFinding
 from ccma.services.intervals import AnniversaryInterval, parse_anniversary_intervals
 from ccma.storage.repository import MemberRepository
@@ -48,6 +53,23 @@ class Housekeeper:
         current_date = today or date.today()
         findings: list[HousekeeperFinding] = []
         for member in self.repository.list_members():
+            try:
+                validate_member_dates(
+                    birth_date=member.birth_date,
+                    accepted_at=member.accepted_at,
+                    membership_started_at=member.membership_started_at,
+                    today=current_date,
+                )
+            except DateValidationError as exc:
+                findings.append(
+                    HousekeeperFinding(
+                        severity="error",
+                        member_id=member.member_id,
+                        code="invalid_member_dates",
+                        title=f"{member.display_name}: Ungültige Datumsangabe",
+                        detail=str(exc),
+                    )
+                )
             if member.status in {
                 "active",
                 "suspended_contribution",
diff --git a/tests/test_dates.py b/tests/test_dates.py
index fea9d34..f0ad752 100644
--- a/tests/test_dates.py
+++ b/tests/test_dates.py
@@ -36,6 +36,10 @@ def test_date_display_uses_system_pattern(monkeypatch) -> None:
     assert format_date_for_display("2024-02-29") == "2024-02-29"
 
 
+def test_invalid_date_remains_visible_for_correction() -> None:
+    assert format_date_for_display("31/12/2000") == "31/12/2000"
+
+
 def test_birth_date_checks_future_and_plausibility() -> None:
     today = date(2026, 6, 21)
     assert validate_birth_date("2000-06-22", today=today) == date(2000, 6, 22)
diff --git a/tests/test_housekeeper.py b/tests/test_housekeeper.py
index e6b548b..a5d300b 100644
--- a/tests/test_housekeeper.py
+++ b/tests/test_housekeeper.py
@@ -1,3 +1,4 @@
+import json
 from datetime import date
 
 from ccma.domain.models import ContributionData
@@ -91,3 +92,20 @@ def test_housekeeper_reports_day_month_and_year_anniversaries(tmp_path) -> None:
         "Anniversary2 Member hat heute 1-jähriges Mitgliedsjubiläum",
         "Anniversary3 Member hat in 1 Tag 10-jähriges Mitgliedsjubiläum",
     }
+
+
+def test_housekeeper_reports_invalid_member_dates(tmp_path) -> None:
+    repository = MemberRepository(tmp_path)
+    repository.initialize()
+    member = repository.create_member(first_name="Broken", last_name="Date")
+    member_path = repository.members_root / member.member_id / "member.json"
+    raw = json.loads(member_path.read_text(encoding="utf-8"))
+    raw["person"]["birth_date"] = "31/12/2000"
+    member_path.write_text(json.dumps(raw), encoding="utf-8")
+
+    findings = Housekeeper(repository).run(today=date(2026, 6, 21))
+    invalid = [finding for finding in findings if finding.code == "invalid_member_dates"]
+
+    assert len(invalid) == 1
+    assert invalid[0].member_id == member.member_id
+    assert "Geburtsdatum" in invalid[0].detail