diff --git a/CHANGELOG.md b/CHANGELOG.md
index a98c0bf..3a236f1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## Unreleased
+
+### Fixed
+
+- **An impossible calendar date discarded a whole house.** `2025-02-30T00:00:00Z`
+  has the shape of an ISO timestamp and names a day that does not exist.
+  `strptime` raised a bare `ValueError`, `_record()` catches `UnreadableDate`
+  alone, so the error reached the house handler, wrote one `fetch_error`, and
+  abandoned every later bill in that house. It now raises `UnreadableDate`, the
+  bad field goes to null, and the bill keeps everything else. This is the defect
+  0.15.0 fixed for other date shapes and missed for this one.
+
+
 ## 0.15.0 — 2026-08-18
 
 **Two of these change published numbers. Re-run the bills probe, and read the
diff --git a/commoner_probe/bill_catalog_api.py b/commoner_probe/bill_catalog_api.py
index 581f632..29ff528 100644
--- a/commoner_probe/bill_catalog_api.py
+++ b/commoner_probe/bill_catalog_api.py
@@ -136,7 +136,16 @@ def _date(value: object, field: str = "date") -> str | None:
     # read differently on two machines walking the same source.
     stamped = _ISO_STAMP.match(text)
     if stamped and _in_range(stamped):
-        return datetime.strptime(stamped.group(1), "%Y-%m-%d").strftime("%Y-%m-%d")
+        try:
+            return datetime.strptime(stamped.group(1), "%Y-%m-%d").strftime("%Y-%m-%d")
+        except ValueError as exc:
+            # `2025-02-30` has the shape of a date and is not one. A bare
+            # ValueError here escaped `_record()`, which catches UnreadableDate
+            # alone, reached the house handler, and abandoned every later bill
+            # in that house over one field.
+            raise UnreadableDate(
+                f"{field}: {text!r} has the shape of an ISO timestamp and names a day "
+                f"that does not exist ({exc}).") from exc
     raise UnreadableDate(
         f"{field}: {text!r} matches no date format this endpoint is known to serve "
         f"({', '.join(_DATE_FORMATS)}, or ISO 8601). It is not being truncated into "
diff --git a/tests/test_bill_dates.py b/tests/test_bill_dates.py
index db21b6a..554edb7 100644
--- a/tests/test_bill_dates.py
+++ b/tests/test_bill_dates.py
@@ -374,3 +374,30 @@ def test_another_adapter_s_history_survives(self, tmp_path):
         tracked = [r["bill_status"] for r in rows if r.get("kind") == "prs_bill_track"]
         assert tracked == ["Pending", "Passed"], tracked
         assert [r["assent_date"] for r in rows if r.get("kind") == "bill_record"] == ["2025-12-20"]
+
+
+class TestAnImpossibleCalendarDateStaysOneField:
+    """A P1 from Codex that merged unfixed on #142. The dispatcher read one
+    comment of a two-comment review."""
+
+    def test_an_impossible_day_raises_unreadable_not_value_error(self):
+        with pytest.raises(UnreadableDate):
+            _date("2025-02-30T00:00:00Z", "assent_date")
+
+    def test_the_house_survives_an_impossible_day(self, tmp_path):
+        """`_record()` catches `UnreadableDate` alone, so a bare `ValueError`
+        reached the house handler, wrote one `fetch_error`, and abandoned every
+        later bill in that house."""
+        from commoner_probe.bill_catalog_api import BillsProbe
+
+        good = {"billNumber": "1", "billYear": "2025", "billName": "Good Bill",
+                "billIntroducedDate": "2025-01-02 00:00:00.0"}
+        bad = {"billNumber": "2", "billYear": "2025", "billName": "Bad Bill",
+               "billIntroducedDate": "2025-02-30T00:00:00Z"}
+        probe = BillsProbe(tmp_path / "out", sleep=0, houses=["ls"])
+        probe.bills_all = lambda house: iter([bad, good])
+
+        rows = probe.probe()
+        assert [r["fetch_status"] for r in rows] == ["parse_error", "ok"], rows
+        assert rows[0]["bill_name"] == "Bad Bill"
+        assert rows[0]["introduced_date"] is None