From fb9de61e86b6e3bc67300f3f644a70fa74b323d6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Minh=20Nguy=E1=BB=85n?= <mxn@1ec5.org>
Date: Wed, 12 Jun 2024 15:19:15 -0700
Subject: [PATCH] Avoid propagating invalid date

---
 modules/util/date.js   | 3 +++
 test/spec/util/date.js | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/modules/util/date.js b/modules/util/date.js
index cc04862694..4115731553 100644
--- a/modules/util/date.js
+++ b/modules/util/date.js
@@ -70,6 +70,9 @@ export function utilNormalizeDateString(raw) {
         date.setUTCFullYear(parseInt((match[1] || '') + match[2], 10));
         if (match[3]) date.setUTCMonth(parseInt(match[3], 10) - 1); // 0-based
         if (match[4]) date.setUTCDate(parseInt(match[4], 10));
+        if (isNaN(date.getDate())) {
+            return null;
+        }
     } else {
         // Fall back on whatever the browser can parse into a date.
         date = new Date(raw);
diff --git a/test/spec/util/date.js b/test/spec/util/date.js
index 2e654de3ac..d2d9d8a2d2 100644
--- a/test/spec/util/date.js
+++ b/test/spec/util/date.js
@@ -55,6 +55,8 @@ describe('iD.date', function() {
         it('rejects malformed dates', function() {
             expect(iD.utilNormalizeDateString('1970-01--1')).to.eql(null);
             expect(iD.utilNormalizeDateString('197X')).to.eql(null); // no EDTF for now
+            // https://github.com/OpenHistoricalMap/issues/issues/826
+            expect(iD.utilNormalizeDateString('1912091095')).to.eql(null);
         });
         it('respects the original precision', function() {
             expect(iD.utilNormalizeDateString('123').value).to.eql('0123');