From 1ee4a68992c4687d20f857b057a797397f47d038 Mon Sep 17 00:00:00 2001
From: Punyapal Shah <53343069+MrPunyapal@users.noreply.github.com>
Date: Tue, 3 Nov 2026 04:07:39 +0530
Subject: [PATCH 1/2] perf: reuse changelog calendar formatter for each commit

---
 resources/js/lib/changelog.ts | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/resources/js/lib/changelog.ts b/resources/js/lib/changelog.ts
index 4aa6d9636..8f1330700 100644
--- a/resources/js/lib/changelog.ts
+++ b/resources/js/lib/changelog.ts
@@ -43,11 +43,10 @@ export function changelogDays(
     timeZone: string,
 ): ChangelogDay[] {
     const days: ChangelogDay[] = [];
+    const calendar = new Intl.DateTimeFormat('en-CA', { timeZone });
 
     for (const commit of commits) {
-        const date = new Date(commit.committed_at).toLocaleDateString('en-CA', {
-            timeZone,
-        });
+        const date = calendar.format(new Date(commit.committed_at));
         let day = days.at(-1);
 
         if (day?.date !== date) {

From f8ba1b60ae59803f96de26608e39957d86bb5f42 Mon Sep 17 00:00:00 2001
From: Punyapal Shah <53343069+MrPunyapal@users.noreply.github.com>
Date: Tue, 3 Nov 2026 14:02:45 +0530
Subject: [PATCH 2/2] fix: preserve invalid date fallback in changelog
 formatter

---
 resources/js/lib/changelog.ts | 5 ++++-
 tests/Unit/Changelog.test.ts  | 9 +++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/resources/js/lib/changelog.ts b/resources/js/lib/changelog.ts
index 8f1330700..3be6b60e7 100644
--- a/resources/js/lib/changelog.ts
+++ b/resources/js/lib/changelog.ts
@@ -46,7 +46,10 @@ export function changelogDays(
     const calendar = new Intl.DateTimeFormat('en-CA', { timeZone });
 
     for (const commit of commits) {
-        const date = calendar.format(new Date(commit.committed_at));
+        const parsed = new Date(commit.committed_at);
+        const date = Number.isNaN(parsed.getTime())
+            ? 'Invalid Date'
+            : calendar.format(parsed);
         let day = days.at(-1);
 
         if (day?.date !== date) {
diff --git a/tests/Unit/Changelog.test.ts b/tests/Unit/Changelog.test.ts
index 23d33f856..448f4b2b1 100644
--- a/tests/Unit/Changelog.test.ts
+++ b/tests/Unit/Changelog.test.ts
@@ -94,3 +94,12 @@ void test('names the day relative to today in the reader’s time zone', () => {
     assert.deepEqual(changelogDayHeading('2026-10-14', 'Europe/Budapest', now), { title: 'Wednesday', date: 'Oct 14' });
     assert.deepEqual(changelogDayHeading('2025-12-31', 'Europe/Budapest', now), { title: 'Wednesday', date: 'Dec 31, 2025' });
 });
+
+void test('keeps grouping when a commit has an invalid timestamp', () => {
+    const days = changelogDays(
+        [commit(1, 'not-a-date', 'alice'), commit(2, '2026-10-18T03:30:00Z', 'bob')],
+        'Europe/Budapest',
+    );
+
+    assert.deepEqual(days.map((day) => day.date), ['Invalid Date', '2026-10-18']);
+});