post.html line timestamps mirror scroll's relative_ts buckets: swap date:'g:i A' for the existing lyric_extras.relative_ts filter so same-day Lines render as 11:46 p.m., then collapse to weekday (Sat) past 24h, 07 Mar past a week, 07 Mar 2025 past a year — DRYs onto the single filter scroll already uses (no duplicated bucketing logic); same-day rendering shifts from 11:46 PM to 11:46 p.m. as a side effect of reusing the lowercase g:i a format relative_ts already standardised on — TDD

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/apps/billboard/tests/integrated/test_views.py

@@ -433,3 +433,51 @@ class SaveScrollPositionTest(TestCase):
             {"position": 100},
         )
         self.assertEqual(response.status_code, 302)
+
+
+class PostLineRelativeTimestampTest(TestCase):
+    """post.html mirrors scroll.html's bucketed `relative_ts` time rendering:
+    same-day Lines show a time; older ones collapse to weekday / month-day /
+    month-day-year. Bypasses `auto_now_add` with a queryset .update() so the
+    test can backdate Lines."""
+
+    def setUp(self):
+        self.owner = User.objects.create(email="owner@post-ts.io", username="owner")
+        self.client.force_login(self.owner)
+        from apps.billboard.models import Line, Post
+        self.Line = Line
+        self.post = Post.objects.create(owner=self.owner, title="Stamp")
+
+    def _backdate(self, line, **delta):
+        from apps.billboard.models import Line
+        Line.objects.filter(pk=line.pk).update(
+            created_at=timezone.now() - timezone.timedelta(**delta)
+        )
+
+    def test_recent_line_renders_clock_time(self):
+        self.Line.objects.create(post=self.post, text="now", author=self.owner)
+        response = self.client.get(reverse("billboard:view_post", args=[self.post.id]))
+        self.assertRegex(
+            response.content.decode(),
+            r'class="post-line-time"[^>]*>\s*\d+:\d{2}\s*[ap]\.m\.\s*<',
+        )
+
+    def test_two_day_old_line_renders_weekday(self):
+        line = self.Line.objects.create(post=self.post, text="old", author=self.owner)
+        self._backdate(line, days=2)
+        response = self.client.get(reverse("billboard:view_post", args=[self.post.id]))
+        import re
+        m = re.search(
+            r'class="post-line-time"[^>]*>\s*(\w+)\s*<', response.content.decode()
+        )
+        self.assertIsNotNone(m, "no .post-line-time cell rendered")
+        self.assertIn(m.group(1), {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"})
+
+    def test_thirty_day_old_line_renders_day_month(self):
+        line = self.Line.objects.create(post=self.post, text="oldr", author=self.owner)
+        self._backdate(line, days=30)
+        response = self.client.get(reverse("billboard:view_post", args=[self.post.id]))
+        self.assertRegex(
+            response.content.decode(),
+            r'class="post-line-time"[^>]*>\s*\d{2}\s\w{3}\s*<',
+        )