Fix comparison from wrong formats with datetime objects (#2697)

Co-authored-by: Adam Hopkins <adam@amhopkins.com>

tests/test_response_file.py

@@ -0,0 +1,55 @@
+from datetime import datetime, timezone
+from logging import INFO
+
+import pytest
+
+from sanic.compat import Header
+from sanic.response.convenience import validate_file
+
+
+@pytest.mark.parametrize(
+    "ifmod,lastmod,expected",
+    (
+        ("Sat, 01 Apr 2023 00:00:00 GMT", 1672524000, None),
+        (
+            "Sat, 01 Apr 2023 00:00:00",
+            1672524000,
+            "converting if_modified_since",
+        ),
+        (
+            "Sat, 01 Apr 2023 00:00:00 GMT",
+            datetime(2023, 1, 1, 0, 0, 0),
+            "converting last_modified",
+        ),
+        (
+            "Sat, 01 Apr 2023 00:00:00",
+            datetime(2023, 1, 1, 0, 0, 0),
+            None,
+        ),
+        (
+            "Sat, 01 Apr 2023 00:00:00 GMT",
+            datetime(2023, 1, 1, 0, 0, 0).replace(tzinfo=timezone.utc),
+            None,
+        ),
+        (
+            "Sat, 01 Apr 2023 00:00:00",
+            datetime(2023, 1, 1, 0, 0, 0).replace(tzinfo=timezone.utc),
+            "converting if_modified_since",
+        ),
+    ),
+)
+@pytest.mark.asyncio
+async def test_file_timestamp_validation(
+    lastmod, ifmod, expected, caplog: pytest.LogCaptureFixture
+):
+    headers = Header([["If-Modified-Since", ifmod]])
+
+    with caplog.at_level(INFO):
+        response = await validate_file(headers, lastmod)
+    assert response.status == 304
+    records = caplog.records
+    if not expected:
+        assert len(records) == 0
+    else:
+        record = records[0]
+        assert expected in record.message