From 9d1c18d70769f982ed0a654dcc09154a4f62b8b8 Mon Sep 17 00:00:00 2001
From: Branch Vincent <branchevincent@gmail.com>
Date: Tue, 10 Jun 2025 22:54:14 -0700
Subject: [PATCH] fix: support a SOURCE_DATE_EPOCH prior to 1980

---
 src/pdm/backend/wheel.py |  5 ++---
 tests/test_api.py        | 28 ++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/src/pdm/backend/wheel.py b/src/pdm/backend/wheel.py
index 6cd743c..7828ffd 100644
--- a/src/pdm/backend/wheel.py
+++ b/src/pdm/backend/wheel.py
@@ -48,9 +48,8 @@
 except (ValueError, KeyError):
     ZIPINFO_DATE_TIME = (2016, 1, 1, 0, 0, 0)
 else:
-    if _env_date[0] < 1980:
-        raise ValueError("zipinfo date can't be earlier than 1980")
-    ZIPINFO_DATE_TIME = _env_date
+    # `zipfile.ZipInfo` does not support timestamps before 1980
+    ZIPINFO_DATE_TIME = max(_env_date, (1980, 1, 1, 0, 0, 0))
 
 
 def _open_for_write(path: str | Path) -> IO[str]:
diff --git a/tests/test_api.py b/tests/test_api.py
index 91d5a90..6198a29 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -1,4 +1,7 @@
+from __future__ import annotations
+
 import email
+import importlib
 import os
 import sys
 import tarfile
@@ -404,6 +407,31 @@ def test_build_wheel_preserve_permission(dist: Path) -> None:
         assert filemode & 0o111
 
 
+@pytest.mark.parametrize("name", ["demo-package"])
+@pytest.mark.parametrize(
+    ("epoch", "expected_date_time"),
+    [
+        ("0", (1980, 1, 1, 0, 0, 0)),
+        ("nan", (2016, 1, 1, 0, 0, 0)),
+        ("1580601700", (2020, 2, 2, 0, 1, 40)),
+    ],
+)
+def test_build_wheel_respects_source_date_epoch(
+    monkeypatch: pytest.MonkeyPatch,
+    dist: Path,
+    epoch: str,
+    expected_date_time: tuple[int, ...],
+) -> None:
+    monkeypatch.setenv("SOURCE_DATE_EPOCH", epoch)
+    from pdm.backend import wheel
+
+    importlib.reload(wheel)
+    wheel_name = api.build_wheel(dist.as_posix())
+    with zipfile.ZipFile(dist / wheel_name) as zf:
+        zip_info = zf.getinfo("demo_package-0.1.0.dist-info/WHEEL")
+        assert zip_info.date_time == expected_date_time
+
+
 @pytest.mark.usefixtures("scm")
 @pytest.mark.parametrize("name", ["demo-using-scm"])
 def test_build_wheel_write_version_to_file(fixture_project: Path, dist) -> None: