GH-74866: Fix utils.parsedate_to_datetime raising exception on None

Lib/email/utils.py

@@ -195,6 +195,8 @@ def make_msgid(idstring=None, domain=None):
 
 
 def parsedate_to_datetime(data):
+    if data is None:
+        return None
     parsed_date_tz = _parsedate_tz(data)
     if parsed_date_tz is None:
         raise ValueError('Invalid date value or format "%s"' % str(data))

Lib/test/test_email/test_utils.py

@@ -59,6 +59,9 @@ def test_parsedate_to_datetime_with_invalid_raises_valueerror(self):
             with self.subTest(dtstr=dtstr):
                 self.assertRaises(ValueError, utils.parsedate_to_datetime, dtstr)
 
+    def test_parsedate_to_datetime_with_None_returns_None(self):
+        self.assertIsNone(utils.parsedate_to_datetime(None))
+
 class LocaltimeTests(unittest.TestCase):
 
     def test_localtime_is_tz_aware_daylight_true(self):

Misc/NEWS.d/next/Library/2022-06-17-14-23-16.gh-issue-74866.WS__3i.rst

@@ -0,0 +1 @@
+Fix :meth:`utils.parsedate_to_datetime` raising exception on ``None``. It now returns ``None`` instead.