missed formatting and whatsnew

Author: mcgeestocks

doc/source/whatsnew/v2.1.0.rst

@@ -364,9 +364,11 @@ Datetimelike
 - Bug in :func:`date_range` when ``freq`` was a :class:`DateOffset` with ``nanoseconds`` (:issue:`46877`)
 - Bug in :meth:`Timestamp.date`, :meth:`Timestamp.isocalendar`, :meth:`Timestamp.timetuple`, and :meth:`Timestamp.toordinal` were returning incorrect results for inputs outside those supported by the Python standard library's datetime module (:issue:`53668`)
 - Bug in :meth:`Timestamp.round` with values close to the implementation bounds returning incorrect results instead of raising ``OutOfBoundsDatetime`` (:issue:`51494`)
+- Bug in :meth:`Timestamp.weekday` with days incorrectly calculating before year 1752 (:issue:`53738`)
 - Bug in :meth:`arrays.DatetimeArray.map` and :meth:`DatetimeIndex.map`, where the supplied callable operated array-wise instead of element-wise (:issue:`51977`)
 - Bug in constructing a :class:`Series` or :class:`DataFrame` from a datetime or timedelta scalar always inferring nanosecond resolution instead of inferring from the input (:issue:`52212`)
 - Bug in parsing datetime strings with weekday but no day e.g. "2023 Sept Thu" incorrectly raising ``AttributeError`` instead of ``ValueError`` (:issue:`52659`)
+-
 
 Timedelta
 ^^^^^^^^^

pandas/tests/scalar/timestamp/test_timestamp.py

@@ -223,13 +223,16 @@ def test_resolution(self):
         assert dt.as_unit("ms").resolution == Timedelta(milliseconds=1)
         assert dt.as_unit("s").resolution == Timedelta(seconds=1)
 
-    @pytest.mark.parametrize("date_string,expected", [("0000-2-29", 1), ("0000-3-1", 2), ("1582-10-14", 3), ("1582-10-15", 4)])
+    @pytest.mark.parametrize(
+        "date_string,expected",
+        [("0000-2-29", 1), ("0000-3-1", 2), ("1582-10-14", 3), ("1582-10-15", 4)],
+    )
     def test_dow_historic(self, date_string, expected):
         # GH 53738
         dt = Timestamp(date_string)
-        dow = dt.weekday()        
+        dow = dt.weekday()
         assert dow == expected
-        
+
 
 class TestTimestamp:
     def test_default_to_stdlib_utc(self):