Type ctype variables and functions, whatsnew fix

Author: mroeschke

doc/source/whatsnew/v0.21.0.txt

@@ -399,7 +399,7 @@ Conversion
 - Fixed the return type of ``IntervalIndex.is_non_overlapping_monotonic`` to be a Python ``bool`` for consistency with similar attributes/methods.  Previously returned a ``numpy.bool_``. (:issue:`17237`)
 - Bug in ``IntervalIndex.is_non_overlapping_monotonic`` when intervals are closed on both sides and overlap at a point (:issue:`16560`)
 - Bug in :func:`Series.fillna` returns frame when ``inplace=True`` and ``value`` is dict (:issue:`16156`)
-- Bug in ``Timestamp.weekday_name`` returning a UTC-based weekday name when localized to a timezone (:issue:`17354`)
+- Bug in :attr:`Timestamp.weekday_name` returning a UTC-based weekday name when localized to a timezone (:issue:`17354`)
 
 Indexing
 ^^^^^^^^

pandas/_libs/tslib.pyx

@@ -1266,19 +1266,23 @@ cdef class _Timestamp(datetime):
         # same timezone if specified)
         return datetime.__sub__(self, other)
 
-    cpdef _maybe_convert_value_to_local(self):
+    cdef int64_t _maybe_convert_value_to_local(self):
         """Convert UTC i8 value to local i8 value if tz exists"
         val = self.value
         if self.tz is not None and not _is_utc(self.tz):
             val = tz_convert_single(self.value, 'UTC', self.tz)
         return val
 
     cpdef _get_field(self, field):
+        cdef:
+            int64_t val
         val = self._maybe_convert_value_to_local()
         out = get_date_field(np.array([val], dtype=np.int64), field)
         return int(out[0])
 
     cpdef _get_named_field(self, field):
+        cdef:
+            int64_t val
         val = self._maybe_convert_value_to_local()
         out = get_date_name_field(np.array([val], dtype=np.int64), field)
         return out[0]