BUG-23282 Move check to _wrap_result and add bug number to tests

Author: JustinZhengBC

pandas/core/nanops.py

@@ -269,6 +269,9 @@ def _view_if_needed(values):
 def _wrap_results(result, dtype):
     """ wrap our results if needed """
 
+    if (is_integer(result) and is_datetime_or_timedelta_dtype(dtype)
+        and result == _int64_max):
+        result = tslibs.iNaT
     if is_datetime64_dtype(dtype):
         if not isinstance(result, np.ndarray):
             result = tslibs.Timestamp(result)
@@ -718,9 +721,6 @@ def reduction(values, axis=None, skipna=True, mask=None):
                 result = np.nan
         else:
             result = getattr(values, meth)(axis)
-            if (is_integer(result) and is_datetime_or_timedelta_dtype(dtype)
-                    and result == _int64_max):
-                result = tslibs.iNaT
 
         result = _wrap_results(result, dtype)
         return _maybe_null_out(result, axis, mask)

pandas/tests/series/test_datetime_values.py

@@ -515,10 +515,12 @@ def test_dt_timetz_accessor(self, tz_naive_fixture):
         pd.Series([pd.NaT, pd.Timedelta('nat')]),
         pd.Series([pd.Timedelta('nat'), pd.Timedelta('nat')])])
     def test_minmax_nat_series(self, nat):
+        # GH 23282
         assert nat.min() is pd.NaT
         assert nat.max() is pd.NaT
 
     @pytest.mark.parametrize('nat', [
+        # GH 23282
         pd.DataFrame([pd.NaT, pd.NaT]),
         pd.DataFrame([pd.NaT, pd.Timedelta('nat')]),
         pd.DataFrame([pd.Timedelta('nat'), pd.Timedelta('nat')])])