Updating and re-opening PR #48275

doc/source/whatsnew/v2.0.0.rst

@@ -819,6 +819,7 @@ Datetimelike
 - Bug in :func:`to_datetime` was throwing ``ValueError`` when parsing dates with ISO8601 format where some values were not zero-padded (:issue:`21422`)
 - Bug in :func:`to_datetime` was giving incorrect results when using ``format='%Y%m%d'`` and ``errors='ignore'`` (:issue:`26493`)
 - Bug in :func:`to_datetime` was failing to parse date strings ``'today'`` and ``'now'`` if ``format`` was not ISO8601 (:issue:`50359`)
+- Bug in :class:`RelativeDeltaOffset` which caused inconsistent behavior upon multiplying a :class:`DateOffset` (:issue:`47953`)
 -
 
 Timedelta

pandas/_libs/tslibs/offsets.pyx

@@ -1229,12 +1229,7 @@ cdef class RelativeDeltaOffset(BaseOffset):
  else:
  td_nano = Timedelta(0)
 
- if self.n > 0:
- for i in range(self.n):
- other = other + self._offset + td_nano
- else:
- for i in range(-self.n):
- other = other - self._offset - td_nano
+ other = other + ((self._offset + td_nano) * self.n)
 
  if tzinfo is not None and self._use_relativedelta:
  # bring tz back from UTC calculation

pandas/tests/tseries/offsets/test_offsets.py

@@ -33,6 +33,7 @@
 from pandas.errors import PerformanceWarning
 
 from pandas import (
+ DataFrame,
  DatetimeIndex,
  Series,
  date_range,
@@ -1061,6 +1062,38 @@ def test_construct_int_arg_no_kwargs_assumed_days(n):
  assert result == expected
 
 
+def test_offset_multiplication():
+ # GH#47953
+ mo1 = DateOffset(months=1)
+ mo2 = DateOffset(months=2)
+
+ startscalar = Timestamp("2020-01-30")
+ startarray = Series([Timestamp("2020-01-30")])
+
+ resultscalar1 = startscalar + (mo1 * 2)
+ resultscalar2 = startscalar + mo2
+ resultarray1 = startarray + (mo1 * 2)
+ resultarray2 = startarray + mo2
+
+ expectedscalar = Timestamp("2020-03-30")
+ expectedarray = Series([Timestamp("2020-03-30")])
+ assert resultscalar1 == expectedscalar
+ assert resultscalar2 == expectedscalar
+ tm.assert_series_equal(resultarray1, expectedarray)
+ tm.assert_series_equal(resultarray2, expectedarray)
+
+ df = DataFrame({"T": [Timestamp("2019-04-30")], "D": [DateOffset(months=1)]})
+ frameresult1 = df["T"] + 26 * df["D"]
+ df2 = DataFrame(
+ {
+ "T": [Timestamp("2019-04-30"), Timestamp("2019-04-30")],
+ "D": [DateOffset(months=1), DateOffset(months=1)],
+ }
+ )
+ frameresult2 = df2["T"] + 26 * df2["D"]
+ assert frameresult1[0] == frameresult2[0]
+
+
 @pytest.mark.parametrize(
  "offset, expected",
  [