NaT - Series[timedelta64] returns NaT · Issue #19158 · pandas-dev/pandas (original) (raw)

Surfaced in #19139, not present in 0.22.0:

tdi = pd.TimedeltaIndex(['1 day', '2 day'], name='x')
ser = pd.Series(tdi)

>>> pd.NaT - ser
NaT

Expected:

>>> pd.NaT - ser
0   NaT
1   NaT
Name: x, dtype: timedelta64[ns]