DatetimeIndex with closed='left' or 'right' drop dates at the boundaries · Issue #11804 · pandas-dev/pandas (original) (raw)

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Description

When either start or end is at the boundary of a date_range, they get dropped when they shouldn't if we specify the closed argument, see example below:

In [1]: pd.date_range('2015-09-12', '2015-10-30', freq='QS-MAR', closed='right')
Out[1]: DatetimeIndex([], dtype='datetime64[ns]', freq='QS-MAR')

In [2]: pd.date_range('2015-09-01', '2015-10-30', freq='QS-MAR', closed='left')
Out[2]: DatetimeInddex([], dtype='datetime64[ns]', freq='QS-MAR')