resample up skips first day · Issue #3020 · pandas-dev/pandas (original) (raw)

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Description

When resampling from a TimeSeries with freq='MS' to freq='D' the TimeSeries is shifted forward by one day, skipping the first element:

In [64]: dates = pd.date_range('01-Apr-13','01-May-13',freq='MS')

In [65]: ts = pd.TimeSeries([1,2],dates)

In [66]: ts Out[66]: 2013-04-01 1 2013-05-01 2 Freq: MS

In [67]: ts.resample('d',closed='left',label='left') Out[67]: 2013-04-02 NaN 2013-04-03 NaN 2013-04-04 NaN 2013-04-05 NaN 2013-04-06 NaN 2013-04-07 NaN 2013-04-08 NaN 2013-04-09 NaN 2013-04-10 NaN 2013-04-11 NaN 2013-04-12 NaN 2013-04-13 NaN 2013-04-14 NaN 2013-04-15 NaN 2013-04-16 NaN 2013-04-17 NaN 2013-04-18 NaN 2013-04-19 NaN 2013-04-20 NaN 2013-04-21 NaN 2013-04-22 NaN 2013-04-23 NaN 2013-04-24 NaN 2013-04-25 NaN 2013-04-26 NaN 2013-04-27 NaN 2013-04-28 NaN 2013-04-29 NaN 2013-04-30 NaN 2013-05-01 2 2013-05-02 NaN Freq: D