issue_comments: 429540715

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https://github.com/pydata/xarray/issues/2484#issuecomment-429540715 https://api.github.com/repos/pydata/xarray/issues/2484 429540715 MDEyOklzc3VlQ29tbWVudDQyOTU0MDcxNQ== 6628425 2018-10-13T13:10:33Z 2018-10-13T13:20:35Z MEMBER

Adding a TimedeltaIndex to a CFTimeIndex would also make sense: ``` In [1]: import xarray as xr; import pandas as pd

In [2]: a = xr.cftime_range('2000', periods=5)

In [3]: deltas = pd.TimedeltaIndex([pd.Timedelta(days=1) for _ in range(5)])

In [4]: a + deltas Out[4]: CFTimeIndex([2000-01-02 00:00:00, 2000-01-03 00:00:00, 2000-01-04 00:00:00, 2000-01-05 00:00:00, 2000-01-06 00:00:00], dtype='object')

In [5]: deltas + a Out[5]: CFTimeIndex([2000-01-02 00:00:00, 2000-01-03 00:00:00, 2000-01-04 00:00:00, 2000-01-05 00:00:00, 2000-01-06 00:00:00], dtype='object') So would subtracting a TimedeltaIndex from a CFTimeIndex: In [6]: a - deltas Out[6]: CFTimeIndex([1999-12-31 00:00:00, 2000-01-01 00:00:00, 2000-01-02 00:00:00, 2000-01-03 00:00:00, 2000-01-04 00:00:00], dtype='object') ```

 
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