issue_comments: 706749409

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https://github.com/pydata/xarray/issues/4495#issuecomment-706749409 https://api.github.com/repos/pydata/xarray/issues/4495 706749409 MDEyOklzc3VlQ29tbWVudDcwNjc0OTQwOQ== 10194086 2020-10-11T18:43:48Z 2020-10-11T18:43:48Z MEMBER

To reproduce:

```python import numpy as np import xarray as xr

time1 = xr.cftime_range("2000", "2000-12-31", calendar="standard") time2 = xr.cftime_range("2001", "2001-12-31", calendar="proleptic_gregorian")

da1 = xr.DataArray(np.random.randn(366), dims="time", coords=dict(time=time1)).to_dataset(name="name") da2 = xr.DataArray(np.random.randn(365), dims="time", coords=dict(time=time2)).to_dataset(name="name")

xr.combine_by_coords([da1, da2]) returnspython ... StopIteration: ```

Funny enough this does trigger the correct error: ```python time3 = xr.cftime_range("2000", "2000-12-31", calendar="proleptic_gregorian") da3 = xr.DataArray(np.random.randn(366), dims="time", coords=dict(time=time3)).to_dataset(name="name")

xr.combine_by_coords([da1, da3]) ```

python ... TypeError: cannot compare cftime.DatetimeProlepticGregorian(2000, 1, 1, 0, 0, 0, 0) and cftime.DatetimeGregorian(2000, 1, 1, 0, 0, 0, 0) (different calendars)

 
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