issue_comments: 256410357

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https://github.com/pydata/xarray/issues/1062#issuecomment-256410357 https://api.github.com/repos/pydata/xarray/issues/1062 256410357 MDEyOklzc3VlQ29tbWVudDI1NjQxMDM1Nw== 1217238 2016-10-26T16:52:39Z 2016-10-26T16:52:39Z MEMBER

Indeed, NumPy converts these units inconsistently with Udunits:

```

np.timedelta64(1, 'Y').astype('timedelta64[D]') numpy.timedelta64(365,'D') ```

We currently convert all datetime arrays to ns resolution (for pandas compatibility), which means this would give possibly broken results.

But honestly, we haven't looked into this very much. If this would be a uniform improvement over the current state then it's worth considering.

CC @jhamman 

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