issue_comments: 625481974

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https://github.com/pydata/xarray/issues/4045#issuecomment-625481974 https://api.github.com/repos/pydata/xarray/issues/4045 625481974 MDEyOklzc3VlQ29tbWVudDYyNTQ4MTk3NA== 868027 2020-05-07T20:32:22Z 2020-05-07T20:32:22Z CONTRIBUTOR

This has something to do with the time values at some point being a float:

```python

import numpy as np np.datetime64("2017-02-22T16:24:10.586000000").astype("float64").astype(np.dtype('<M8[ns]')) numpy.datetime64('2017-02-22T16:24:10.585999872') ```

It looks like this is happening somewhere in the cftime library.

 
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