issue_comments: 544299242

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html_url issue_url id node_id user created_at updated_at author_association body reactions performed_via_github_app issue
https://github.com/pydata/xarray/issues/3409#issuecomment-544299242 https://api.github.com/repos/pydata/xarray/issues/3409 544299242 MDEyOklzc3VlQ29tbWVudDU0NDI5OTI0Mg== 6213168 2019-10-20T22:25:00Z 2019-10-20T22:32:34Z MEMBER

Narrowed down: ```python

import numpy as np a = np.array(['1999-12-15', 'NaT'], dtype='M8[ns]') np.min(a) ` Output: numpy 1.17:numpy.datetime64('1999-12-15T00:00:00.000000000')numpy 1.18:numpy.datetime64('NaT')``

triggered by: https://github.com/pydata/xarray/blob/0f7ab0e909d9b6272f734a0b6fa4318e9522d3a2/xarray/core/duck_array_ops.py#L372

 
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