issue_comments: 822968365

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https://github.com/pydata/xarray/issues/5106#issuecomment-822968365 https://api.github.com/repos/pydata/xarray/issues/5106 822968365 MDEyOklzc3VlQ29tbWVudDgyMjk2ODM2NQ== 40218891 2021-04-20T04:41:07Z 2021-04-20T04:41:07Z NONE

I am closing this issue. It is impossible to guess the proper time unit when dealing with missing data. Setting the attribute explicitly is a better solution.

A minor quibble: the statement ds1.reftime.encoding['units'] = 'hours since Big Bang' rises an exception AttributeError: 'NoneType' object has no attribute 'groups' It should be ValueError: invalid time units: hours since Big Bang the same as in the case 'hours after 1970-01-01'

 
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