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/3739#issuecomment-580860461,https://api.github.com/repos/pydata/xarray/issues/3739,580860461,MDEyOklzc3VlQ29tbWVudDU4MDg2MDQ2MQ==,1197350,2020-01-31T18:46:19Z,2020-01-31T18:46:19Z,MEMBER,"Hi @avatar101 - thanks for your issue!

I couldn't fully reproduce your example, since it references files that I don't have access to. For the future, please consider trying to create a ""Minimal, Complete and Verifiable Example"" (MCVE): (http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports)

In the meantime, I do have a suggestion you could try. Instead of
```python
ds_test.time.attrs['units'] = ""Seconds since 1970-01-01 00:00:00""
```
try
```python
ds_test.time.encoding['units'] = ""Seconds since 1970-01-01 00:00:00""
```

The reason is that, since you have created your time coordinate using `pd.date_range`, which returns a `datetime64` dtype, that variable is already considered to be encoded.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,558293655