id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
279595497,MDExOlB1bGxSZXF1ZXN0MTU2NjIwNjM4,1762,ENH: Add dt.date accessor.,2448579,closed,0,,,5,2017-12-06T01:43:51Z,2018-05-10T05:12:15Z,2018-01-14T00:28:11Z,MEMBER,,0,pydata/xarray/pulls/1762,"This PR lets us access `dt.date` thereby removing all higher frequency time information. 

*Use case:* Just like `dayofyear` but easier to interpret when only looking at 1 year of data. 

*Example:* Start with `da.time`
```
<xarray.DataArray 'time' (time: 8737)>
  array(['2014-01-01T00:00:00.000000000', '2014-01-01T01:00:00.000000000',
         '2014-01-01T02:00:00.000000000', ..., '2014-12-30T22:00:00.000000000',
         '2014-12-30T23:00:00.000000000', '2014-12-31T00:00:00.000000000'], dtype='datetime64[ns]')
  Coordinates:
    * time     (time) datetime64[ns] 2014-01-01 2014-01-01T01:00:00 ...
```

then `da.time.dt.date` yields
```
<xarray.DataArray 'date' (time: 8737)>
  array(['2014-01-01T00:00:00.000000000', '2014-01-01T00:00:00.000000000',
         '2014-01-01T00:00:00.000000000', ..., '2014-12-30T00:00:00.000000000',
         '2014-12-30T00:00:00.000000000', '2014-12-31T00:00:00.000000000'], dtype='datetime64[ns]')
  Coordinates:
    * time     (time) datetime64[ns] 2014-01-01 2014-01-01T01:00:00 ...
```

 - [x] Tests added (for all bug fixes or enhancements)
 - [x] Tests passed (for all non-documentation changes)
 - [x] Passes ``git diff upstream/master **/*py | flake8 --diff`` (remove if you did not edit any Python files)
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API (remove if this change should not be visible to users, e.g., if it is an internal clean-up, or if this is part of a larger project that will be documented later)","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/1762/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull