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 1180565228,I_kwDOAMm_X85GXf7s,6412,numpy datetime conversion with DataArray is not working,43635101,open,0,,,3,2022-03-25T09:46:12Z,2022-03-29T14:22:11Z,,NONE,,,,"### What happened? I have a simple DataArray with `datetime[ns]` inside, but when I try to convert this to a supported numpy datetime dtype, the results is still a `datetime[ns]`. Using the `values` attribute & converting it, returns the correct results ### What did you expect to happen? I excpected the DataArray to be converted in the correct dtype ### Minimal Complete Verifiable Example ```Python >>> time = pd.date_range('2015-01-01 00:00:00', '2015-12-31 23:59:00', inclusive='left', freq='15min') >>> da = xr.DataArray(time) >>> da array(['2015-01-01T00:00:00.000000000', '2015-01-01T00:15:00.000000000', '2015-01-01T00:30:00.000000000', ..., '2015-12-31T23:15:00.000000000', '2015-12-31T23:30:00.000000000', '2015-12-31T23:45:00.000000000'], dtype='datetime64[ns]') Coordinates: * dim_0 (dim_0) datetime64[ns] 2015-01-01 ... 2015-12-31T23:45:00 >>> da.astype(""datetime64[Y]"") array(['2015-01-01T00:00:00.000000000', '2015-01-01T00:00:00.000000000', '2015-01-01T00:00:00.000000000', ..., '2015-01-01T00:00:00.000000000', '2015-01-01T00:00:00.000000000', '2015-01-01T00:00:00.000000000'], dtype='datetime64[ns]') Coordinates: * dim_0 (dim_0) datetime64[ns] 2015-01-01 ... 2015-12-31T23:45:00 >>> da.values.astype(""datetime64[Y]"") array(['2015', '2015', '2015', ..., '2015', '2015', '2015'], dtype='datetime64[Y]') ``` ### Relevant log output _No response_ ### Anything else we need to know? _No response_ ### Environment INSTALLED VERSIONS ------------------ commit: None python: 3.8.10 (default, Nov 26 2021, 20:14:08) [GCC 9.3.0] python-bits: 64 OS: Linux OS-release: 5.13.0-37-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: ('en_US', 'UTF-8') libhdf5: 1.12.1 libnetcdf: None xarray: 0.20.2 pandas: 1.4.1 numpy: 1.22.3 scipy: 1.8.0 netCDF4: None pydap: None h5netcdf: None h5py: 3.6.0 Nio: None zarr: None cftime: None nc_time_axis: None PseudoNetCDF: None rasterio: None cfgrib: None iris: None bottleneck: None dask: 2022.03.0 distributed: 2022.3.0 matplotlib: 3.5.1 cartopy: None seaborn: None numbagg: None fsspec: 2022.02.0 cupy: None pint: 0.18 sparse: None setuptools: 60.6.0 pip: 22.0.3 conda: None pytest: 6.2.5 IPython: 8.1.1 sphinx: None","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/6412/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,issue