issues: 312449001

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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
312449001 MDU6SXNzdWUzMTI0NDkwMDE= 2043 How to completely prevent time coordinates from being decoded? 5700886 closed 0     1 2018-04-09T09:01:35Z 2018-04-09T10:55:58Z 2018-04-09T10:55:58Z CONTRIBUTOR      

Minimal example

The following shows that creating a time-coordinate with two dates before and after the latest date compatible to np.datetime64[ns] results in coordinates that have been decoded to np.datetime64[ns] for the first (and compatible) date and left at datetime.datetime for the second (and incompatible) date:

```python In [1]: from datetime import datetime ...: import numpy as np ...: import xarray as xr

In [2]: dates = [datetime(year, 1, 1) for year in [2262, 2263]] ...: ds = xr.Dataset(coords={"dates": dates})

In [3]: print(ds.coords["dates"][0]) <xarray.DataArray 'dates' ()> array('2262-01-01T00:00:00.000000000', dtype='datetime64[ns]') Coordinates: dates datetime64[ns] 2262-01-01

In [4]: print(ds.coords["dates"][1]) <xarray.DataArray 'dates' ()> array(datetime.datetime(2263, 1, 1, 0, 0), dtype=object) Coordinates: dates object 2263-01-01

In [5]: ds2 = xr.Dataset({})

In [6]: ds2["dates"] = (["dates", ], dates)

In [7]: ds2.coords["dates"][0] Out[7]: <xarray.DataArray 'dates' ()> array('2262-01-01T00:00:00.000000000', dtype='datetime64[ns]') Coordinates: dates datetime64[ns] 2262-01-01

In [8]: ds2.coords["dates"][1] Out[8]: <xarray.DataArray 'dates' ()> array(datetime.datetime(2263, 1, 1, 0, 0), dtype=object) Coordinates: dates object 2263-01-01

```

Problem description

I don't seem to find a way of passing time-coordinates to an xarray Dataset without having them decoded. This is problematic, because it makes it very hard (or impossible?) for a user to make sure a time axis does completely consist of, e.g., netcdftime objects.

Output of xr.show_versions() ```python In [5]: xr.show_versions() /home/wrath/miniconda3_20171008/envs/py3_std_course/lib/python3.6/site-packages/h5py/__init__.py:36: FutureWarning: Conversion of the second argument of issubdtype from `float` to `np.floating` is deprecated. In future, it will be treated as `np.float64 == np.dtype(float).type`. from ._conv import register_converters as _register_converters INSTALLED VERSIONS ------------------ commit: None python: 3.6.4.final.0 python-bits: 64 OS: Linux OS-release: 4.13.0-38-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: en_US.UTF-8 xarray: 0.10.2 pandas: 0.22.0 numpy: 1.14.2 scipy: 1.0.1 netCDF4: 1.3.1 h5netcdf: 0.5.0 h5py: 2.7.1 Nio: None zarr: 2.2.0 bottleneck: 1.2.1 cyordereddict: None dask: 0.17.2 distributed: 1.21.4 matplotlib: 2.2.2 cartopy: 0.16.0 seaborn: 0.8.1 setuptools: 39.0.1 pip: 9.0.1 conda: None pytest: None IPython: 6.3.1 sphinx: None ``` 
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   completed 13221727 issue

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