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/2436#issuecomment-661721510,https://api.github.com/repos/pydata/xarray/issues/2436,661721510,MDEyOklzc3VlQ29tbWVudDY2MTcyMTUxMA==,20254164,2020-07-21T08:43:04Z,2020-07-21T08:43:04Z,CONTRIBUTOR,"### Description
Any news about this issue? I am facing the same problem and I had to get the calendars by hand... I tried to update xarray but there is still the same issue of missing the `ds.time.encoding` with `open_mfdataset` when the dimension to concatenate is the time (because the example from @keewis above works but the concatenation is on `x`).

### Step to reproduce
Here is a simple example to illustrate:

```python
import xarray as xr
ds = xr.tutorial.open_dataset('air_temperature')
ds.time.encoding
```

that gives:
```python
{'source': '/home/lalandmi/.xarray_tutorial_data/air_temperature.nc',
 'original_shape': (2920,),
 'dtype': dtype('float32'),
 'units': 'hours since 1800-01-01',
 'calendar': 'standard'}
```

Let's slipt this dataset and try to read it back with `open_mfdataset`:
```python
ds.sel(time='2013').to_netcdf('tutorial_air_temperature_2013.nc')
ds.sel(time='2014').to_netcdf('tutorial_air_temperature_2014.nc')
ds_mf = xr.open_mfdataset('tutorial_air_temperature_*.nc', combine='by_coords')
ds_mf.time.encoding
```
that results in an empty dictionary:
```python
{}
```

Adding some arguments `attrs_file=paths[0]` with the name of the files didn't change anything for me. Is there any other way or update about this?

### Xarray version
<details>
<summary>xr.show_versions()</summary>

```python
INSTALLED VERSIONS
------------------
commit: None
python: 3.8.4 | packaged by conda-forge | (default, Jul 17 2020, 15:16:46) 
[GCC 7.5.0]
python-bits: 64
OS: Linux
OS-release: 4.19.0-9-amd64
machine: x86_64
processor: 
byteorder: little
LC_ALL: None
LANG: fr_FR.UTF-8
LOCALE: fr_FR.UTF-8
libhdf5: 1.10.6
libnetcdf: 4.7.4

xarray: 0.16.0
pandas: 1.0.5
numpy: 1.19.0
scipy: None
netCDF4: 1.5.3
pydap: None
h5netcdf: None
h5py: None
Nio: None
zarr: None
cftime: 1.2.1
nc_time_axis: None
PseudoNetCDF: None
rasterio: None
cfgrib: None
iris: None
bottleneck: None
dask: 2.21.0
distributed: 2.21.0
matplotlib: None
cartopy: None
seaborn: None
numbagg: None
pint: None
setuptools: 49.2.0.post20200712
pip: 20.1.1
conda: None
pytest: None
IPython: 7.16.1
sphinx: None
```
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