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
2145890271,PR_kwDOAMm_X85negFY,8774,"Fixing issue #8770: Improved frequency parameter logic to set it to 'D' only if periods, start, or end are None.",46948104,closed,0,,,11,2024-02-21T05:48:46Z,2024-02-24T12:43:22Z,2024-02-24T12:43:19Z,CONTRIBUTOR,,0,pydata/xarray/pulls/8774,"This Pull Request addresses the issue reported regarding the default setting of the frequency (freq) parameter in Xarray. Currently, the frequency is explicitly set to ""D"" by default, which may not always be appropriate behavior. The proposed improvement adjusts the logic to set the frequency to ""D"" only if any of the parameters (periods, start, or end) are None, providing more flexibility and aligning with expected behavior.

Changes:

Updated logic for setting the frequency parameter to consider periods, start, or end values.
Added checks to ensure that the frequency is set to ""D"" only when necessary.

Please review and provide feedback on the proposed changes. Any suggestions for further improvements are welcome.

<!-- Feel free to remove check-list items aren't relevant to your change -->

- [x] Closes #8770 
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2142410162,I_kwDOAMm_X85_spWy,8770,Error in xr.date_range with exactly three parameters provided.,46948104,closed,0,,,2,2024-02-19T13:45:00Z,2024-02-24T12:43:20Z,2024-02-24T12:43:20Z,CONTRIBUTOR,,,,"### What happened?

I was trying to create a list of a fixed number of N dates from start to end using the ""periods"" argument of  xr.date_range.

### What did you expect to happen?

To obtain a DatetimeIndex object with N period's dates between the starting date and the ending date.

### Minimal Complete Verifiable Example

```Python
import xarray as xr
from datetime import datetime

# Attempt to create a date range with exactly three parameters
xr.date_range(start=datetime(1961, 1, 1), end=datetime(1991, 1, 1), periods=3)
```


### MVCE confirmation

- [X] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
- [x] Complete example — the example is self-contained, including all data and the text of any traceback.
- [x] Verifiable example — the example copy & pastes into an IPython prompt or [Binder notebook](https://mybinder.org/v2/gh/pydata/xarray/main?urlpath=lab/tree/doc/examples/blank_template.ipynb), returning the result.
- [X] New issue — a search of GitHub Issues suggests this is not a duplicate.
- [x] Recent environment — the issue occurs with the latest version of xarray and its dependencies.

### Relevant log output

```Python
Traceback (most recent call last):
  File ""<stdin>"", line 1, in <module>
  File ""/home/roberto/miniconda3/envs/gs1/lib/python3.11/site-packages/xarray/coding/cftime_offsets.py"", line 1225, in date_range
    return pd.date_range(
           ^^^^^^^^^^^^^^
  File ""/home/roberto/miniconda3/envs/gs1/lib/python3.11/site-packages/pandas/core/indexes/datetimes.py"", line 1009, in date_range
    dtarr = DatetimeArray._generate_range(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ""/home/roberto/miniconda3/envs/gs1/lib/python3.11/site-packages/pandas/core/arrays/datetimes.py"", line 400, in _generate_range
    raise ValueError(
ValueError: Of the four parameters: start, end, periods, and freq, exactly three must be specified
```


### Anything else we need to know?

When running:

```
import pandas as pd
from datetime import datetime

pd.date_range(start=datetime(1961, 1, 1), end=datetime(1991, 1, 1), periods=2)
```

Outputs:
`DatetimeIndex(['1961-01-01', '1991-01-01'], dtype='datetime64[ns]', freq=None)`

### Environment

<details>

/home/roberto/miniconda3/envs/gs1/lib/python3.11/site-packages/_distutils_hack/__init__.py:33: UserWarning: Setuptools is replacing distutils.
  warnings.warn(""Setuptools is replacing distutils."")

INSTALLED VERSIONS
------------------
commit: None
python: 3.11.6 | packaged by conda-forge | (main, Oct  3 2023, 10:40:35) [GCC 12.3.0]
python-bits: 64
OS: Linux
OS-release: 6.5.0-14-generic
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: ('en_US', 'UTF-8')
libhdf5: 1.12.2
libnetcdf: 4.9.1

xarray: 2023.12.0
pandas: 2.1.4
numpy: 1.26.4
scipy: 1.12.0
netCDF4: 1.6.3
pydap: None
h5netcdf: 1.3.0
h5py: 3.8.0
Nio: 1.5.5
zarr: None
cftime: 1.6.3
nc_time_axis: None
iris: None
bottleneck: 1.3.5
dask: 2023.12.1
distributed: 2023.12.1
matplotlib: 3.8.2
cartopy: 0.22.0
seaborn: 0.13.0
numbagg: None
fsspec: 2023.12.2
cupy: None
pint: None
sparse: None
flox: None
numpy_groupies: None
setuptools: 68.2.2
pip: 23.3.2
conda: None
pytest: None
mypy: None
IPython: 8.20.0
sphinx: None

</details>
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