# swegym / pandas-dev__pandas-53736

- taskset: [swegym](https://harnessreport.com/tasks/swegym.md)
- difficulty: hard
- category: debugging
- language: 
- runnable from the site: no
- agent timeout: 3000s

## Results by harness

_none yet_

## Instruction

```
BUG: resampling empty series loses time zone from dtype
### Pandas version checks

- [X] I have checked that this issue has not already been reported.

- [X] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsnew/index.html) of pandas.

- [ ] I have confirmed this bug exists on the [main branch](https://pandas.pydata.org/docs/dev/getting_started/install.html#installing-the-development-version-of-pandas) of pandas.


### Reproducible Example

```python
df = pd.DataFrame({
    'ts': [],
    'values': []
}).astype({'ts': 'datetime64[ns, Atlantic/Faroe]'})
df.resample('2MS', on='ts', closed='left', label='left', origin='start')['values'].sum().index
```


### Issue Description

this prints
```python
DatetimeIndex([], dtype='datetime64[ns]', name='ts', freq='2MS')
```

### Expected Behavior

```
DatetimeIndex([], dtype='datetime64[ns, Atlantic/Faroe]', name='ts', freq='2MS')
```

note that this works fine if the series isn't empty
```python
In [27]: df = pd.DataFrame({
    ...:     'ts': [datetime(2020, 1, 1)],
    ...:     'values': [10]
    ...: })
    ...: df['ts'] = df['ts'].dt.tz_localize('Atlantic/Faroe')
    ...: df.resample('2MS', on='ts', closed='left', label='left', origin='start')['values'].sum().index
Out[27]: DatetimeIndex(['2020-01-01 00:00:00+00:00'], dtype='datetime64[ns, Atlantic/Faroe]', name='ts', freq='2MS')
```

### Installed Versions

<details>

INSTALLED VERSIONS
------------------
commit           : 965ceca9fd796940050d6fc817707bba1c4f9bff
python           : 3.10.6.final.0
python-bits      : 64
OS               : Linux
OS-release       : 5.10.102.1-microsoft-standard-WSL2
Version          : #1 SMP Wed Mar 2 00:30:59 UTC 2022
machine          : x86_64
processor        : x86_64
byteorder        : little
LC_ALL           : None
LANG             : en_GB.UTF-8
LOCALE           : en_GB.UTF-8

pandas           : 2.0.2
numpy            : 1.24.3
pytz             : 2023.3
dateutil         : 2.8.2
setuptools       : 67.6.1
pip              : 23.0.1
Cython           : None
pytest           : 7.3.1
hypothesis       : None
sphinx           : None
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : None
html5lib         : None
pymysql          : None
psycopg2         : None
jinja2           : 3.1.2
IPython          : 8.13.2
pandas_datareader: None
bs4              : 4.12.2
bottleneck       : None
brotli           : None
fastparquet      : None
fsspec           : None
gcsfs            : None
matplotlib       : 3.7.1
numba            : None
numexpr          : None
odfpy            : None
openpyxl         : None
pandas_gbq       : None
pyarrow          : 12.0.0
pyreadstat       : None
pyxlsb           : None
s3fs             : None
scipy            : None
snappy           : None
sqlalchemy       : None
tables           : None
tabulate         : None
xarray           : None
xlrd             : None
zstandard        : None
tzdata           : 2023.3
qtpy             : None
pyqt5            : None

</details>
```
---
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