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  • [X] I have confirmed this bug exists on the latest version of pandas.

  • [X] I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

# non-ISO
In [1]: to_datetime(['2020-01-01', dt.datetime(9999, 1, 1)], format='%Y-%d-%m', errors='coerce')
Out[1]: DatetimeIndex(['NaT', 'NaT'], dtype='datetime64[ns]', freq=None)

# ISO
In [2]: to_datetime(['2020-01-01', dt.datetime(9999, 1, 1)], format='%Y-%m-%d', errors='coerce')
Out[2]: DatetimeIndex(['2020-01-01', 'NaT'], dtype='datetime64[ns]', freq=None)

Issue Description

it shouldn't coerce all elements

Expected Behavior

Out[2]: DatetimeIndex(['2020-01-01', 'NaT'], dtype='datetime64[ns]', freq=None)

Installed Versions

INSTALLED VERSIONS ------------------ commit : 113bdb37694e2849a15c390fddd8f28986bf1863 python : 3.8.15.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 : 2.0.0.dev0+918.g113bdb3769 numpy : 1.23.5 pytz : 2022.6 dateutil : 2.8.2 setuptools : 65.5.1 pip : 22.3.1 Cython : 0.29.32 pytest : 7.2.0 hypothesis : 6.61.0 sphinx : 4.5.0 blosc : None feather : None xlsxwriter : 3.0.3 lxml.etree : 4.9.1 html5lib : 1.1 pymysql : 1.0.2 psycopg2 : 2.9.3 jinja2 : 3.1.2 IPython : 8.7.0 pandas_datareader: None bs4 : 4.11.1 bottleneck : 1.3.5 brotli : fastparquet : 2022.12.0 fsspec : 2021.11.0 gcsfs : 2021.11.0 matplotlib : 3.6.2 numba : 0.56.4 numexpr : 2.8.3 odfpy : None openpyxl : 3.0.10 pandas_gbq : None pyarrow : 9.0.0 pyreadstat : 1.2.0 pyxlsb : 1.0.10 s3fs : 2021.11.0 scipy : 1.9.3 snappy : sqlalchemy : 1.4.45 tables : 3.7.0 tabulate : 0.9.0 xarray : 2022.12.0 xlrd : 2.0.1 zstandard : 0.19.0 tzdata : None qtpy : None pyqt5 : None None

Comment From: ShisuiUzumaki

@MarcoGorelli Is it too complex? If not, I am interested. Could you guide me in resolving this bug?

Comment From: MarcoGorelli

Gonna be completely honest - based on #50225, I'd suggest you become a bit more familiar with git / github first. I'd suggest the first 3 chapters of https://git-scm.com/book/en/v2

Comment From: ShisuiUzumaki

Gonna be completely honest - based on #50225, I'd suggest you become a bit more familiar with git / github first. I'd suggest the first 3 chapters of https://git-scm.com/book/en/v2

Ok! Actually, I made a little mistake and that was I used git rebase main, not sure what I was thinking. The thing is most of these issues originated from that. Afterward, it just became a mess. Anyway, I will get work on my git skills Could you provide some resources to improve git skills beside the one you mentioned. Aside, from that, I would still like to try contributing, so if you think there are some easier issues that won't be too complicated, please let me know!