Parser returns None for "Sep 30 2025"

[d3QUone]

Version:

dateparser = "1.2.2"

How to reproduce:

import dateparser

dateparser.parse(date_string="Sep 30 2025")

dateparser.parse(date_string="Sep 30 2025", languages=["en"],)

dateparser.parse(date_string="Sep 30 2025", languages=["en"], region="US",)

For other months it works fine:

In [7]: dateparser.parse(date_string="Jan 30 2025")
Out[7]: datetime.datetime(2025, 1, 30, 0, 0)

[erindru]

I think I was just about to raise the same issue. This is a regression in 1.2.2 and I believe is related to distributing a pickle file for a timezone cache instead of allowing it to be built on the first run.

The maintainer deliberately requested the pickle file be included, which kind of defeats the purpose of a cache (it should be able to be built if it doesnt exist and also invalidated when the data becomes outdated).

You can identify the file by running:

$ find . -type f -name dateparser_tz_cache.pkl
./venv-dateparser-122/lib/python3.10/site-packages/dateparser/data/dateparser_tz_cache.pkl

If you delete that file from your env's site-packages, does the parsing start working again?

Steps to reproduce in a clean env for anyone interested:

working in dateparser==1.2.1

(returns datetime.datetime)

$ python -m venv venv-dateparser-121
$ . ./venv-dateparser-121/bin/activate
(venv-dateparser-121) $ pip install dateparser==1.2.1
(venv-dateparser-121) $ python
>>> import dateparser
>>> dateparser.parse("1 minute ago")
datetime.datetime(2025, 7, 30, 21, 1, 36, 710273)
>>> dateparser.parse("Sep 30 2025")
datetime.datetime(2025, 9, 30, 0, 0)

broken in dateparser==1.2.2

(returns None)

$ python -m venv venv-dateparser-122
$ . ./venv-dateparser-122/bin/activate
(venv-dateparser-121) $ pip install dateparser==1.2.2
(venv-dateparser-121) $ python
>>> import dateparser
>>> dateparser.parse("1 minute ago")
>>> dateparser.parse("Sep 30 2025")

[erindru]

Oh, I just noticed this related issue as well: #1281 (comment)

[serhii73]

In [4]: dateparser.__version__
Out[4]: '1.2.2'

In [5]: print(parse('1 minute ago'))
2025-08-08 14:12:03.525454

In [6]: dateparser.parse(date_string="Sep 30 2025")
Out[6]: datetime.datetime(2025, 9, 30, 0, 0)

In [7]: dateparser.parse(date_string="Sep 30 2025", languages=["en"],)
Out[7]: datetime.datetime(2025, 9, 30, 0, 0)

In [8]: dateparser.parse(date_string="Sep 30 2025", languages=["en"], region="US",)
Out[8]: datetime.datetime(2025, 9, 30, 0, 0)