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Bug / regression: Unable to parse string '031' with 'DDDD' format using Pendulum 3.0.0 #797
Description
Context
- OS version and name: Debian GNU/Linux 11.8 64bits
- Python version: 3.9.2
- Pendulum version: 3.0.0
Issue
Pendulum 3 is unable to parse string '031' with 'DDDD' format:
>>> import pendulum
>>> pendulum.__version__
'3.0.0'
>>> p = pendulum.from_format(f"2023-031", 'YYYY-DDDD')
Traceback (most recent call last):
File "[..]/python3.9/site-packages/pendulum/__init__.py", line 284, in from_format
def duration(
File "[..]/python3.9/site-packages/pendulum/formatting/formatter.py", line 416, in parse
File "[..]/python3.9/site-packages/pendulum/formatting/formatter.py", line 482, in _check_parsed
"{}-{:>03d}".format(validated["year"], parsed["day_of_year"])
File "[..]/python3.9/site-packages/pendulum/parser.py", line 30, in parse
File "[..]/python3.9/site-packages/pendulum/parser.py", line 43, in _parse
return pendulum.now()
File "[..]/python3.9/site-packages/pendulum/parsing/__init__.py", line 78, in parse
"""
File "[..]/python3.9/site-packages/pendulum/parsing/__init__.py", line 125, in _parse
# so we fallback on the dateutil parser
pendulum.parsing.exceptions.ParserError: Unable to parse string [2023-031]
but it works for other values:
>>> p = pendulum.from_format(f"2023-030", 'YYYY-DDDD')
>>> p
DateTime(2023, 1, 30, 0, 0, 0, tzinfo=Timezone('UTC'))
>>> p = pendulum.from_format(f"2023-032", 'YYYY-DDDD')
>>> p
DateTime(2023, 2, 1, 0, 0, 0, tzinfo=Timezone('UTC'))
The bug does not seem to be present in the previous version of Pendulum :
>>> import pendulum
>>> pendulum.__version__
'2.1.2'
>>> p = pendulum.from_format(f"2023-031", 'YYYY-DDDD')
>>> p
DateTime(2023, 1, 31, 0, 0, 0, tzinfo=Timezone('UTC'))
Activity
simonpanay commentedon Jul 9, 2024
It seems that this bug appears for each day representing the last day of each month :
This bug appears when
pendulum._pendulum.parse_iso8601is called in https://github.com/sdispater/pendulum/blob/3.0.0/src/pendulum/parsing/__init__.py#L113It should return a Date object but instead raises a ValueError.
The error in probably located in https://github.com/sdispater/pendulum/blob/3.0.0/rust/src/parsing.rs#L212
As it is written in Rust, I can't go further in investigating why it's happening
simonpanay commentedon Jun 15, 2026
This issue has been fixed in pendulum 3.2.0 (#918)