week_of_month in pendulum_parse for Timestamp '2021-01-15 14:00:00' returns -50

[vidyasagar86]

week_of_month in pendulum_parse for Timestamp '2021-01-15 14:00:00' returns -50

Sample code:
import pendulum

x='2021-01-15 14:00:00'
dt=pendulum.parse(x)
print(dt.week_of_month)

Output result -50

[anvit25]

I looked a bit into it. Seems like Jan 1 2021 is defined as 5th weekday of the 53rd week of 2020. And this is a "problem" with the datetime module.

[dmateusp]

This is an issue in 2023 as well

>>> pendulum.instance(datetime(2023, 1, 2, 0, 0)).week_of_month
-50

using pendulum==2.1.2

This library is used in Airflow so I imagine more people will encounter it

[pylead]

Using pendulum==2.1.2 confirm, the issue presents.

>>> import pendulum
>>> pendulum.DateTime(2023, 1, 2).week_of_month
-50