Wrong values for %b and %B in ca_ES and ca_AD locales

[aseques]

BPO	38220
Nosy	@eryksun

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-09-19.05:27:39.350>
created_at = <Date 2019-09-18.21:03:06.324>
labels = ['3.7', 'type-bug', 'library']
title = 'Wrong values for %b and %B in ca_ES and ca_AD locales'
updated_at = <Date 2019-09-19.05:27:39.340>
user = 'https://bugs.python.org/aseques'

bugs.python.org fields:

activity = <Date 2019-09-19.05:27:39.340>
actor = 'eryksun'
assignee = 'none'
closed = True
closed_date = <Date 2019-09-19.05:27:39.350>
closer = 'eryksun'
components = ['Library (Lib)']
creation = <Date 2019-09-18.21:03:06.324>
creator = 'aseques'
dependencies = []
files = []
hgrepos = []
issue_num = 38220
keywords = []
message_count = 3.0
messages = ['352755', '352756', '352767']
nosy_count = 2.0
nosy_names = ['eryksun', 'aseques']
pr_nums = []
priority = 'normal'
resolution = 'third party'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38220'
versions = ['Python 3.7']

[aseques]

There's an incorrect behaviour in the output for the strftime values when in catalan.
On the documentation at https://docs.python.org/3.7/library/datetime.html#strftime-strptime-behavior:

• %b Month as locale’s abbreviated name. Jan, Feb, …, Dec (en_US)
• %B Month as locale’s full name. January, February, …, December (en_US);

It works also in es_ES an others, while in catalan there's an extra article on the month name (and a point in the abbreviated version) that shouldn't be there de "set." and "de setembre".

Where should I go to fix this and get the documented behaviour? I haven't been able to find a translation section on python site.

[aseques]

Issue can be reproduced with this snippet:
---

import locale
from datetime import datetime
locale.setlocale(locale.LC_ALL, 'ca_AD.utf8')
locale.setlocale(locale.LC_ALL, 'ca_ES.utf8')
#locale.setlocale(locale.LC_ALL, 'es_ES.utf8')
now = datetime.now() # current date and time
date_time = now.strftime("|%b|%B|")
print("date and time:",date_time)

---

[eryksun]

The result from strftime is platform dependent. In Windows, the result has a trailing "." for the abbreviated names that are less than four characters, but no "de" in either form:

    >>> months = [(2019, m) + (0,)*7 for m in range(1,13)]
    >>> locale.setlocale(locale.LC_ALL, 'ca_ES.utf8')
    'ca_ES.utf8'
    >>> print(*(time.strftime('%b|%B', m) for m in months), sep='\n')
    gen.|gener
    febr.|febrer
    març|març
    abr.|abril
    maig|maig
    juny|juny
    jul.|juliol
    ag.|agost
    set.|setembre
    oct.|octubre
    nov.|novembre
    des.|desembre

In Linux, the result uses the same base abbreviations as in Windows, including the trailing ".", but it also includes "de" or "d'" in both forms:

    >>> months = [(2019, m) + (0,)*7 for m in range(1,13)]
    >>> locale.setlocale(locale.LC_ALL, 'ca_ES.utf8')
    'ca_ES.utf8'
    >>> print(*(time.strftime('%b|%B', m) for m in months), sep='\n')
    de gen.|de gener
    de febr.|de febrer
    de març|de març
    d’abr.|d’abril
    de maig|de maig
    de juny|de juny
    de jul.|de juliol
    d’ag.|d’agost
    de set.|de setembre
    d’oct.|d’octubre
    de nov.|de novembre
    de des.|de desembre