Plislit does not handle date timezone correctly

[jcbertin]

BPO	42401
Nosy	@ronaldoussoren, @ned-deily, @jcbertin
PRs	bpo-42401: Fix parsing and writing of the date timezone. #23384
Files	incorrect_timezone.py

^{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 = None
created_at = <Date 2020-11-19.00:48:03.144>
labels = ['OS-mac', 'type-bug', '3.8', '3.9', '3.10', '3.7', 'library']
title = 'Plislit does not handle date timezone correctly'
updated_at = <Date 2020-11-19.09:34:35.992>
user = 'https://github.com/jcbertin'

bugs.python.org fields:

activity = <Date 2020-11-19.09:34:35.992>
actor = 'ronaldoussoren'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)', 'macOS']
creation = <Date 2020-11-19.00:48:03.144>
creator = 'jcbertin'
dependencies = []
files = ['49607']
hgrepos = []
issue_num = 42401
keywords = ['patch']
message_count = 1.0
messages = ['381386']
nosy_count = 3.0
nosy_names = ['ronaldoussoren', 'ned.deily', 'jcbertin']
pr_nums = ['23384']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42401'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

[jcbertin]

The plistlib library does not write dates correctly due to its timezone naive date management.

For an example, see https://gist.github.com/jcbertin/fedc115ea8122bec9953aa11041294eb or file attached.

[ronaldoussoren]

This is a duplicate of #53502 (which was just fixed)