cookielib/cookiejar cookies' Expires date parse fails with long month names

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-10-10.08:05:41.013>
labels = ['type-bug', 'library']
title = "cookielib/cookiejar cookies' Expires date parse fails with long month names"
updated_at = <Date 2020-04-06.23:11:22.487>
user = 'https://bugs.python.org/albmoral'

bugs.python.org fields:

activity = <Date 2020-04-06.23:11:22.487>
actor = 'lpopil'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-10-10.08:05:41.013>
creator = 'alb_moral'
dependencies = []
files = []
hgrepos = []
issue_num = 34951
keywords = ['patch']
message_count = 7.0
messages = ['327461', '327475', '327482', '327484', '327486', '327491', '365882']
nosy_count = 4.0
nosy_names = ['martin.panter', 'xtreak', 'alb_moral', 'lpopil']
pr_nums = ['19393']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34951'
versions = ['Python 2.7', 'Python 3.6']