timezone constants in time module inaccurate with negative DST (e.g. Ireland)

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-03-01.02:17:30.267>
labels = ['3.8', 'type-bug', '3.7', '3.9']
title = 'timezone constants in time module inaccurate with negative DST (e.g. Ireland)'
updated_at = <Date 2020-03-01.02:17:30.267>
user = 'https://github.com/pganssle'

bugs.python.org fields:

activity = <Date 2020-03-01.02:17:30.267>
actor = 'p-ganssle'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2020-03-01.02:17:30.267>
creator = 'p-ganssle'
dependencies = []
files = []
hgrepos = []
issue_num = 39804
keywords = []
message_count = 1.0
messages = ['363037']
nosy_count = 3.0
nosy_names = ['lemburg', 'belopolsky', 'p-ganssle']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39804'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9']