python / python/cpython

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

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extension-modules type-bug
Dominant language
Python
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Description

BPO 39804
Nosy @malemburg, @abalkin, @pganssle

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 2020-03-01.02:17:30.267>
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']

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reading the time module implementation and investigating how its timezone constants represent negative daylight-saving time, using Ireland as the example. The issue provides no file or test location, so first identify the relevant implementation and existing timezone tests; done means the constants accurately reflect this case without regressing other supported versions.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
operating-systems
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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