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Please support CLOCK_TAI in the time module. #84198

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r-owen mannequin opened this issue Mar 19, 2020 · 3 comments
Closed

Please support CLOCK_TAI in the time module. #84198

r-owen mannequin opened this issue Mar 19, 2020 · 3 comments
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3.8 only security fixes stdlib Python modules in the Lib dir type-feature A feature request or enhancement

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@r-owen
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r-owen mannequin commented Mar 19, 2020

BPO 40017
Nosy @vstinner, @benjaminp, @r-owen
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  • bpo-40017: add CLOCK_TAI constant to the time module, if the constant is defined #19096
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    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 2020-03-24.03:41:46.925>
created_at = <Date 2020-03-19.19:14:59.079>
labels = ['3.8', 'type-feature', 'library']
title = 'Please support CLOCK_TAI in the time module.'
updated_at = <Date 2020-03-24.03:41:46.924>
user = 'https://github.com/r-owen'

    bugs.python.org fields:

    activity = <Date 2020-03-24.03:41:46.924>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2020-03-24.03:41:46.925>
closer = 'benjamin.peterson'
components = ['Library (Lib)']
creation = <Date 2020-03-19.19:14:59.079>
creator = 'r3owen'
dependencies = []
files = []
hgrepos = []
issue_num = 40017
keywords = ['patch']
message_count = 3.0
messages = ['364633', '364637', '364915']
nosy_count = 3.0
nosy_names = ['vstinner', 'benjamin.peterson', 'r3owen']
pr_nums = ['19096']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40017'
versions = ['Python 3.8']
    @r-owen
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    r-owen mannequin commented Mar 19, 2020

    It is becoming common (at least in astronomy) to want to use TAI as a time standard because it is a uniform time with no leap seconds, and differs from UTC (standard computer clock time) by an integer number of seconds that occasionally changes.

    Linux offers a clock for TAI time: CLOCK_TAI. It would be very helpful to have this constant in the time module, e.g. for calling time.clock_gettime

    Caveat: linux CLOCK_TAI will return UTC time if the leap second table has not been set up. Both ntp and ptp can be configured to maintain this table. So this is a caveat worth mentioning in the docs. But I hope it is not sufficient reason to deny the request.

    @r-owen r-owen mannequin added 3.8 only security fixes stdlib Python modules in the Lib dir type-feature A feature request or enhancement labels Mar 19, 2020
    @benjaminp
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    I think we could certainly take a patch to expose that constant if libc/kernel headers expose it.

    @benjaminp
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    New changeset 6000087 by Russell Owen in branch 'master':
    closes bpo-40017: Add CLOCK_TAI constant to the time module. (GH-19096)
    6000087

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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