[Bug 2132139] [NEW] Incorrect seconds value from "date +%s"

[Thierry Lelegard]

Public bug reported:

On Ubuntu 25.10, the command "date" from package "coreutils-from-uutils"
generates an incorrect value with format "+%s". There is a shift by one
hour.

Example:

~~~
$ date --version
date (uutils coreutils) 0.2.2
$
$ date -d "2020-06-13 05:00:00" +%s
1592020800
$
$ date -d @1592020800 '+%Y-%m-%d %H:%M:%S'
2020-06-13 06:00:00
~~~

We see that output date is one hour later than the input date, event
though the same seconds value was used.

On another older system:

~~~
$ date --version
date (GNU coreutils) 9.5
Copyright (C) 2024 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by David MacKenzie.
$
$ date -d "2020-06-13 05:00:00" +%s
1592017200
~~~

We see that the value from format "+%s" is 1592017200, 3600 seconds less
than 1592020800, as output on Ubuntu 25.10.

Impact: The test suite of a large project fails on Ubuntu 25.10 because
it contains shell scripts with date computation using this format. A
long time was lost, trying to find a bug in the project, while it was a
bug in that specific version of Ubuntu.

ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: coreutils-from-uutils 0.0.0~ubuntu24
ProcVersionSignature: Ubuntu 6.17.0-6.6-generic 6.17.1
Uname: Linux 6.17.0-6-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 21 18:22:25 2025
InstallationDate: Installed on 2022-06-22 (1248 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
PackageArchitecture: all
SourcePackage: coreutils-from
UpgradeStatus: Upgraded to questing on 2025-10-27 (25 days ago)

** Affects: coreutils-from (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug questing wayland-session

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https://bugs.launchpad.net/bugs/2132139

Title:
  Incorrect seconds value from "date +%s"

Status in coreutils-from package in Ubuntu:
  New

Bug description:
  On Ubuntu 25.10, the command "date" from package "coreutils-from-
  uutils" generates an incorrect value with format "+%s". There is a
  shift by one hour.

  Example:

  ~~~
  $ date --version
  date (uutils coreutils) 0.2.2
  $
  $ date -d "2020-06-13 05:00:00" +%s
  1592020800
  $
  $ date -d @1592020800 '+%Y-%m-%d %H:%M:%S'
  2020-06-13 06:00:00
  ~~~

  We see that output date is one hour later than the input date, event
  though the same seconds value was used.

  On another older system:

  ~~~
  $ date --version
  date (GNU coreutils) 9.5
  Copyright (C) 2024 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.

  Written by David MacKenzie.
  $
  $ date -d "2020-06-13 05:00:00" +%s
  1592017200
  ~~~

  We see that the value from format "+%s" is 1592017200, 3600 seconds
  less than 1592020800, as output on Ubuntu 25.10.

  Impact: The test suite of a large project fails on Ubuntu 25.10
  because it contains shell scripts with date computation using this
  format. A long time was lost, trying to find a bug in the project,
  while it was a bug in that specific version of Ubuntu.

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: coreutils-from-uutils 0.0.0~ubuntu24
  ProcVersionSignature: Ubuntu 6.17.0-6.6-generic 6.17.1
  Uname: Linux 6.17.0-6-generic x86_64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Nov 21 18:22:25 2025
  InstallationDate: Installed on 2022-06-22 (1248 days ago)
  InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
  PackageArchitecture: all
  SourcePackage: coreutils-from
  UpgradeStatus: Upgraded to questing on 2025-10-27 (25 days ago)

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