Setting TZ for the complete script will not work as it will make strange behaviour if you are far away from UTC/GMT TZ. You can set it for just the date command that returns the epoch time.
I did a patch that does that for the bionic version. It also applys directly on Focal. I attach the patch to the bug. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. https://bugs.launchpad.net/bugs/1824088 Title: unattended upgrade ran one day after schedule Status in apt package in Ubuntu: Confirmed Bug description: I have noticed a strange behaviour in unattended upgrades. The host in question is scheduled to run upgrades on Mondays every second week. However, this week it ran upgrades on Tuesday instead (2019-04-09). This is the first time I’ve noticed this behaviour. I checked the logs in /var/log/apt/history.log* and I saw that worked as intended up until this week. Upgrades ran as expected on 2019-03-11 and 2019-03-25, which where both Mondays. The schedule was set with the line 'APT::Periodic::Unattended-Upgrade "14";' in the file /etc/apt/apt.conf.d/20auto-upgrades. Could it be daylight savings time that has caused skewing of the schedule? The server is located in Sweden and on 2019-03-31 we switched from CET to CEST. If the time diff is calculated with hours instead of calendar days passed, perhaps the missing hour on 2019-03-31 caused the scheduler to believe that on Monday 2019-03-08, two weeks (336 hours) had not yet passed. ADDITIONAL INFO Description: Ubuntu 16.04.6 LTS Release: 16.04 apt: Installed: 1.2.29ubuntu0.1 Candidate: 1.2.31 Version table: 1.2.31 500 500 http://se.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages *** 1.2.29ubuntu0.1 500 500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages 100 /var/lib/dpkg/status 1.2.10ubuntu1 500 500 http://se.archive.ubuntu.com/ubuntu xenial/main amd64 Packages unattended-upgrades: Installed: 0.90ubuntu0.10 Candidate: 0.90ubuntu0.10 Version table: *** 0.90ubuntu0.10 500 500 http://se.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages 500 http://se.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages 500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages 500 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages 100 /var/lib/dpkg/status 0.90 500 500 http://se.archive.ubuntu.com/ubuntu xenial/main amd64 Packages 500 http://se.archive.ubuntu.com/ubuntu xenial/main i386 Packages ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: apt 1.2.29ubuntu0.1 ProcVersionSignature: Ubuntu 4.4.0-142.168-generic 4.4.167 Uname: Linux 4.4.0-142-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.18 Architecture: amd64 Date: Wed Apr 10 09:06:49 2019 InstallationDate: Installed on 2017-12-28 (467 days ago) InstallationMedia: Ubuntu-Server 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801) SourcePackage: apt UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1824088/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
