focal:

$ pull-lp-source systemd 245.4-4ubuntu3.4
...
$ stat -c '%y' systemd-245.4/NEWS
2020-04-01 13:23:42.000000000 -0400

$ lxc launch --vm ubuntu:focal lp1878969-f
...
$ lxc exec lp1878969-f systemctl disable systemd-timesyncd
Removed /etc/systemd/system/sysinit.target.wants/systemd-timesyncd.service.
Removed /etc/systemd/system/dbus-org.freedesktop.timesync1.service.

$ lxc stop lp1878969-f 
$ sudo date -s '1990-01-01'
Mon Jan  1 00:00:00 UTC 1990
$ lxc start lp1878969-f 
$ lxc console lp1878969-f
...
ubuntu@lp1878969-f:~$ dpkg -l systemd|grep systemd
ii  systemd        245.4-4ubuntu3.4 amd64        system and service manager
ubuntu@lp1878969-f:~$ date
Wed Apr  1 17:24:01 UTC 2020


>From https://launchpad.net/ubuntu/+source/systemd/245.4-4ubuntu3.5
" -- Ioanna Alifieraki <ioanna-maria.alifier...@canonical.com>  Tue, 23 Feb 
2021 00:18:57 +0000"

$ sudo date -s '1990-01-01'
Mon Jan  1 00:00:00 UTC 1990
$ lxc start lp1878969-f 
$ lxc console lp1878969-f
...
ubuntu@lp1878969-f:~$ systemctl status systemd-timesyncd.service --no-pager
● systemd-timesyncd.service - Network Time Synchronization
     Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; disabled; 
vendor preset: enabled)
     Active: inactive (dead)
       Docs: man:systemd-timesyncd.service(8)
ubuntu@lp1878969-f:~$ dpkg -l systemd|grep systemd
ii  systemd        245.4-4ubuntu3.5 amd64        system and service manager
ubuntu@lp1878969-f:~$ date
Tue Feb 23 00:19:42 UTC 2021

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1878969

Title:
  time-epoch never changes in SRUs

Status in ubuntu-core-initramfs:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  New
Status in systemd source package in Bionic:
  Fix Committed
Status in systemd source package in Focal:
  Fix Committed

Bug description:
  [Impact]

   * Systems without hwclock come up with a fixed time epoch which is not 
updated in SRUs
   * Ideally booting with a newer built of systemd should move time epoch to be 
at least when systemd was last built. For example to the value of 
SOURCE_DATE_EPOCH.

  [Test Case]

   * Boot without network NTP or hwclock
   * Observe that the epoch is the same as the time when NEWS entry in the 
systemd source code was last touched.
   * Boot newer update of systemd, observe that the time epoch is at least 2020

  [Regression Potential]

   * Bad epoch, may result in unable to perform TLS connections,
  validated GPG signatures, and snapd assertions. Changing epoch to be
  more recent is desired. Some machines may rely on the fact that
  "bionic" without hwclock always comes up in year 2018. But in practice
  that is incorrect thing to do.

  [Other Info]
   
   * By default

  option('time-epoch', type : 'integer', value : '-1',
         description : 'time epoch for time clients')

  in systemd is set to the modification time of the NEW entry
  time_epoch = run_command(stat, '-c', '%Y', NEWS).stdout().to_int()

  If available, it should be set to SOURCE_DATE_EPOCH=1585051767 value
  to be compliant with the https://reproducible-
  builds.org/docs/timestamps/ specification.

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