IMO it is a bug in systemd-timesyncd (see LP: #1880839) that it adjusts time backward automatically and thus this won't become a real issue until 2036.
-- 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/1905688 Title: systemd-timesyncd.service: Timed out waiting for reply from NTP server Status in systemd package in Ubuntu: New Bug description: systemd-timesyncd.service fails to correct time if the system time is later than February 7, 2036. Image: ubuntu-20.10-desktop-amd64.iso systemd: 246.6-1ubuntu1 $ timedatectl status Local time: Fri 2038-11-26 07:58:16 UTC Universal time: Fri 2038-11-26 07:58:16 UTC RTC time: Fri 2038-11-26 07:58:17 Time zone: Etc/UTC (UTC, +0000) System clock synchronized: no NTP service: active RTC in local TZ: no ubuntu@ubuntu:~$ sudo systemctl status systemd-timesyncd.service ● systemd-timesyncd.service - Network Time Synchronization Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: enabled) Active: active (running) since Fri 2038-11-26 07:36:55 UTC; 7min ago Docs: man:systemd-timesyncd.service(8) Main PID: 1257 (systemd-timesyn) Status: "Idle." Tasks: 2 (limit: 9283) Memory: 1.8M CGroup: /system.slice/systemd-timesyncd.service └─1257 /lib/systemd/systemd-timesyncd Nov 26 07:39:09 ubuntu systemd-timesyncd[1257]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com). Nov 26 07:39:19 ubuntu systemd-timesyncd[1257]: Timed out waiting for reply from 91.189.89.198:123 (ntp.ubuntu.com). Nov 26 07:40:34 ubuntu systemd-timesyncd[1257]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com). Nov 26 07:40:44 ubuntu systemd-timesyncd[1257]: Timed out waiting for reply from 91.189.89.199:123 (ntp.ubuntu.com). There is no issue with ntpdate: ubuntu@ubuntu:~$ sudo ntpdate -v ntp.ubuntu.com 26 Nov 08:16:21 ntpdate[8926]: ntpdate 4.2.8p12@1.3728-o (1) 26 Nov 08:16:30 ntpdate[8926]: step time server 91.189.91.157 offset -567993599.624839 sec ubuntu@ubuntu:~$ date Thu Nov 26 08:16:33 AM UTC 2020 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1905688/+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
