Boot Clock Randomization
The TimeSync page notes:
- Using Boot Clock Randomization, i.e. after boot, the clock is set randomly between 0 and 180 seconds into the past or future. This is useful to enforce the design goal, that the host clock and Whonix ™ clock should always slightly differ. It is also useful to obfuscate the clock when sdwdate itself is running, because naturally at this time, sdwdate hasn't finished.
- sdwdate runs after booting.
By randomly moving the system clock a few seconds (and nanseconds) in the past or future during boot, this enforces the design goal of a slightly different host clock and VM clock, even before secure time synchornization has succeeded. This prevents time-based fingerprinting and linkability issues, thereby improving anonymity and privacy. 
sudo journalctl -b --no-pager -u bootclockrandomization
Run the following command. Note:
- Qubes-Whonix: Use a StandaloneVM or a separate TemplateVM.
- Non-Qubes-Whonix: No extra steps are required.
sudo systemctl mask bootclockrandomization
Boot Clock Randomization will no longer occur after reboot.