Swatch Internet Time, https://en.wikipedia.org/wiki/Swatch_Internet_Time ("Swatch Internet Time (or beat time) is a decimal time concept introduced in 1998 by the Swatch corporation as part of their marketing campaign for their line of "Beat" watches.)
Some motherboards are made without real time clocks. The real time clock is omitted either out of the desire to save money (as in the Raspberry Pi system architecture) or because real time clocks may not be needed at all (as in the Arduino system architecture)."
Kernel timers: http://www.makelinux.net/ldd3/chp-7-sect-4 These timers are used to schedule execution of a function at a particular time in the future, based on the clock tick. A kernel timer is a data structure that instructs the kernel to execute a user-defined function with a user-defined argument at a user-defined time. The implementation resides in <linux/timer.h> and kernel/timer.c
Seasonal time for computers: hours are shorter in the winter, hours are longer in the summe
Networked Sundial Time Protocol (NSTP)
Imagine: Computers in a worldwide distributed network all calculate time based on their local sun positions; through a 'sundial'. This sundial can be technical: ntp + local positioning can calculate position of the sun for each day / season and adjust computer clocks to it. A protocol that negotiates time between local machines all counting in sundial time units.
The advantage in comparison to the NTP: The NTP bases itself on the no more master clock at the Atomic clock ensemble at the U.S. Naval Observatory. This protocol is basing itself on as many different sunpositions as there are computers in the network, favoring local and seasonal time experience above a universalist US controled centralised time. Side -effect is that computers no longer are in specific time zones, as the sundial protocol defines a time zone per computer location.
Linux log file viewers and analysers: - var/log/ -> contains system logs - Which and how to look at them: https://www.cyberciti.biz/faq/ubuntu-linux-gnome-system-log-viewer/ - start Gnome system log viewer on the comm: gnome-system-log & To analyse the booting-up: systemd-analyze / more detail on processes: systemd-analyze blame show it in a plot: systemd-analyze plot