INITTODR(9)            NetBSD Kernel Developer's Manual            INITTODR(9)

inittodr -- initialize system time
void inittodr(time_t base);
The inittodr() function determines the time and sets the system clock. It tries to pick the correct time using a set of heuristics that examine the system's battery-backed clock and the time reported by the file sys- tem, as given in base. Those heuristics include: If the battery-backed clock has a valid time, and is not signifi- cantly behind the time provided by base, it is used. If the battery-backed clock does not have a valid time, or is signif- icantly behind the time provided in base, and the time provided in base is within reason, base is used as the current time. If the battery-backed clock appears invalid, and base appears non- sensical or was not provided (was given as zero), an arbitrary base (typically some time within the same year that the kernel was last updated) will be used. Once a system time has been determined, it is stored in the time vari- able.
The inittodr() function prints diagnostic messages if it has trouble fig- uring out the system time. Conditions that can cause diagnostic messages to be printed include: There is no battery-backed clock present on the system. The battery-backed clock's time appears nonsensical. The base time appears nonsensical. The base time and the battery-backed clock's time differ by a large amount.
clock_ymdhms_to_secs(9), resettodr(9), time_second(9)
Some systems use heuristics for picking the correct time that are slightly different. NetBSD 5.0 September 6, 2006 NetBSD 5.0

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