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INITTODR(9) FreeBSD Kernel Developer's Manual INITTODR(9) NAME inittodr - initialize system time SYNOPSIS void inittodr(time_t base); DESCRIPTION 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 system, as given in base. Those heuristics include: o If the battery-backed clock has a valid time, it is used. o If the battery-backed clock does not have a valid time, and the time provided in base is within reason, base is used as the current time. o If the battery-backed clock appears invalid, and base appears nonsensical or was not provided (was given as zero), an arbitrary base (typically some time in the late 1970s) will be used. Once a system time has been determined, it is passed to the tc_setclock() function. DIAGNOSTICS The inittodr() function prints diagnostic messages if it has trouble figuring out the system time. Conditions that can cause diagnostic messages to be printed include: o The battery-backed clock's time appears nonsensical. o The base time appears nonsensical. o The base time and the battery-backed clock's time differ by a large amount. SEE ALSO microtime(9), resettodr(9) BUGS Each system's heuristics for picking the correct time are slightly different. FreeBSD 14.1-RELEASE-p8 June 26, 2020 FreeBSD 14.1-RELEASE-p8