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TIME_SECOND(9) NetBSD Kernel Developer's Manual TIME_SECOND(9)
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time_second, time_uptime -- system time variables
extern time_t time_second;
extern time_t time_uptime;
The time_second variable is the system's ``wall time'' clock. It is set
at boot by inittodr(9), and is updated periodically via timecounter(9)
framework, and also updated by the settimeofday(2) system call.
The time_uptime variable is a monotonically increasing system clock. It
is set at boot, and is updated periodically. (It is not updated by
All of these variables contain times expressed in seconds since midnight
(0 hour), January 1, 1970, UTC.
The bintime(9), getbintime(9), microtime(9), getmicrotime(9),
nanotime(9), and getnanotime(9) functions can be used to get the current
time more accurately and in an atomic manner.
Similarly, the binuptime(9), getbinuptime(9), microuptime(9),
getmicrouptime(9), nanouptime(9), and getnanouptime(9) functions can be
used to get the time elapsed since boot more accurately and in an atomic
clock_settime(2), ntp_adjtime(2), timespec(3), hardclock(9), hz(9)
NetBSD 9.99 April 17, 2020 NetBSD 9.99
Modified for NetBSD
by Kimmo Suominen