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+.\" $NetBSD: time_second.9,v 1.11 2024/09/07 19:13:29 rillig Exp $
+.\"
+.\" Copyright (c) 1994 Christopher G. Demetriou
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"          This product includes software developed for the
+.\"          NetBSD Project.  See https://www.NetBSD.org/ for
+.\"          information about NetBSD.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
+.\"
+.Dd July 16, 2023
+.Dt TIME_SECOND 9
+.Os
+.Sh NAME
+.Nm time_second ,
+.Nm time_uptime ,
+.Nm time_uptime32
+.Nd system time variables
+.Sh SYNOPSIS
+.In sys/time.h
+.Vt extern const time_t time_second;
+.Vt extern const time_t time_uptime;
+.Vt extern const uint32_t time_uptime32;
+.Sh DESCRIPTION
+The
+.Va time_second
+variable is the system's
+.Dq wall clock ,
+giving the number of seconds since midnight (0 hour),
+January 1, 1970, (proleptic) UTC,
+minus the number of leap seconds.
+It is set at boot by
+.Xr inittodr 9 ,
+and is updated periodically via
+.Xr timecounter 9
+framework, and also updated by the
+.Xr settimeofday 2
+system call.
+.Pp
+The
+.Va time_uptime
+variable is a monotonically increasing system clock.
+It is set at boot, and is updated periodically.
+(It is not updated by
+.Xr settimeofday 2 . )
+.Pp
+The
+.Va time_uptime32
+variable is the low-order 32 bits of
+.Va time_uptime ,
+which is cheaper to read on 32-bit platforms.
+.Pp
+You must only read the variables
+.Va time_second ,
+.Va time_uptime ,
+and
+.Va time_uptime32 ;
+you may not write to them or take their addresses.
+They may be implemented as macros.
+.Pp
+The
+.Xr bintime 9 ,
+.Xr getbintime 9 ,
+.Xr microtime 9 ,
+.Xr getmicrotime 9 ,
+.Xr nanotime 9 ,
+and
+.Xr getnanotime 9
+functions can be used to get the current time more accurately and in an
+atomic manner.
+.Pp
+Similarly, the
+.Xr binuptime 9 ,
+.Xr getbinuptime 9 ,
+.Xr microuptime 9 ,
+.Xr getmicrouptime 9 ,
+.Xr nanouptime 9 ,
+and
+.Xr getnanouptime 9
+functions can be used to get the time elapsed since boot more accurately
+and in an atomic manner.
+.Sh SEE ALSO
+.Xr clock_settime 2 ,
+.Xr ntp_adjtime 2 ,
+.Xr timespec 3 ,
+.Xr hardclock 9 ,
+.Xr hz 9