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+.\"     $NetBSD: clock.9,v 1.2 2014/12/26 14:15:18 wiz Exp $
+.\"
+.\" Copyright (c) 2014 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is contributed to The NetBSD Foundation by Kamil Rytarowski
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``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 FOUNDATION OR CONTRIBUTORS
+.\" 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.
+.\"
+.Dd December 26, 2014
+.Dt CLOCK 9
+.Os
+.Sh NAME
+.Nm days_in_month ,
+.Nm is_leap_year ,
+.Nm days_per_year
+.Nd handy time utilities
+.Sh SYNOPSIS
+.In sys/clock.h
+.Vt #define SECS_PER_MINUTE         60
+.Vt #define SECS_PER_HOUR           3600
+.Vt #define SECS_PER_DAY            86400
+.Vt #define DAYS_PER_COMMON_YEAR    365
+.Vt #define DAYS_PER_LEAP_YEAR      366
+.Vt #define SECS_PER_COMMON_YEAR    (SECS_PER_DAY * DAYS_PER_COMMON_YEAR)
+.Vt #define SECS_PER_LEAP_YEAR      (SECS_PER_DAY * DAYS_PER_LEAP_YEAR)
+.Ft static inline int
+.Fn days_in_month "int m"
+.Ft static inline int
+.Fn is_leap_year "uint64_t year"
+.Ft static inline int
+.Fn days_per_year "uint64_t year"
+.Sh DESCRIPTION
+The
+.In sys/clock.h
+file provides handy time constants and
+.Ft static inline
+functions.
+.Sh FUNCTIONS
+The
+.Fn days_in_month
+function returns the number of days in the given month.
+.Fn days_in_month
+assumes 28 days for February.
+If the input value is out of the valid range (1-12) then the function returns
+\-1.
+.Pp
+The
+.Fn is_leap_year
+and
+.Fn days_per_year
+functions take as the input parameter a value in the Gregorian year format.
+.Sh SEE ALSO
+.Xr bintime 9 ,
+.Xr boottime 9 ,
+.Xr time_second 9 ,
+.Xr time_uptime 9 ,
+.Xr todr_gettime 9
+.Sh HISTORY
+The
+.In sys/clock.h
+header with handy utilities originated from
+.In dev/clock_subr.h ,
+which originated from
+.In arch/hp300/hp300/clock.c .
+.Pp
+The
+.In arch/hp300/hp300/clock.c
+file first appeared in
+.Nx 0.8
+as a set of hp300 time-converting functions.
+.In dev/clock_subr.h
+first appeared in
+.Nx 1.3
+as a shared list of functions to convert between
+.Dq year/month/day/hour/minute/second
+and seconds since 1970
+.Pq Dq POSIX time .
+The
+.In sys/clock.h
+file first appeared in
+.Nx 8 .
+.Sh AUTHORS
+.An Kamil Rytarowski