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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:15 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:15 -0400
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+<table class="head">
+ <tr>
+ <td class="head-ltitle">CLOCK(9)</td>
+ <td class="head-vol">Kernel Developer's Manual</td>
+ <td class="head-rtitle">CLOCK(9)</td>
+ </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">days_in_month</code>,
+ <code class="Nm">is_leap_year</code>, <code class="Nm">days_per_year</code>
+ &#x2014; <span class="Nd">handy time utilities</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp"><code class="In">#include
+ &lt;<a class="In">sys/clock.h</a>&gt;</code></p>
+<p class="Pp"><var class="Vt">#define SECS_PER_MINUTE 60</var>
+ <br/>
+ <var class="Vt">#define SECS_PER_HOUR 3600</var>
+ <br/>
+ <var class="Vt">#define SECS_PER_DAY 86400</var>
+ <br/>
+ <var class="Vt">#define DAYS_PER_COMMON_YEAR 365</var>
+ <br/>
+ <var class="Vt">#define DAYS_PER_LEAP_YEAR 366</var>
+ <br/>
+ <var class="Vt">#define SECS_PER_COMMON_YEAR (SECS_PER_DAY *
+ DAYS_PER_COMMON_YEAR)</var>
+ <br/>
+ <var class="Vt">#define SECS_PER_LEAP_YEAR (SECS_PER_DAY *
+ DAYS_PER_LEAP_YEAR)</var></p>
+<p class="Pp"><var class="Ft">static inline int</var>
+ <br/>
+ <code class="Fn">days_in_month</code>(<var class="Fa" style="white-space: nowrap;">int
+ m</var>);</p>
+<p class="Pp"><var class="Ft">static inline int</var>
+ <br/>
+ <code class="Fn">is_leap_year</code>(<var class="Fa" style="white-space: nowrap;">uint64_t
+ year</var>);</p>
+<p class="Pp"><var class="Ft">static inline int</var>
+ <br/>
+ <code class="Fn">days_per_year</code>(<var class="Fa" style="white-space: nowrap;">uint64_t
+ year</var>);</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="In">&lt;<a class="In">sys/clock.h</a>&gt;</code>
+ file provides handy time constants and <var class="Ft">static inline</var>
+ functions.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="FUNCTIONS"><a class="permalink" href="#FUNCTIONS">FUNCTIONS</a></h1>
+<p class="Pp">The
+ <a class="permalink" href="#days_in_month"><code class="Fn" id="days_in_month">days_in_month</code></a>()
+ function returns the number of days in the given month.
+ <code class="Fn">days_in_month</code>() assumes 28 days for February. If the
+ input value is out of the valid range (1-12) then the function returns
+ -1.</p>
+<p class="Pp" id="is_leap_year">The
+ <a class="permalink" href="#is_leap_year"><code class="Fn">is_leap_year</code></a>()
+ and
+ <a class="permalink" href="#days_per_year"><code class="Fn" id="days_per_year">days_per_year</code></a>()
+ functions take as the input parameter a value in the Gregorian year
+ format.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+ ALSO</a></h1>
+<p class="Pp"><a class="Xr">bintime(9)</a>, <a class="Xr">boottime(9)</a>,
+ <a class="Xr">time_second(9)</a>, <a class="Xr">time_uptime(9)</a>,
+ <a class="Xr">todr_gettime(9)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
+<p class="Pp">The <code class="In">&lt;<a class="In">sys/clock.h</a>&gt;</code>
+ header with handy utilities originated from
+ <code class="In">&lt;<a class="In">dev/clock_subr.h</a>&gt;</code>, which
+ originated from
+ <code class="In">&lt;<a class="In">arch/hp300/hp300/clock.c</a>&gt;</code>.</p>
+<p class="Pp">The
+ <code class="In">&lt;<a class="In">arch/hp300/hp300/clock.c</a>&gt;</code>
+ file first appeared in <span class="Ux">NetBSD 0.8</span> as a set of hp300
+ time-converting functions.
+ <code class="In">&lt;<a class="In">dev/clock_subr.h</a>&gt;</code> first
+ appeared in <span class="Ux">NetBSD 1.3</span> as a shared list of functions
+ to convert between &#x201C;year/month/day/hour/minute/second&#x201D; and
+ seconds since 1970 (&#x201C;POSIX time&#x201D;). The
+ <code class="In">&lt;<a class="In">sys/clock.h</a>&gt;</code> file first
+ appeared in <span class="Ux">NetBSD 8</span>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
+<p class="Pp"><span class="An">Kamil Rytarowski</span></p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">December 26, 2014</td>
+ <td class="foot-os">NetBSD 10.1</td>
+ </tr>
+</table>