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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
"../../../tools/boostbook/dtd/boostbook.dtd">
<!-- Copyright (c) 2001-2004 CrystalClear Software, Inc.
Subject to the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
-->
<section id="date_time.posix_time"
xmlns:xi="http://www.w3.org/2001/XInclude">
<title>Posix Time</title>
<bridgehead renderas="sect2">Posix Time System</bridgehead>
<para>
<link linkend="posix_intro">Introduction</link> --
<link linkend="posix_ex">Usage Examples</link>
</para>
<anchor id="posix_intro" />
<bridgehead renderas="sect3">Introduction</bridgehead>
<para>
Defines a non-adjusted time system with nano-second/micro-second resolution and stable calculation properties. The nano-second resolution option uses 96 bits of underlying storage for each ptime while the micro-second resolution uses 64 bits per ptime (see <link linkend="date_time.buildinfo">Build Options</link> for details). This time system uses the Gregorian calendar to implement the date portion of the time representation.
</para>
<anchor id="posix_ex" />
<bridgehead renderas="sect3">Usage Examples</bridgehead>
<para>
<informaltable frame="all">
<tgroup cols="2">
<thead>
<row>
<entry>Example</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><link linkend="date_time.examples.time_math">Time Math</link></entry>
<entry>A few simple calculations using ptime and time_durations.</entry>
</row>
<row>
<entry><link linkend="date_time.examples.print_hours">Print Hours</link></entry>
<entry>Retrieve time from clock, use a time_iterator.</entry>
</row>
<row>
<entry><link linkend="date_time.examples.local_utc_conversion">Local to UTC Conversion</link></entry>
<entry>Demonstrates a couple different ways to convert a local to UTC time including daylight savings rules.</entry>
</row>
<row>
<entry><link linkend="date_time.examples.time_periods">Time Periods</link></entry>
<entry>Some simple examples of intersection and display of time periods.</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
<xi:include href="ptime_class.xml" />
<xi:include href="time_duration.xml" />
<xi:include href="time_period.xml" />
<xi:include href="time_iterators.xml" />
<!-- includes here -->
</section>
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