9b5d99078e
[SVN r43422]
101 lines
3.8 KiB
XML
101 lines
3.8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
|
|
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
|
"../../../tools/boostbook/dtd/boostbook.dtd">
|
|
|
|
<!-- Copyright (c) 2001-2005 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.examples.simple_time_zone">
|
|
<title>Simple Time Zones</title>
|
|
|
|
<para>
|
|
Example usage of custom_time_zone as well as posix_time_zone.
|
|
</para>
|
|
<programlisting>
|
|
<![CDATA[
|
|
/* A simple example for using a custom_time_zone and a posix_time_zone.
|
|
*/
|
|
|
|
#include "boost/date_time/local_time/local_time.hpp"
|
|
#include <iostream>
|
|
|
|
int
|
|
main()
|
|
{
|
|
using namespace boost;
|
|
using namespace local_time;
|
|
using namespace gregorian;
|
|
using posix_time::time_duration;
|
|
|
|
/***** custom_time_zone *****/
|
|
|
|
// create the dependent objects for a custom_time_zone
|
|
time_zone_names tzn("Eastern Standard Time", "EST",
|
|
"Eastern Daylight Time", "EDT");
|
|
time_duration utc_offset(-5,0,0);
|
|
dst_adjustment_offsets adj_offsets(time_duration(1,0,0),
|
|
time_duration(2,0,0),
|
|
time_duration(2,0,0));
|
|
// rules for this zone are:
|
|
// start on first Sunday of April at 2 am
|
|
// end on last Sunday of October at 2 am
|
|
// so we use a first_last_dst_rule
|
|
first_day_of_the_week_in_month start_rule(Sunday, Apr);
|
|
last_day_of_the_week_in_month end_rule(Sunday, Oct);
|
|
shared_ptr<dst_calc_rule> nyc_rules(new first_last_dst_rule(start_rule,
|
|
end_rule));
|
|
// create more dependent objects for a non-dst custom_time_zone
|
|
time_zone_names tzn2("Mountain Standard Time", "MST",
|
|
"", ""); // no dst means empty dst strings
|
|
time_duration utc_offset2(-7,0,0);
|
|
dst_adjustment_offsets adj_offsets2(time_duration(0,0,0),
|
|
time_duration(0,0,0),
|
|
time_duration(0,0,0));
|
|
// no dst means we need a null pointer to the rules
|
|
shared_ptr<dst_calc_rule> phx_rules;
|
|
|
|
// create the custom_time_zones
|
|
time_zone_ptr nyc_1(new custom_time_zone(tzn, utc_offset,
|
|
adj_offsets, nyc_rules));
|
|
time_zone_ptr phx_1(new custom_time_zone(tzn2, utc_offset2,
|
|
adj_offsets2, phx_rules));
|
|
|
|
/***** posix_time_zone *****/
|
|
|
|
// create posix_time_zones that are the duplicates of the
|
|
// custom_time_zones created above. See posix_time_zone documentation
|
|
// for details on full zone names.
|
|
std::string nyc_string, phx_string;
|
|
nyc_string = "EST-05:00:00EDT+01:00:00,M4.1.0/02:00:00,M10.5.0/02:00:00";
|
|
// nyc_string = "EST-05EDT,M4.1.0,M10.5.0"; // shorter when defaults used
|
|
phx_string = "MST-07"; // no-dst
|
|
time_zone_ptr nyc_2(new posix_time_zone(nyc_string));
|
|
time_zone_ptr phx_2(new posix_time_zone(phx_string));
|
|
|
|
|
|
/***** show the sets are equal *****/
|
|
|
|
std::cout << "The first zone is in daylight savings from:\n "
|
|
<< nyc_1->dst_local_start_time(2004) << " through "
|
|
<< nyc_1->dst_local_end_time(2004) << std::endl;
|
|
|
|
std::cout << "The second zone is in daylight savings from:\n "
|
|
<< nyc_2->dst_local_start_time(2004) << " through "
|
|
<< nyc_2->dst_local_end_time(2004) << std::endl;
|
|
|
|
std::cout << "The third zone (no daylight savings):\n "
|
|
<< phx_1->std_zone_abbrev() << " and "
|
|
<< phx_1->base_utc_offset() << std::endl;
|
|
|
|
std::cout << "The fourth zone (no daylight savings):\n "
|
|
<< phx_2->std_zone_abbrev() << " and "
|
|
<< phx_2->base_utc_offset() << std::endl;
|
|
|
|
return 0;
|
|
}
|
|
]]>
|
|
</programlisting>
|
|
</section>
|