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66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
/* A simple example for using a time_zone and a posix_time_zone.
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*/
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#include "boost/date_time/local_time/local_time.hpp"
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#include <iostream>
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int
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main()
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{
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using namespace boost;
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using namespace local_time;
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using namespace gregorian;
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using posix_time::time_duration;
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/***** time_zone *****/
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// create the dependent objects for a time_zone
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time_zone_names tzn("Eastern Standard Time", "EST",
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"Eastern Daylight Time", "EDT");
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time_duration utc_offset(-5,0,0);
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dst_adjustment_offsets adj_offsets(time_duration(1,0,0),
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time_duration(2,0,0),
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time_duration(2,0,0));
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// rules for this zone are:
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// start on first Sunday of April at 2 am
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// end on last Sunday of October at 2 am
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// so we use a first_last_dst_rule
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first_day_of_the_week_in_month start_rule(Sunday, Apr);
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last_day_of_the_week_in_month end_rule(Sunday, Oct);
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shared_ptr<dst_calc_rule> nyc_rules(new first_last_dst_rule(start_rule,
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end_rule));
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// create the time_zone
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time_zone_ptr nyc_1(new time_zone(tzn, utc_offset, adj_offsets, nyc_rules));
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/***** posix_time_zone *****/
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// create a posix_time_zone that is the duplicate of the
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// time_zone created above. See posix_time_zone documentation
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// for details on full zone names
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std::string nyc_string;
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nyc_string = "EST-05:00:00EDT+01:00:00,M4.1.0/02:00:00,M10.5.0/02:00:00";
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// nyc_string = "EST-05EDT,M4.1.0,M10.5.0"; // shorter when defaults used
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time_zone_ptr nyc_2(new posix_time_zone(nyc_string));
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/***** show the two are equal *****/
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std::cout << "The first zone is in daylight savings from:\n "
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<< nyc_1->dst_local_start_time(2004) << " through "
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<< nyc_1->dst_local_end_time(2004) << std::endl;
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std::cout << "The second zone is in daylight savings from:\n "
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<< nyc_2->dst_local_start_time(2004) << " through "
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<< nyc_2->dst_local_end_time(2004) << std::endl;
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return 0;
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}
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/* Copyright 2001-2005: CrystalClear Software, Inc
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* http://www.crystalclearsoftware.com
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*
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* Subject to the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0)
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*/
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