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- /* Demonstrate conversions between a local time and utc
- * Output:
- *
- * UTC <--> New York while DST is NOT active (5 hours)
- * 2001-Dec-31 19:00:00 in New York is 2002-Jan-01 00:00:00 UTC time
- * 2002-Jan-01 00:00:00 UTC is 2001-Dec-31 19:00:00 New York time
- *
- * UTC <--> New York while DST is active (4 hours)
- * 2002-May-31 20:00:00 in New York is 2002-Jun-01 00:00:00 UTC time
- * 2002-Jun-01 00:00:00 UTC is 2002-May-31 20:00:00 New York time
- *
- * UTC <--> Arizona (7 hours)
- * 2002-May-31 17:00:00 in Arizona is 2002-Jun-01 00:00:00 UTC time
- */
- #include "boost/date_time/posix_time/posix_time.hpp"
- #include "boost/date_time/local_time_adjustor.hpp"
- #include "boost/date_time/c_local_time_adjustor.hpp"
- #include <iostream>
- int
- main()
- {
- using namespace boost::posix_time;
- using namespace boost::gregorian;
- //This local adjustor depends on the machine TZ settings-- highly dangerous!
- typedef boost::date_time::c_local_adjustor<ptime> local_adj;
- ptime t10(date(2002,Jan,1), hours(7));
- ptime t11 = local_adj::utc_to_local(t10);
- std::cout << "UTC <--> Zone base on TZ setting" << std::endl;
- std::cout << to_simple_string(t11) << " in your TZ is "
- << to_simple_string(t10) << " UTC time "
- << std::endl;
- time_duration td = t11 - t10;
- std::cout << "A difference of: "
- << to_simple_string(td) << std::endl;
- //eastern timezone is utc-5
- typedef boost::date_time::local_adjustor<ptime, -5, us_dst> us_eastern;
- ptime t1(date(2001,Dec,31), hours(19)); //5 hours b/f midnight NY time
- std::cout << "\nUTC <--> New York while DST is NOT active (5 hours)"
- << std::endl;
- ptime t2 = us_eastern::local_to_utc(t1);
- std::cout << to_simple_string(t1) << " in New York is "
- << to_simple_string(t2) << " UTC time "
- << std::endl;
- ptime t3 = us_eastern::utc_to_local(t2);//back should be the same
- std::cout << to_simple_string(t2) << " UTC is "
- << to_simple_string(t3) << " New York time "
- << "\n\n";
- ptime t4(date(2002,May,31), hours(20)); //4 hours b/f midnight NY time
- std::cout << "UTC <--> New York while DST is active (4 hours)" << std::endl;
- ptime t5 = us_eastern::local_to_utc(t4);
- std::cout << to_simple_string(t4) << " in New York is "
- << to_simple_string(t5) << " UTC time "
- << std::endl;
- ptime t6 = us_eastern::utc_to_local(t5);//back should be the same
- std::cout << to_simple_string(t5) << " UTC is "
- << to_simple_string(t6) << " New York time "
- << "\n" << std::endl;
-
- //Arizona timezone is utc-7 with no dst
- typedef boost::date_time::local_adjustor<ptime, -7, no_dst> us_arizona;
- ptime t7(date(2002,May,31), hours(17));
- std::cout << "UTC <--> Arizona (7 hours)" << std::endl;
- ptime t8 = us_arizona::local_to_utc(t7);
- std::cout << to_simple_string(t7) << " in Arizona is "
- << to_simple_string(t8) << " UTC time "
- << std::endl;
- return 0;
- }
- /* Copyright 2001-2004: CrystalClear Software, Inc
- * http://www.crystalclearsoftware.com
- *
- * 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)
- */
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