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/Src/Dependencies/Boost/boost/date_time/c_local_time_adjustor.hpp

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 1#ifndef DATE_TIME_C_LOCAL_TIME_ADJUSTOR_HPP__
 2#define DATE_TIME_C_LOCAL_TIME_ADJUSTOR_HPP__
 3
 4/* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
 5 * Use, modification and distribution is subject to the 
 6 * Boost Software License, Version 1.0. (See accompanying
 7 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
 8 * Author: Jeff Garland, Bart Garst
 9 * $Date: 2008-11-13 06:37:53 +1100 (Thu, 13 Nov 2008) $
10 */
11
12/*! @file c_local_time_adjustor.hpp
13  Time adjustment calculations based on machine
14*/
15
16#include <stdexcept>
17#include <boost/throw_exception.hpp>
18#include <boost/date_time/compiler_config.hpp>
19#include <boost/date_time/c_time.hpp>
20
21namespace boost {
22namespace date_time {
23
24  //! Adjust to / from utc using the C API
25  /*! Warning!!! This class assumes that timezone settings of the
26   *  machine are correct.  This can be a very dangerous assumption.
27   */
28  template<class time_type>
29  class c_local_adjustor {
30  public:
31    typedef typename time_type::time_duration_type time_duration_type;
32    typedef typename time_type::date_type date_type;
33    typedef typename date_type::duration_type date_duration_type;
34    //! Convert a utc time to local time
35    static time_type utc_to_local(const time_type& t)
36    {
37      date_type time_t_start_day(1970,1,1);
38      time_type time_t_start_time(time_t_start_day,time_duration_type(0,0,0));
39      if (t < time_t_start_time) {
40        boost::throw_exception(std::out_of_range("Cannot convert dates prior to Jan 1, 1970"));
41        BOOST_DATE_TIME_UNREACHABLE_EXPRESSION(return time_t_start_time); // should never reach
42      }
43      date_duration_type dd = t.date() - time_t_start_day;
44      time_duration_type td = t.time_of_day();
45      std::time_t t2 = dd.days()*86400 + td.hours()*3600 + td.minutes()*60 + td.seconds();
46      std::tm tms, *tms_ptr;
47      tms_ptr = c_time::localtime(&t2, &tms);
48      date_type d(static_cast<unsigned short>(tms_ptr->tm_year + 1900),
49                  static_cast<unsigned short>(tms_ptr->tm_mon + 1),
50                  static_cast<unsigned short>(tms_ptr->tm_mday));
51      time_duration_type td2(tms_ptr->tm_hour,
52                             tms_ptr->tm_min,
53                             tms_ptr->tm_sec,
54                             t.time_of_day().fractional_seconds());
55      
56      return time_type(d,td2);
57    }
58  };
59
60
61
62} } //namespace date_time
63
64
65
66#endif