Ugly, not-to-be-pushed sucking in of all of Boost to get windows to work.
[dyninst.git] / external / boost / date_time / c_local_time_adjustor.hpp
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 or http://www.boost.org/LICENSE-1.0)
8  * Author: Jeff Garland, Bart Garst
9  * $Date: 2005/03/19 21:39:58 $
10  */
11
12 /*! @file c_local_time_adjustor.hpp
13   Time adjustment calculations based on machine
14 */
15
16 #include <stdexcept>
17 #include "boost/date_time/c_time.hpp"
18
19 namespace boost {
20 namespace date_time {
21
22   //! Adjust to / from utc using the C API
23   /*! Warning!!! This class assumes that timezone settings of the
24    *  machine are correct.  This can be a very dangerous assumption.
25    */
26   template<class time_type>
27   class c_local_adjustor {
28   public:
29     typedef typename time_type::time_duration_type time_duration_type;
30     typedef typename time_type::date_type date_type;
31     typedef typename date_type::duration_type date_duration_type;
32     //! Convert a utc time to local time
33     static time_type utc_to_local(const time_type& t)
34     {
35       date_type time_t_start_day(1970,1,1);
36       time_type time_t_start_time(time_t_start_day,time_duration_type(0,0,0));
37       if (t < time_t_start_time) {
38         throw std::out_of_range("Cannot convert dates prior to Jan 1, 1970");
39       }
40       date_duration_type dd = t.date() - time_t_start_day;
41       time_duration_type td = t.time_of_day();
42       std::time_t t2 = dd.days()*86400 + td.hours()*3600 + td.minutes()*60 + td.seconds();
43       std::tm tms, *tms_ptr;
44       tms_ptr = c_time::localtime(&t2, &tms);
45       //tms_ptr = std::localtime(&t2);
46       date_type d(static_cast<unsigned short>(tms_ptr->tm_year + 1900),
47                   static_cast<unsigned short>(tms_ptr->tm_mon + 1),
48                   static_cast<unsigned short>(tms_ptr->tm_mday));
49       time_duration_type td2(tms_ptr->tm_hour,
50                              tms_ptr->tm_min,
51                              tms_ptr->tm_sec,
52                              t.time_of_day().fractional_seconds());
53       
54       return time_type(d,td2);
55     }
56   };
57
58
59
60 } } //namespace date_time
61
62
63
64 #endif