1 | #ifndef DATE_TIME_C_LOCAL_TIME_ADJUSTOR_HPP__
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2 | #define DATE_TIME_C_LOCAL_TIME_ADJUSTOR_HPP__
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3 |
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4 | /* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
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5 | * Use, modification and distribution is subject to the
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6 | * Boost Software License, Version 1.0. (See accompanying
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7 | * file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0)
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8 | * Author: Jeff Garland, Bart Garst
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9 | * $Date: 2005/03/19 21:39:58 $
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10 | */
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11 |
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12 | /*! @file c_local_time_adjustor.hpp
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13 | Time adjustment calculations based on machine
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14 | */
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15 |
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16 | #include <stdexcept>
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17 | #include "boost/date_time/c_time.hpp"
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18 |
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19 | namespace boost {
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20 | namespace date_time {
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21 |
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22 | //! Adjust to / from utc using the C API
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23 | /*! Warning!!! This class assumes that timezone settings of the
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24 | * machine are correct. This can be a very dangerous assumption.
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25 | */
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26 | template<class time_type>
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27 | class c_local_adjustor {
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28 | public:
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29 | typedef typename time_type::time_duration_type time_duration_type;
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30 | typedef typename time_type::date_type date_type;
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31 | typedef typename date_type::duration_type date_duration_type;
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32 | //! Convert a utc time to local time
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33 | static time_type utc_to_local(const time_type& t)
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34 | {
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35 | date_type time_t_start_day(1970,1,1);
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36 | time_type time_t_start_time(time_t_start_day,time_duration_type(0,0,0));
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37 | if (t < time_t_start_time) {
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38 | throw std::out_of_range("Cannot convert dates prior to Jan 1, 1970");
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39 | }
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40 | date_duration_type dd = t.date() - time_t_start_day;
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41 | time_duration_type td = t.time_of_day();
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42 | std::time_t t2 = dd.days()*86400 + td.hours()*3600 + td.minutes()*60 + td.seconds();
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43 | std::tm tms, *tms_ptr;
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44 | tms_ptr = c_time::localtime(&t2, &tms);
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45 | //tms_ptr = std::localtime(&t2);
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46 | date_type d(static_cast<unsigned short>(tms_ptr->tm_year + 1900),
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47 | static_cast<unsigned short>(tms_ptr->tm_mon + 1),
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48 | static_cast<unsigned short>(tms_ptr->tm_mday));
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49 | time_duration_type td2(tms_ptr->tm_hour,
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50 | tms_ptr->tm_min,
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51 | tms_ptr->tm_sec,
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52 | t.time_of_day().fractional_seconds());
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53 |
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54 | return time_type(d,td2);
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55 | }
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56 | };
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57 |
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58 |
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59 |
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60 | } } //namespace date_time
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61 |
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62 |
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63 |
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64 | #endif
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