author | Simon Howkins <simonh@symbian.org> |
Thu, 28 Oct 2010 12:05:33 +0100 | |
branch | RCL_3 |
changeset 78 | 5b3c983434ca |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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#ifndef DATE_TIME_C_LOCAL_TIME_ADJUSTOR_HPP__ |
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#define DATE_TIME_C_LOCAL_TIME_ADJUSTOR_HPP__ |
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/* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc. |
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* Use, modification and distribution is subject to the |
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* Boost Software License, Version 1.0. (See accompanying |
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* file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0) |
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* Author: Jeff Garland, Bart Garst |
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* $Date: 2005/03/19 21:39:58 $ |
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*/ |
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/*! @file c_local_time_adjustor.hpp |
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Time adjustment calculations based on machine |
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*/ |
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#include <stdexcept> |
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#include "boost/date_time/c_time.hpp" |
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namespace boost { |
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namespace date_time { |
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//! Adjust to / from utc using the C API |
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/*! Warning!!! This class assumes that timezone settings of the |
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* machine are correct. This can be a very dangerous assumption. |
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*/ |
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template<class time_type> |
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class c_local_adjustor { |
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public: |
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typedef typename time_type::time_duration_type time_duration_type; |
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typedef typename time_type::date_type date_type; |
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typedef typename date_type::duration_type date_duration_type; |
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//! Convert a utc time to local time |
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static time_type utc_to_local(const time_type& t) |
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{ |
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date_type time_t_start_day(1970,1,1); |
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time_type time_t_start_time(time_t_start_day,time_duration_type(0,0,0)); |
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if (t < time_t_start_time) { |
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throw std::out_of_range("Cannot convert dates prior to Jan 1, 1970"); |
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} |
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date_duration_type dd = t.date() - time_t_start_day; |
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time_duration_type td = t.time_of_day(); |
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std::time_t t2 = dd.days()*86400 + td.hours()*3600 + td.minutes()*60 + td.seconds(); |
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std::tm tms, *tms_ptr; |
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tms_ptr = c_time::localtime(&t2, &tms); |
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//tms_ptr = std::localtime(&t2); |
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date_type d(static_cast<unsigned short>(tms_ptr->tm_year + 1900), |
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static_cast<unsigned short>(tms_ptr->tm_mon + 1), |
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static_cast<unsigned short>(tms_ptr->tm_mday)); |
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time_duration_type td2(tms_ptr->tm_hour, |
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tms_ptr->tm_min, |
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tms_ptr->tm_sec, |
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t.time_of_day().fractional_seconds()); |
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return time_type(d,td2); |
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} |
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}; |
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} } //namespace date_time |
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#endif |