| 1 | #include "boost/date_time/posix_time/posix_time.hpp"
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| 2 | #include "boost/date_time/local_time_adjustor.hpp"
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| 3 | #include "boost/date_time/c_local_time_adjustor.hpp"
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| 4 | #include <iostream>
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| 5 |
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| 6 | void convertUtcTime(const boost::posix_time::ptime& tUtc);
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| 7 | boost::posix_time::ptime utc_to_local_workaround(const boost::posix_time::ptime& t);
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| 8 |
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| 9 | int main()
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| 10 | {
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| 11 | using namespace boost::posix_time;
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| 12 | using namespace boost::gregorian;
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| 13 | typedef boost::date_time::c_local_adjustor<ptime> local_adj;
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| 14 |
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| 15 | const ptime tUtcGood(date(2038,Jan,19), hours(3));
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| 16 | const ptime tUtcBad (date(2038,Jan,19), hours(4));
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| 17 |
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| 18 | convertUtcTime(tUtcGood);
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| 19 | convertUtcTime(tUtcBad);
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| 20 |
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| 21 | return 0;
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| 22 | }
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| 23 |
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| 24 |
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| 25 | void convertUtcTime(const boost::posix_time::ptime& tUtc)
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| 26 | {
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| 27 | using namespace boost::posix_time;
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| 28 | using namespace boost::gregorian;
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| 29 | typedef boost::date_time::c_local_adjustor<ptime> local_adj;
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| 30 |
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| 31 | std::cout << "Converting UTC time " << to_simple_string(tUtc) << ". ";
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| 32 | boost::posix_time::ptime tLoc;
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| 33 | try
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| 34 | {
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| 35 | tLoc = local_adj::utc_to_local(tUtc);
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| 36 | }
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| 37 | catch (std::exception& e)
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| 38 | {
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| 39 | std::cout << "Ouch, year 2038 problem: " << e.what() << ". " << std::endl << "Applying bug fix... ";
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| 40 | tLoc = utc_to_local_workaround(tUtc);
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| 41 | }
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| 42 | std::cout << "Local time is " << to_simple_string(tLoc) << std::endl;
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| 43 | }
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| 44 |
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| 45 |
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| 46 | boost::posix_time::ptime utc_to_local_workaround(const boost::posix_time::ptime& t)
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| 47 | {
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| 48 | // This code is a modified, non-templated version of boost::date_time::c_local_adjustor<ptime>
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| 49 |
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| 50 | typedef boost::posix_time::ptime time_type;
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| 51 | typedef time_type::time_duration_type time_duration_type;
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| 52 | typedef time_type::date_type date_type;
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| 53 | typedef date_type::duration_type date_duration_type;
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| 54 |
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| 55 | date_type time_t_start_day(1970,1,1);
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| 56 | time_type time_t_start_time(time_t_start_day,time_duration_type(0,0,0));
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| 57 | if (t < time_t_start_time) {
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| 58 | boost::throw_exception(std::out_of_range("Cannot convert dates prior to Jan 1, 1970"));
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| 59 | BOOST_DATE_TIME_UNREACHABLE_EXPRESSION(return time_t_start_time); // should never reach
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| 60 | }
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| 61 | date_duration_type dd = t.date() - time_t_start_day;
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| 62 | time_duration_type td = t.time_of_day();
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| 63 |
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| 64 | // The bugfix, needing generalization:
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| 65 | std::time_t t2 = static_cast<__int64>(dd.days())*__int64(86400) + static_cast<__int64>(td.hours()*3600 + td.minutes()*60 + td.seconds());
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| 66 |
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| 67 | std::tm tms, *tms_ptr;
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| 68 | tms_ptr = boost::date_time::c_time::localtime(&t2, &tms);
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| 69 | date_type d(static_cast<unsigned short>(tms_ptr->tm_year + 1900),
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| 70 | static_cast<unsigned short>(tms_ptr->tm_mon + 1),
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| 71 | static_cast<unsigned short>(tms_ptr->tm_mday));
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| 72 | time_duration_type td2(tms_ptr->tm_hour,
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| 73 | tms_ptr->tm_min,
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| 74 | tms_ptr->tm_sec,
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| 75 | t.time_of_day().fractional_seconds());
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| 76 |
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| 77 | return time_type(d,td2);
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| 78 | }
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| 79 |
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| 80 |
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| 81 | /* Printout:
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| 82 |
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| 83 | Converting UTC time 2038-Jan-19 03:00:00. Local time is 2038-Jan-19 04:00:00
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| 84 | Converting UTC time 2038-Jan-19 04:00:00. Ouch, year 2038 problem: could not convert calendar time to local time.
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| 85 | Applying bug fix... Local time is 2038-Jan-19 05:00:00
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| 86 | */
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