// g++ -std=c++11 -o example.x -lboost_date_time main.cpp
#include <locale>
#include <boost/date_time/local_time/local_time.hpp>

using std::locale;
using boost::date_time::not_a_date_time;
using boost::gregorian::date;
using boost::posix_time::seconds;
using boost::posix_time::milliseconds;
using namespace boost::local_time;


std::string to_string(local_date_time dt, const locale& locale)
{
    std::ostringstream stream;
    stream.imbue(locale);
    stream << dt;
    return stream.str();
}


local_date_time to_local_date_time(const std::string& string, const locale& locale)
{
    local_date_time dt(not_a_date_time);

    std::istringstream stream(string);
    stream.imbue(locale);
    stream >> dt;

    return dt;
}


void test_symmetry(local_date_time time, const locale& locale)
{
    std::cout << "Original time, with default format: " << time << "\n";
    std::cout << "Original time, with our format: " << to_string(time, locale) << "\n";

    auto time2 = to_local_date_time(to_string(time, locale), locale);

    std::cout << "New time, with default format: " << time2 << "\n";
    std::cout << "New time, with our format: " << to_string(time2, locale) << "\n\n";
}


int main()
{
    const locale DOT_LOCALE(
        locale(
            locale::classic(),
            new local_time_facet("blabla %s")
        ),
        new local_time_input_facet("blabla %s")
    );

    struct comma_numpunct : std::numpunct<char>
    {
        char do_decimal_point() const override { return ','; }
    };
     
    const locale COMMA_LOCALE(
        DOT_LOCALE,
        new comma_numpunct()
    );

    const local_date_time TIME(
        date(min_date_time),
        seconds(1) + milliseconds(234),
        nullptr,
        local_date_time::NOT_DATE_TIME_ON_ERROR
    );

    test_symmetry(TIME, DOT_LOCALE);
    test_symmetry(TIME, COMMA_LOCALE);
    return 0;
}