formatting broken in czech (and others?)

[wenottingham]

Using boost 1.66.0 (Fedora 28, if that matters)

#include <langinfo.h>
#include <iostream>
#include <boost/date_time/gregorian/gregorian.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/date_time/local_time/local_time.hpp>
#include <boost/regex.hpp>


int main(int argc, char **argv) {
    namespace pt = boost::posix_time;
    pt::ptime now = pt::second_clock::local_time();
    using Facet = boost::posix_time::time_facet;
    std::stringstream ss;
    char *fmt;

    setlocale(LC_ALL, "");
    fmt = nl_langinfo(D_FMT);

    auto output_facet(new Facet(fmt));
    ss.imbue(std::locale(std::locale(), output_facet));
    ss << now;
    std::cout << ss.str() << std::endl;
}

Compile and run.

[notting@nostromo: ~]$ g++ -Wall -o test_datetime test_datetime.c  -lboost_date_time
[notting@nostromo: ~]$ LANG=cs_CZ.UTF-8 ./test_datetime 
%-d.%-m.2018

boost is not working properly in the presence of the - modifier. It also appears to ignore the O and E modifiers (used in Persian and other languages), but those at least still substitute ascii numbers properly.

[jeking3]

Agree that the format specification you indicated is not supported. It is not documented as being supported in the format flags, so this would be an enhancement.