id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
7868,chrono_io parses time incorrectly (1.53 and 1.52),Johan Lundberg <lundberj@…>,viboes,"streaming the result of 
  boost::chrono::system_clock::now()
into a stringstream, and back to a 
  boost::chrono::system_clock::time_point 
gives wrong results.


With boost 1.52 the error is exactly one second (when using the default formats)

With boost 1.53 beta (of today) the parsed times are semi-random around 1974.

With user-defined formats the error behaves a little differently:

In my example (attached) the time is correct up to the seconds, which are always parsed as 01 both with boost 1.52 and 1.53.

      cheers, Johan Lundberg

-------------
Full example:

{{{

#define BOOST_CHRONO_VERSION 2
#define BOOST_CHRONO_PROVIDES_DATE_IO_FOR_SYSTEM_CLOCK_TIME_POINT 1

#include <sstream>
#include <iostream>
#include <boost/chrono/chrono_io.hpp>
#include <boost/chrono/floor.hpp>
#include <boost/chrono/round.hpp>
#include <boost/chrono/ceil.hpp>

int main()
{
  using namespace boost;
  using namespace boost::chrono;
  boost::chrono::system_clock::time_point atnow= boost::chrono::system_clock::now();
  {
      std::stringstream strm;
      std::stringstream strm2;
      // does not change anything: strm<<time_fmt(boost::chrono::timezone::utc);
      // does not change anything: strm2<<time_fmt(boost::chrono::timezone::utc);
      boost::chrono::system_clock::time_point atnow2;
      strm<<atnow<<std::endl;
      std::cout << ""A:"" << strm.str()<< std::endl;
      strm>>atnow2;      
      strm2<<atnow2<<std::endl;
      std::cout << ""B:"" << strm2.str()<< std::endl;
      
      // 1 sec wrong:
      std::cout << ""diff:"" << boost::chrono::duration_cast<microseconds>(atnow2 - atnow).count() <<std::endl;
      std::stringstream formatted;
      formatted << time_fmt(boost::chrono::timezone::utc, ""%Y-%m-%d %H:%M:%S"");
      formatted << ""actual:""<< atnow <<std::endl;;
      formatted << ""parsed:""<< atnow2 <<std::endl;;
      std::cout << formatted.str();
  }

  {
      std::stringstream strm;
      std::stringstream strm2;
      boost::chrono::system_clock::time_point atnow2;
      // the final second mark is always parsed as 01
      strm<<time_fmt(boost::chrono::timezone::utc, ""%Y-%m-%d %H:%M:%S"");
      strm2<<time_fmt(boost::chrono::timezone::utc, ""%Y-%m-%d %H:%M:%S"");
      strm<<atnow<<std::endl;
      std::cout << ""actual:"" << strm.str()<< std::endl;
      strm>>atnow2;
      strm2<<atnow2<<std::endl;
      // the final second mark is always parsed as 01
      std::cout << ""parsed:"" << strm2.str()<< std::endl;
  }
}
}}}


--------------------------------------------
Details:

Compiled boost with gcc4.7.2 on Linux. I tried compiling boost both with and without cxxflags=-std=gnu++11, same result.

I also tried compiling my example with and without -std=c++11
",Bugs,closed,Boost 1.55.0,chrono,Boost 1.54.0,Regression,fixed,,