Le 08/12/11 19:09, Ralf Globisch a écrit :
Hi,
I've run into a bit of a funny one and I'm not sure if I'm missing something or whether I've encountered a bug.
The following code excerpt *seems* to have 2 different results on windows 7 (VS2010) and linux (gcc4.6) using boost version 1.47.
#include<iostream> #include<cstdint> #include
int main(int argc, char** argv) { boost::chrono::duration<double> sec = boost::chrono::system_clock::now().time_since_epoch(); uint32_t uiSeconds = sec.count(); double dMinutes = uiSeconds/60.0; double dHours = dMinutes/60.0; double dDays = dHours/24.0; double dYears = dDays/365.0;
std::cout<< "Sec: "<< uiSeconds<< " Min: "<< dMinutes<< " Hours: "<< dHours<< " Days: "<< dDays<< " Years: "<< dYears<< std::endl;
return 0; }
This outputs the following: Linux: Sec: 1323362917 Min: 2.2056e+07 Hours: 367601 Days: 15316.7 Years: 41.9636
Windows: Sec: 82934819 Min: 1.38225e+006 Hours: 23037.4 Days: 959.894 Years: 2.62985
The linux results is the expected result: 1970 + 41 years = ~2011. Why does the windows result differ? I've run the windows version on two different windows machines with the same result.
Am I using the library incorrectly? I'm trying to obtain seconds since 1970 so that I can from there calculate seconds since 1900 to calculate an NTP timestamp.
Thanks for any help/suggestions! Hi,
time_since_epoch() gives the time since an undetermined epoch. I will use instead boost::chrono:time_system_clock::to_time_t which gives you the number of nanoseconds since 1970. std::time_t sec = boost::chrono:time_system_clock::to_time_t( boost::chrono::system_clock::now().time_since_epoch() ); Hth, Vicente