I want to calculate the time difference between local_date_time objects that I
initialized using two different time zones:
#include <iostream>
#include
#include // TZ database
int main(int argc, char* argv[])
{
using namespace boost::posix_time;
using namespace boost::local_time;
tz_database tz_db;
try {
tz_db.load_from_file("tz.csv");
} catch( data_not_accessible& e ) {
std::cerr << "Error with time zone data file: " << e.what() << std::endl;
exit(EXIT_FAILURE);
} catch( bad_field_count& e ) {
std::cerr << "Error with time zone data file: " << e.what() << std::endl;
exit(EXIT_FAILURE);
}
time_zone_ptr tzp_nyc = tz_db.time_zone_from_region("America/New_York");
time_zone_ptr tzp_rome = tz_db.time_zone_from_region("Europe/Rome");
local_date_time nyc_time(second_clock::universal_time(), tzp_nyc);
std::cout << "Current time in NY is " <<
to_simple_string(nyc_time.local_time()) << std::endl;
local_date_time rome_time(second_clock::universal_time(), tzp_rome);
std::cout << "Current time in Rome is " <<
to_simple_string(rome_time.local_time()) << std::endl;
local_time_period tdiff(nyc_time, rome_time);
std::cout << "Difference between time zones: " << tdiff.length() <<
std::endl;
return 0;
}
tdiff.lenth() returns 00:00:00. Why the function can't return the difference
between the two local times?
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