Use boost to get the time and format the method

Using boost to get the current time is convenient and quick, without considering cross-platform issues.

1. Output YYYYMMDD

#include <boost/date_time/gregorian/gregorian.hpp> 
#define BOOST_DATE_TIME_SOURCE 
   
std::string strTime = boost::gregorian::to_iso_string(\ 
boost::gregorian::day_clock::local_day()); 
   
std::cout << strTime.c_str() << std::endl;

2. Output YYYYMMDD - HH: MM: SS

#include <boost/date_time/posix_time/posix_time.hpp> 
#define BOOST_DATE_TIME_SOURCE 
   
std::string strTime = boost::posix_time::to_iso_string(\ 
boost::posix_time::second_clock::local_time()); 
   
//  At this time strTime The format of storage time is YYYYMMDDTHHMMSS Date and time in capital letters T Separated from the  
   
int pos = strTime.find('T'); 
strTime.replace(pos,1,std::string("-")); 
strTime.replace(pos + 3,0,std::string(":")); 
strTime.replace(pos + 6,0,std::string(":")); 
   
std::cout << strTime.c_str() << std::endl; 

3. Calculate the time interval. There are many powerful functions in boost for calculating time intervals, but I have listed only those I have used so far.

#include <boost/date_time/posix_time/posix_time.hpp> 
#include <boost/thread.hpp> 
#define BOOST_DATE_TIME_SOURCE 
 
boost::posix_time::ptime time_now,time_now1; 
boost::posix_time::millisec_posix_time_system_config::time_duration_type time_elapse; 
 
//  This is in microseconds ; You can put microsec_clock replace second_clock In seconds ; 
time_now = boost::posix_time::microsec_clock::universal_time(); 
 
// sleep 100 ms ; 
boost::this_thread::sleep(boost::posix_time::millisec(100)); 
 
time_now1 = boost::posix_time::microsec_clock::universal_time(); 
 
time_elapse = time_now1 - time_now; 
 
//  similar GetTickCount It's just that what you get over here is 2 A time of ticket The difference in microseconds ; 
int ticks = time_elapse.ticks(); 
 
//  You get the number of seconds between the two intervals ; 
int sec = time_elapse.total_seconds();